2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@suse.cz>
5 * Takashi Iwai <tiwai@suse.de>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <sound/driver.h>
25 #include <linux/init.h>
26 #include <linux/smp_lock.h>
27 #include <linux/slab.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <linux/kmod.h>
32 #include <sound/seq_kernel.h>
33 #include "seq_clientmgr.h"
34 #include "seq_memory.h"
35 #include "seq_queue.h"
36 #include "seq_timer.h"
38 #include "seq_system.h"
39 #include <sound/seq_device.h>
41 #include <linux/compat.h>
46 * this module handles the connections of userland and kernel clients
50 #define SNDRV_SEQ_LFLG_INPUT 0x0001
51 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
52 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
54 static DEFINE_SPINLOCK(clients_lock);
55 static DECLARE_MUTEX(register_mutex);
60 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
61 static client_t *clienttab[SNDRV_SEQ_MAX_CLIENTS];
62 static usage_t client_usage;
67 static int bounce_error_event(client_t *client, snd_seq_event_t *event, int err, int atomic, int hop);
68 static int snd_seq_deliver_single_event(client_t *client, snd_seq_event_t *event, int filter, int atomic, int hop);
73 static inline mm_segment_t snd_enter_user(void)
75 mm_segment_t fs = get_fs();
80 static inline void snd_leave_user(mm_segment_t fs)
87 static inline unsigned short snd_seq_file_flags(struct file *file)
89 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
91 return SNDRV_SEQ_LFLG_OUTPUT;
93 return SNDRV_SEQ_LFLG_INPUT;
95 return SNDRV_SEQ_LFLG_OPEN;
99 static inline int snd_seq_write_pool_allocated(client_t *client)
101 return snd_seq_total_cells(client->pool) > 0;
104 /* return pointer to client structure for specified id */
105 static client_t *clientptr(int clientid)
107 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
108 snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid);
111 return clienttab[clientid];
114 extern int seq_client_load[];
116 client_t *snd_seq_client_use_ptr(int clientid)
121 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
122 snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid);
125 spin_lock_irqsave(&clients_lock, flags);
126 client = clientptr(clientid);
129 if (clienttablock[clientid]) {
130 spin_unlock_irqrestore(&clients_lock, flags);
133 spin_unlock_irqrestore(&clients_lock, flags);
135 if (!in_interrupt() && current->fs->root) {
136 static char client_requested[64];
137 static char card_requested[SNDRV_CARDS];
141 if (! client_requested[clientid] && current->fs->root) {
142 client_requested[clientid] = 1;
143 for (idx = 0; idx < 64; idx++) {
144 if (seq_client_load[idx] < 0)
146 if (seq_client_load[idx] == clientid) {
147 request_module("snd-seq-client-%i", clientid);
152 } else if (clientid >= 64 && clientid < 128) {
153 int card = (clientid - 64) / 8;
154 if (card < snd_ecards_limit) {
155 if (! card_requested[card]) {
156 card_requested[card] = 1;
157 snd_request_card(card);
159 snd_seq_device_load_drivers();
162 spin_lock_irqsave(&clients_lock, flags);
163 client = clientptr(clientid);
166 spin_unlock_irqrestore(&clients_lock, flags);
172 snd_use_lock_use(&client->use_lock);
173 spin_unlock_irqrestore(&clients_lock, flags);
177 static void usage_alloc(usage_t * res, int num)
180 if (res->cur > res->peak)
181 res->peak = res->cur;
184 static void usage_free(usage_t * res, int num)
189 /* initialise data structures */
190 int __init client_init_data(void)
192 /* zap out the client table */
193 memset(&clienttablock, 0, sizeof(clienttablock));
194 memset(&clienttab, 0, sizeof(clienttab));
199 static client_t *seq_create_client1(int client_index, int poolsize)
205 /* init client data */
206 client = kzalloc(sizeof(*client), GFP_KERNEL);
209 client->pool = snd_seq_pool_new(poolsize);
210 if (client->pool == NULL) {
214 client->type = NO_CLIENT;
215 snd_use_lock_init(&client->use_lock);
216 rwlock_init(&client->ports_lock);
217 init_MUTEX(&client->ports_mutex);
218 INIT_LIST_HEAD(&client->ports_list_head);
220 /* find free slot in the client table */
221 spin_lock_irqsave(&clients_lock, flags);
222 if (client_index < 0) {
223 for (c = 128; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
224 if (clienttab[c] || clienttablock[c])
226 clienttab[client->number = c] = client;
227 spin_unlock_irqrestore(&clients_lock, flags);
231 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
232 clienttab[client->number = client_index] = client;
233 spin_unlock_irqrestore(&clients_lock, flags);
237 spin_unlock_irqrestore(&clients_lock, flags);
238 snd_seq_pool_delete(&client->pool);
240 return NULL; /* no free slot found or busy, return failure code */
244 static int seq_free_client1(client_t *client)
248 snd_assert(client != NULL, return -EINVAL);
249 snd_seq_delete_all_ports(client);
250 snd_seq_queue_client_leave(client->number);
251 spin_lock_irqsave(&clients_lock, flags);
252 clienttablock[client->number] = 1;
253 clienttab[client->number] = NULL;
254 spin_unlock_irqrestore(&clients_lock, flags);
255 snd_use_lock_sync(&client->use_lock);
256 snd_seq_queue_client_termination(client->number);
258 snd_seq_pool_delete(&client->pool);
259 spin_lock_irqsave(&clients_lock, flags);
260 clienttablock[client->number] = 0;
261 spin_unlock_irqrestore(&clients_lock, flags);
266 static void seq_free_client(client_t * client)
268 down(®ister_mutex);
269 switch (client->type) {
271 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n", client->number);
275 seq_free_client1(client);
276 usage_free(&client_usage, 1);
280 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n", client->number, client->type);
284 snd_seq_system_client_ev_client_exit(client->number);
289 /* -------------------------------------------------------- */
291 /* create a user client */
292 static int snd_seq_open(struct inode *inode, struct file *file)
294 int c, mode; /* client id */
298 if (down_interruptible(®ister_mutex))
300 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
301 if (client == NULL) {
303 return -ENOMEM; /* failure code */
306 mode = snd_seq_file_flags(file);
307 if (mode & SNDRV_SEQ_LFLG_INPUT)
308 client->accept_input = 1;
309 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
310 client->accept_output = 1;
312 user = &client->data.user;
314 user->fifo_pool_size = 0;
316 if (mode & SNDRV_SEQ_LFLG_INPUT) {
317 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
318 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
319 if (user->fifo == NULL) {
320 seq_free_client1(client);
327 usage_alloc(&client_usage, 1);
328 client->type = USER_CLIENT;
332 file->private_data = client;
334 /* fill client data */
336 sprintf(client->name, "Client-%d", c);
338 /* make others aware this new client */
339 snd_seq_system_client_ev_client_start(c);
344 /* delete a user client */
345 static int snd_seq_release(struct inode *inode, struct file *file)
347 client_t *client = (client_t *) file->private_data;
350 seq_free_client(client);
351 if (client->data.user.fifo)
352 snd_seq_fifo_delete(&client->data.user.fifo);
360 /* handle client read() */
361 /* possible error values:
362 * -ENXIO invalid client or file open mode
363 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
364 * -EINVAL no enough user-space buffer to write the whole event
365 * -EFAULT seg. fault during copy to user space
367 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
369 client_t *client = (client_t *) file->private_data;
373 snd_seq_event_cell_t *cell;
375 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
378 if (!access_ok(VERIFY_WRITE, buf, count))
381 /* check client structures are in place */
382 snd_assert(client != NULL, return -ENXIO);
384 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
387 if (atomic_read(&fifo->overflow) > 0) {
388 /* buffer overflow is detected */
389 snd_seq_fifo_clear(fifo);
390 /* return error code */
396 snd_seq_fifo_lock(fifo);
398 /* while data available in queue */
399 while (count >= sizeof(snd_seq_event_t)) {
402 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
403 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
406 if (snd_seq_ev_is_variable(&cell->event)) {
407 snd_seq_event_t tmpev;
409 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
410 if (copy_to_user(buf, &tmpev, sizeof(snd_seq_event_t))) {
414 count -= sizeof(snd_seq_event_t);
415 buf += sizeof(snd_seq_event_t);
416 err = snd_seq_expand_var_event(&cell->event, count,
417 (char __force *)buf, 0,
418 sizeof(snd_seq_event_t));
425 if (copy_to_user(buf, &cell->event, sizeof(snd_seq_event_t))) {
429 count -= sizeof(snd_seq_event_t);
430 buf += sizeof(snd_seq_event_t);
432 snd_seq_cell_free(cell);
433 cell = NULL; /* to be sure */
434 result += sizeof(snd_seq_event_t);
439 snd_seq_fifo_cell_putback(fifo, cell);
440 if (err == -EAGAIN && result > 0)
443 snd_seq_fifo_unlock(fifo);
445 return (err < 0) ? err : result;
450 * check access permission to the port
452 static int check_port_perm(client_port_t *port, unsigned int flags)
454 if ((port->capability & flags) != flags)
460 * check if the destination client is available, and return the pointer
461 * if filter is non-zero, client filter bitmap is tested.
463 static client_t *get_event_dest_client(snd_seq_event_t *event, int filter)
467 dest = snd_seq_client_use_ptr(event->dest.client);
470 if (! dest->accept_input)
472 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
473 ! test_bit(event->type, dest->event_filter))
475 if (filter && !(dest->filter & filter))
478 return dest; /* ok - accessible */
480 snd_seq_client_unlock(dest);
486 * Return the error event.
488 * If the receiver client is a user client, the original event is
489 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
490 * the original event is also variable length, the external data is
491 * copied after the event record.
492 * If the receiver client is a kernel client, the original event is
493 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
496 static int bounce_error_event(client_t *client, snd_seq_event_t *event,
497 int err, int atomic, int hop)
499 snd_seq_event_t bounce_ev;
502 if (client == NULL ||
503 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
504 ! client->accept_input)
505 return 0; /* ignored */
507 /* set up quoted error */
508 memset(&bounce_ev, 0, sizeof(bounce_ev));
509 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
510 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
511 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
512 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
513 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
514 bounce_ev.dest.client = client->number;
515 bounce_ev.dest.port = event->source.port;
516 bounce_ev.data.quote.origin = event->dest;
517 bounce_ev.data.quote.event = event;
518 bounce_ev.data.quote.value = -err; /* use positive value */
519 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
521 client->event_lost++;
530 * rewrite the time-stamp of the event record with the curren time
531 * of the given queue.
532 * return non-zero if updated.
534 static int update_timestamp_of_queue(snd_seq_event_t *event, int queue, int real_time)
541 event->queue = queue;
542 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
544 event->time.time = snd_seq_timer_get_cur_time(q->timer);
545 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
547 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
548 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
556 * deliver an event to the specified destination.
557 * if filter is non-zero, client filter bitmap is tested.
559 * RETURN VALUE: 0 : if succeeded
562 static int snd_seq_deliver_single_event(client_t *client,
563 snd_seq_event_t *event,
564 int filter, int atomic, int hop)
566 client_t *dest = NULL;
567 client_port_t *dest_port = NULL;
568 int result = -ENOENT;
571 direct = snd_seq_ev_is_direct(event);
573 dest = get_event_dest_client(event, filter);
576 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
577 if (dest_port == NULL)
580 /* check permission */
581 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
586 if (dest_port->timestamping)
587 update_timestamp_of_queue(event, dest_port->time_queue,
588 dest_port->time_real);
590 switch (dest->type) {
592 if (dest->data.user.fifo)
593 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
597 if (dest_port->event_input == NULL)
599 result = dest_port->event_input(event, direct, dest_port->private_data, atomic, hop);
607 snd_seq_port_unlock(dest_port);
609 snd_seq_client_unlock(dest);
611 if (result < 0 && !direct) {
612 result = bounce_error_event(client, event, result, atomic, hop);
619 * send the event to all subscribers:
621 static int deliver_to_subscribers(client_t *client,
622 snd_seq_event_t *event,
626 int err = 0, num_ev = 0;
627 snd_seq_event_t event_saved;
628 client_port_t *src_port;
630 port_subs_info_t *grp;
632 src_port = snd_seq_port_use_ptr(client, event->source.port);
633 if (src_port == NULL)
634 return -EINVAL; /* invalid source port */
635 /* save original event record */
636 event_saved = *event;
637 grp = &src_port->c_src;
641 read_lock(&grp->list_lock);
643 down_read(&grp->list_mutex);
644 list_for_each(p, &grp->list_head) {
645 subs = list_entry(p, subscribers_t, src_list);
646 event->dest = subs->info.dest;
647 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
648 /* convert time according to flag with subscription */
649 update_timestamp_of_queue(event, subs->info.queue,
650 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
651 err = snd_seq_deliver_single_event(client, event,
656 /* restore original event record */
657 *event = event_saved;
660 read_unlock(&grp->list_lock);
662 up_read(&grp->list_mutex);
663 *event = event_saved; /* restore */
664 snd_seq_port_unlock(src_port);
665 return (err < 0) ? err : num_ev;
669 #ifdef SUPPORT_BROADCAST
671 * broadcast to all ports:
673 static int port_broadcast_event(client_t *client,
674 snd_seq_event_t *event,
677 int num_ev = 0, err = 0;
678 client_t *dest_client;
681 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
682 if (dest_client == NULL)
683 return 0; /* no matching destination */
685 read_lock(&dest_client->ports_lock);
686 list_for_each(p, &dest_client->ports_list_head) {
687 client_port_t *port = list_entry(p, client_port_t, list);
688 event->dest.port = port->addr.port;
689 /* pass NULL as source client to avoid error bounce */
690 err = snd_seq_deliver_single_event(NULL, event,
691 SNDRV_SEQ_FILTER_BROADCAST,
697 read_unlock(&dest_client->ports_lock);
698 snd_seq_client_unlock(dest_client);
699 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
700 return (err < 0) ? err : num_ev;
704 * send the event to all clients:
705 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
707 static int broadcast_event(client_t *client,
708 snd_seq_event_t *event, int atomic, int hop)
710 int err = 0, num_ev = 0;
714 addr = event->dest; /* save */
716 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
717 /* don't send to itself */
718 if (dest == client->number)
720 event->dest.client = dest;
721 event->dest.port = addr.port;
722 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
723 err = port_broadcast_event(client, event, atomic, hop);
725 /* pass NULL as source client to avoid error bounce */
726 err = snd_seq_deliver_single_event(NULL, event,
727 SNDRV_SEQ_FILTER_BROADCAST,
733 event->dest = addr; /* restore */
734 return (err < 0) ? err : num_ev;
738 /* multicast - not supported yet */
739 static int multicast_event(client_t *client, snd_seq_event_t *event,
742 snd_printd("seq: multicast not supported yet.\n");
743 return 0; /* ignored */
745 #endif /* SUPPORT_BROADCAST */
748 /* deliver an event to the destination port(s).
749 * if the event is to subscribers or broadcast, the event is dispatched
750 * to multiple targets.
752 * RETURN VALUE: n > 0 : the number of delivered events.
753 * n == 0 : the event was not passed to any client.
754 * n < 0 : error - event was not processed.
756 static int snd_seq_deliver_event(client_t *client, snd_seq_event_t *event,
762 if (hop >= SNDRV_SEQ_MAX_HOPS) {
763 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
764 event->source.client, event->source.port,
765 event->dest.client, event->dest.port);
769 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
770 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
771 result = deliver_to_subscribers(client, event, atomic, hop);
772 #ifdef SUPPORT_BROADCAST
773 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
774 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
775 result = broadcast_event(client, event, atomic, hop);
776 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
777 result = multicast_event(client, event, atomic, hop);
778 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
779 result = port_broadcast_event(client, event, atomic, hop);
782 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
788 * dispatch an event cell:
789 * This function is called only from queue check routines in timer
790 * interrupts or after enqueued.
791 * The event cell shall be released or re-queued in this function.
793 * RETURN VALUE: n > 0 : the number of delivered events.
794 * n == 0 : the event was not passed to any client.
795 * n < 0 : error - event was not processed.
797 int snd_seq_dispatch_event(snd_seq_event_cell_t *cell, int atomic, int hop)
802 snd_assert(cell != NULL, return -EINVAL);
804 client = snd_seq_client_use_ptr(cell->event.source.client);
805 if (client == NULL) {
806 snd_seq_cell_free(cell); /* release this cell */
810 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
812 * the event cell is re-used as a NOTE-OFF event and
815 snd_seq_event_t tmpev, *ev;
817 /* reserve this event to enqueue note-off later */
819 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
820 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
823 * This was originally a note event. We now re-use the
824 * cell for the note-off event.
828 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
829 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
831 /* add the duration time */
832 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
833 case SNDRV_SEQ_TIME_STAMP_TICK:
834 ev->time.tick += ev->data.note.duration;
836 case SNDRV_SEQ_TIME_STAMP_REAL:
837 /* unit for duration is ms */
838 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
839 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
840 ev->time.time.tv_nsec / 1000000000;
841 ev->time.time.tv_nsec %= 1000000000;
844 ev->data.note.velocity = ev->data.note.off_velocity;
846 /* Now queue this cell as the note off event */
847 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
848 snd_seq_cell_free(cell); /* release this cell */
852 * event cell is freed after processing the event
855 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
856 snd_seq_cell_free(cell);
859 snd_seq_client_unlock(client);
864 /* Allocate a cell from client pool and enqueue it to queue:
865 * if pool is empty and blocking is TRUE, sleep until a new cell is
868 static int snd_seq_client_enqueue_event(client_t *client,
869 snd_seq_event_t *event,
870 struct file *file, int blocking,
873 snd_seq_event_cell_t *cell;
876 /* special queue values - force direct passing */
877 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
878 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
879 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
881 #ifdef SUPPORT_BROADCAST
882 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
883 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
884 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
887 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
888 /* check presence of source port */
889 client_port_t *src_port = snd_seq_port_use_ptr(client, event->source.port);
890 if (src_port == NULL)
892 snd_seq_port_unlock(src_port);
895 /* direct event processing without enqueued */
896 if (snd_seq_ev_is_direct(event)) {
897 if (event->type == SNDRV_SEQ_EVENT_NOTE)
898 return -EINVAL; /* this event must be enqueued! */
899 return snd_seq_deliver_event(client, event, atomic, hop);
902 /* Not direct, normal queuing */
903 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
904 return -EINVAL; /* invalid queue */
905 if (! snd_seq_write_pool_allocated(client))
906 return -ENXIO; /* queue is not allocated */
908 /* allocate an event cell */
909 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
913 /* we got a cell. enqueue it. */
914 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
915 snd_seq_cell_free(cell);
924 * check validity of event type and data length.
925 * return non-zero if invalid.
927 static int check_event_type_and_length(snd_seq_event_t *ev)
929 switch (snd_seq_ev_length_type(ev)) {
930 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
931 if (snd_seq_ev_is_variable_type(ev))
934 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
935 if (! snd_seq_ev_is_variable_type(ev) ||
936 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
939 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
940 if (! snd_seq_ev_is_instr_type(ev) ||
941 ! snd_seq_ev_is_direct(ev))
950 /* possible error values:
951 * -ENXIO invalid client or file open mode
952 * -ENOMEM malloc failed
953 * -EFAULT seg. fault during copy from user space
954 * -EINVAL invalid event
955 * -EAGAIN no space in output pool
956 * -EINTR interrupts while sleep
957 * -EMLINK too many hops
958 * others depends on return value from driver callback
960 static ssize_t snd_seq_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
962 client_t *client = (client_t *) file->private_data;
963 int written = 0, len;
965 snd_seq_event_t event;
967 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
970 /* check client structures are in place */
971 snd_assert(client != NULL, return -ENXIO);
973 if (!client->accept_output || client->pool == NULL)
976 /* allocate the pool now if the pool is not allocated yet */
977 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
978 if (snd_seq_pool_init(client->pool) < 0)
982 /* only process whole events */
983 while (count >= sizeof(snd_seq_event_t)) {
984 /* Read in the event header from the user */
986 if (copy_from_user(&event, buf, len)) {
990 event.source.client = client->number; /* fill in client number */
991 /* Check for extension data length */
992 if (check_event_type_and_length(&event)) {
997 /* check for special events */
998 if (event.type == SNDRV_SEQ_EVENT_NONE)
1000 else if (snd_seq_ev_is_reserved(&event)) {
1005 if (snd_seq_ev_is_variable(&event)) {
1006 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1007 if ((size_t)(extlen + len) > count) {
1008 /* back out, will get an error this time or next */
1012 /* set user space pointer */
1013 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1014 event.data.ext.ptr = (char __force *)buf
1015 + sizeof(snd_seq_event_t);
1016 len += extlen; /* increment data length */
1018 #ifdef CONFIG_COMPAT
1019 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1020 void *ptr = compat_ptr(event.data.raw32.d[1]);
1021 event.data.ext.ptr = ptr;
1026 /* ok, enqueue it */
1027 err = snd_seq_client_enqueue_event(client, &event, file,
1028 !(file->f_flags & O_NONBLOCK),
1034 /* Update pointers and counts */
1040 return written ? written : err;
1047 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1049 client_t *client = (client_t *) file->private_data;
1050 unsigned int mask = 0;
1052 /* check client structures are in place */
1053 snd_assert(client != NULL, return -ENXIO);
1055 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1056 client->data.user.fifo) {
1058 /* check if data is available in the outqueue */
1059 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1060 mask |= POLLIN | POLLRDNORM;
1063 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1065 /* check if data is available in the pool */
1066 if (!snd_seq_write_pool_allocated(client) ||
1067 snd_seq_pool_poll_wait(client->pool, file, wait))
1068 mask |= POLLOUT | POLLWRNORM;
1075 /*-----------------------------------------------------*/
1078 /* SYSTEM_INFO ioctl() */
1079 static int snd_seq_ioctl_system_info(client_t *client, void __user *arg)
1081 snd_seq_system_info_t info;
1083 memset(&info, 0, sizeof(info));
1084 /* fill the info fields */
1085 info.queues = SNDRV_SEQ_MAX_QUEUES;
1086 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1087 info.ports = 256; /* fixed limit */
1088 info.channels = 256; /* fixed limit */
1089 info.cur_clients = client_usage.cur;
1090 info.cur_queues = snd_seq_queue_get_cur_queues();
1092 if (copy_to_user(arg, &info, sizeof(info)))
1098 /* RUNNING_MODE ioctl() */
1099 static int snd_seq_ioctl_running_mode(client_t *client, void __user *arg)
1101 struct sndrv_seq_running_info info;
1105 if (copy_from_user(&info, arg, sizeof(info)))
1108 /* requested client number */
1109 cptr = snd_seq_client_use_ptr(info.client);
1111 return -ENOENT; /* don't change !!! */
1113 #ifdef SNDRV_BIG_ENDIAN
1114 if (! info.big_endian) {
1119 if (info.big_endian) {
1125 if (info.cpu_mode > sizeof(long)) {
1129 cptr->convert32 = (info.cpu_mode < sizeof(long));
1131 snd_seq_client_unlock(cptr);
1135 /* CLIENT_INFO ioctl() */
1136 static void get_client_info(client_t *cptr, snd_seq_client_info_t *info)
1138 info->client = cptr->number;
1140 /* fill the info fields */
1141 info->type = cptr->type;
1142 strcpy(info->name, cptr->name);
1143 info->filter = cptr->filter;
1144 info->event_lost = cptr->event_lost;
1145 memcpy(info->event_filter, cptr->event_filter, 32);
1146 info->num_ports = cptr->num_ports;
1147 memset(info->reserved, 0, sizeof(info->reserved));
1150 static int snd_seq_ioctl_get_client_info(client_t * client, void __user *arg)
1153 snd_seq_client_info_t client_info;
1155 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1158 /* requested client number */
1159 cptr = snd_seq_client_use_ptr(client_info.client);
1161 return -ENOENT; /* don't change !!! */
1163 get_client_info(cptr, &client_info);
1164 snd_seq_client_unlock(cptr);
1166 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1172 /* CLIENT_INFO ioctl() */
1173 static int snd_seq_ioctl_set_client_info(client_t * client, void __user *arg)
1175 snd_seq_client_info_t client_info;
1177 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1180 /* it is not allowed to set the info fields for an another client */
1181 if (client->number != client_info.client)
1183 /* also client type must be set now */
1184 if (client->type != client_info.type)
1187 /* fill the info fields */
1188 if (client_info.name[0])
1189 strlcpy(client->name, client_info.name, sizeof(client->name));
1191 client->filter = client_info.filter;
1192 client->event_lost = client_info.event_lost;
1193 memcpy(client->event_filter, client_info.event_filter, 32);
1200 * CREATE PORT ioctl()
1202 static int snd_seq_ioctl_create_port(client_t * client, void __user *arg)
1204 client_port_t *port;
1205 snd_seq_port_info_t info;
1206 snd_seq_port_callback_t *callback;
1208 if (copy_from_user(&info, arg, sizeof(info)))
1211 /* it is not allowed to create the port for an another client */
1212 if (info.addr.client != client->number)
1215 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1219 if (client->type == USER_CLIENT && info.kernel) {
1220 snd_seq_delete_port(client, port->addr.port);
1223 if (client->type == KERNEL_CLIENT) {
1224 if ((callback = info.kernel) != NULL) {
1225 if (callback->owner)
1226 port->owner = callback->owner;
1227 port->private_data = callback->private_data;
1228 port->private_free = callback->private_free;
1229 port->callback_all = callback->callback_all;
1230 port->event_input = callback->event_input;
1231 port->c_src.open = callback->subscribe;
1232 port->c_src.close = callback->unsubscribe;
1233 port->c_dest.open = callback->use;
1234 port->c_dest.close = callback->unuse;
1238 info.addr = port->addr;
1240 snd_seq_set_port_info(port, &info);
1241 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1243 if (copy_to_user(arg, &info, sizeof(info)))
1250 * DELETE PORT ioctl()
1252 static int snd_seq_ioctl_delete_port(client_t * client, void __user *arg)
1254 snd_seq_port_info_t info;
1257 /* set passed parameters */
1258 if (copy_from_user(&info, arg, sizeof(info)))
1261 /* it is not allowed to remove the port for an another client */
1262 if (info.addr.client != client->number)
1265 err = snd_seq_delete_port(client, info.addr.port);
1267 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1273 * GET_PORT_INFO ioctl() (on any client)
1275 static int snd_seq_ioctl_get_port_info(client_t *client, void __user *arg)
1278 client_port_t *port;
1279 snd_seq_port_info_t info;
1281 if (copy_from_user(&info, arg, sizeof(info)))
1283 cptr = snd_seq_client_use_ptr(info.addr.client);
1287 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1289 snd_seq_client_unlock(cptr);
1290 return -ENOENT; /* don't change */
1294 snd_seq_get_port_info(port, &info);
1295 snd_seq_port_unlock(port);
1296 snd_seq_client_unlock(cptr);
1298 if (copy_to_user(arg, &info, sizeof(info)))
1305 * SET_PORT_INFO ioctl() (only ports on this/own client)
1307 static int snd_seq_ioctl_set_port_info(client_t * client, void __user *arg)
1309 client_port_t *port;
1310 snd_seq_port_info_t info;
1312 if (copy_from_user(&info, arg, sizeof(info)))
1315 if (info.addr.client != client->number) /* only set our own ports ! */
1317 port = snd_seq_port_use_ptr(client, info.addr.port);
1319 snd_seq_set_port_info(port, &info);
1320 snd_seq_port_unlock(port);
1327 * port subscription (connection)
1329 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1330 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1332 static int check_subscription_permission(client_t *client, client_port_t *sport,
1333 client_port_t *dport,
1334 snd_seq_port_subscribe_t *subs)
1336 if (client->number != subs->sender.client &&
1337 client->number != subs->dest.client) {
1338 /* connection by third client - check export permission */
1339 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1341 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1345 /* check read permission */
1346 /* if sender or receiver is the subscribing client itself,
1347 * no permission check is necessary
1349 if (client->number != subs->sender.client) {
1350 if (! check_port_perm(sport, PERM_RD))
1353 /* check write permission */
1354 if (client->number != subs->dest.client) {
1355 if (! check_port_perm(dport, PERM_WR))
1362 * send an subscription notify event to user client:
1363 * client must be user client.
1365 int snd_seq_client_notify_subscription(int client, int port,
1366 snd_seq_port_subscribe_t *info, int evtype)
1368 snd_seq_event_t event;
1370 memset(&event, 0, sizeof(event));
1371 event.type = evtype;
1372 event.data.connect.dest = info->dest;
1373 event.data.connect.sender = info->sender;
1375 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1380 * add to port's subscription list IOCTL interface
1382 static int snd_seq_ioctl_subscribe_port(client_t * client, void __user *arg)
1384 int result = -EINVAL;
1385 client_t *receiver = NULL, *sender = NULL;
1386 client_port_t *sport = NULL, *dport = NULL;
1387 snd_seq_port_subscribe_t subs;
1389 if (copy_from_user(&subs, arg, sizeof(subs)))
1392 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1394 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1396 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1398 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1401 result = check_subscription_permission(client, sport, dport, &subs);
1406 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1407 if (! result) /* broadcast announce */
1408 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1409 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1412 snd_seq_port_unlock(sport);
1414 snd_seq_port_unlock(dport);
1416 snd_seq_client_unlock(sender);
1418 snd_seq_client_unlock(receiver);
1424 * remove from port's subscription list
1426 static int snd_seq_ioctl_unsubscribe_port(client_t * client, void __user *arg)
1428 int result = -ENXIO;
1429 client_t *receiver = NULL, *sender = NULL;
1430 client_port_t *sport = NULL, *dport = NULL;
1431 snd_seq_port_subscribe_t subs;
1433 if (copy_from_user(&subs, arg, sizeof(subs)))
1436 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1438 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1440 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1442 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1445 result = check_subscription_permission(client, sport, dport, &subs);
1449 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1450 if (! result) /* broadcast announce */
1451 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1452 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1455 snd_seq_port_unlock(sport);
1457 snd_seq_port_unlock(dport);
1459 snd_seq_client_unlock(sender);
1461 snd_seq_client_unlock(receiver);
1466 /* CREATE_QUEUE ioctl() */
1467 static int snd_seq_ioctl_create_queue(client_t *client, void __user *arg)
1469 snd_seq_queue_info_t info;
1473 if (copy_from_user(&info, arg, sizeof(info)))
1476 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1480 q = queueptr(result);
1484 info.queue = q->queue;
1485 info.locked = q->locked;
1486 info.owner = q->owner;
1488 /* set queue name */
1490 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1491 strlcpy(q->name, info.name, sizeof(q->name));
1494 if (copy_to_user(arg, &info, sizeof(info)))
1500 /* DELETE_QUEUE ioctl() */
1501 static int snd_seq_ioctl_delete_queue(client_t *client, void __user *arg)
1503 snd_seq_queue_info_t info;
1505 if (copy_from_user(&info, arg, sizeof(info)))
1508 return snd_seq_queue_delete(client->number, info.queue);
1511 /* GET_QUEUE_INFO ioctl() */
1512 static int snd_seq_ioctl_get_queue_info(client_t *client, void __user *arg)
1514 snd_seq_queue_info_t info;
1517 if (copy_from_user(&info, arg, sizeof(info)))
1520 q = queueptr(info.queue);
1524 memset(&info, 0, sizeof(info));
1525 info.queue = q->queue;
1526 info.owner = q->owner;
1527 info.locked = q->locked;
1528 strlcpy(info.name, q->name, sizeof(info.name));
1531 if (copy_to_user(arg, &info, sizeof(info)))
1537 /* SET_QUEUE_INFO ioctl() */
1538 static int snd_seq_ioctl_set_queue_info(client_t *client, void __user *arg)
1540 snd_seq_queue_info_t info;
1543 if (copy_from_user(&info, arg, sizeof(info)))
1546 if (info.owner != client->number)
1549 /* change owner/locked permission */
1550 if (snd_seq_queue_check_access(info.queue, client->number)) {
1551 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1554 snd_seq_queue_use(info.queue, client->number, 1);
1559 q = queueptr(info.queue);
1562 if (q->owner != client->number) {
1566 strlcpy(q->name, info.name, sizeof(q->name));
1572 /* GET_NAMED_QUEUE ioctl() */
1573 static int snd_seq_ioctl_get_named_queue(client_t *client, void __user *arg)
1575 snd_seq_queue_info_t info;
1578 if (copy_from_user(&info, arg, sizeof(info)))
1581 q = snd_seq_queue_find_name(info.name);
1584 info.queue = q->queue;
1585 info.owner = q->owner;
1586 info.locked = q->locked;
1589 if (copy_to_user(arg, &info, sizeof(info)))
1595 /* GET_QUEUE_STATUS ioctl() */
1596 static int snd_seq_ioctl_get_queue_status(client_t * client, void __user *arg)
1598 snd_seq_queue_status_t status;
1602 if (copy_from_user(&status, arg, sizeof(status)))
1605 queue = queueptr(status.queue);
1608 memset(&status, 0, sizeof(status));
1609 status.queue = queue->queue;
1612 status.events = queue->tickq->cells + queue->timeq->cells;
1614 status.time = snd_seq_timer_get_cur_time(tmr);
1615 status.tick = snd_seq_timer_get_cur_tick(tmr);
1617 status.running = tmr->running;
1619 status.flags = queue->flags;
1622 if (copy_to_user(arg, &status, sizeof(status)))
1628 /* GET_QUEUE_TEMPO ioctl() */
1629 static int snd_seq_ioctl_get_queue_tempo(client_t * client, void __user *arg)
1631 snd_seq_queue_tempo_t tempo;
1635 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1638 queue = queueptr(tempo.queue);
1641 memset(&tempo, 0, sizeof(tempo));
1642 tempo.queue = queue->queue;
1646 tempo.tempo = tmr->tempo;
1647 tempo.ppq = tmr->ppq;
1648 tempo.skew_value = tmr->skew;
1649 tempo.skew_base = tmr->skew_base;
1652 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1658 /* SET_QUEUE_TEMPO ioctl() */
1659 int snd_seq_set_queue_tempo(int client, snd_seq_queue_tempo_t *tempo)
1661 if (!snd_seq_queue_check_access(tempo->queue, client))
1663 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1666 static int snd_seq_ioctl_set_queue_tempo(client_t * client, void __user *arg)
1669 snd_seq_queue_tempo_t tempo;
1671 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1674 result = snd_seq_set_queue_tempo(client->number, &tempo);
1675 return result < 0 ? result : 0;
1679 /* GET_QUEUE_TIMER ioctl() */
1680 static int snd_seq_ioctl_get_queue_timer(client_t * client, void __user *arg)
1682 snd_seq_queue_timer_t timer;
1686 if (copy_from_user(&timer, arg, sizeof(timer)))
1689 queue = queueptr(timer.queue);
1693 if (down_interruptible(&queue->timer_mutex)) {
1695 return -ERESTARTSYS;
1698 memset(&timer, 0, sizeof(timer));
1699 timer.queue = queue->queue;
1701 timer.type = tmr->type;
1702 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1703 timer.u.alsa.id = tmr->alsa_id;
1704 timer.u.alsa.resolution = tmr->preferred_resolution;
1706 up(&queue->timer_mutex);
1709 if (copy_to_user(arg, &timer, sizeof(timer)))
1715 /* SET_QUEUE_TIMER ioctl() */
1716 static int snd_seq_ioctl_set_queue_timer(client_t * client, void __user *arg)
1719 snd_seq_queue_timer_t timer;
1721 if (copy_from_user(&timer, arg, sizeof(timer)))
1724 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1727 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1731 q = queueptr(timer.queue);
1734 if (down_interruptible(&q->timer_mutex)) {
1736 return -ERESTARTSYS;
1739 snd_seq_queue_timer_close(timer.queue);
1740 tmr->type = timer.type;
1741 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1742 tmr->alsa_id = timer.u.alsa.id;
1743 tmr->preferred_resolution = timer.u.alsa.resolution;
1745 result = snd_seq_queue_timer_open(timer.queue);
1746 up(&q->timer_mutex);
1756 /* GET_QUEUE_CLIENT ioctl() */
1757 static int snd_seq_ioctl_get_queue_client(client_t * client, void __user *arg)
1759 snd_seq_queue_client_t info;
1762 if (copy_from_user(&info, arg, sizeof(info)))
1765 used = snd_seq_queue_is_used(info.queue, client->number);
1769 info.client = client->number;
1771 if (copy_to_user(arg, &info, sizeof(info)))
1777 /* SET_QUEUE_CLIENT ioctl() */
1778 static int snd_seq_ioctl_set_queue_client(client_t * client, void __user *arg)
1781 snd_seq_queue_client_t info;
1783 if (copy_from_user(&info, arg, sizeof(info)))
1786 if (info.used >= 0) {
1787 err = snd_seq_queue_use(info.queue, client->number, info.used);
1792 return snd_seq_ioctl_get_queue_client(client, arg);
1796 /* GET_CLIENT_POOL ioctl() */
1797 static int snd_seq_ioctl_get_client_pool(client_t * client, void __user *arg)
1799 snd_seq_client_pool_t info;
1802 if (copy_from_user(&info, arg, sizeof(info)))
1805 cptr = snd_seq_client_use_ptr(info.client);
1808 memset(&info, 0, sizeof(info));
1809 info.output_pool = cptr->pool->size;
1810 info.output_room = cptr->pool->room;
1811 info.output_free = info.output_pool;
1813 info.output_free = snd_seq_unused_cells(cptr->pool);
1814 if (cptr->type == USER_CLIENT) {
1815 info.input_pool = cptr->data.user.fifo_pool_size;
1816 info.input_free = info.input_pool;
1817 if (cptr->data.user.fifo)
1818 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1820 info.input_pool = 0;
1821 info.input_free = 0;
1823 snd_seq_client_unlock(cptr);
1825 if (copy_to_user(arg, &info, sizeof(info)))
1830 /* SET_CLIENT_POOL ioctl() */
1831 static int snd_seq_ioctl_set_client_pool(client_t * client, void __user *arg)
1833 snd_seq_client_pool_t info;
1836 if (copy_from_user(&info, arg, sizeof(info)))
1839 if (client->number != info.client)
1840 return -EINVAL; /* can't change other clients */
1842 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1843 (! snd_seq_write_pool_allocated(client) ||
1844 info.output_pool != client->pool->size)) {
1845 if (snd_seq_write_pool_allocated(client)) {
1846 /* remove all existing cells */
1847 snd_seq_queue_client_leave_cells(client->number);
1848 snd_seq_pool_done(client->pool);
1850 client->pool->size = info.output_pool;
1851 rc = snd_seq_pool_init(client->pool);
1855 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1856 info.input_pool >= 1 &&
1857 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1858 info.input_pool != client->data.user.fifo_pool_size) {
1859 /* change pool size */
1860 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1863 client->data.user.fifo_pool_size = info.input_pool;
1865 if (info.output_room >= 1 &&
1866 info.output_room <= client->pool->size) {
1867 client->pool->room = info.output_room;
1870 return snd_seq_ioctl_get_client_pool(client, arg);
1874 /* REMOVE_EVENTS ioctl() */
1875 static int snd_seq_ioctl_remove_events(client_t * client, void __user *arg)
1877 snd_seq_remove_events_t info;
1879 if (copy_from_user(&info, arg, sizeof(info)))
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)
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(client_t *client, void __user *arg)
1907 client_t *sender = NULL;
1908 client_port_t *sport = NULL;
1909 snd_seq_port_subscribe_t subs;
1912 if (copy_from_user(&subs, arg, sizeof(subs)))
1916 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1918 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1920 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1929 snd_seq_port_unlock(sport);
1931 snd_seq_client_unlock(sender);
1933 if (copy_to_user(arg, &subs, sizeof(subs)))
1941 * get subscription info - check only its presence
1943 static int snd_seq_ioctl_query_subs(client_t *client, void __user *arg)
1945 int result = -ENXIO;
1946 client_t *cptr = NULL;
1947 client_port_t *port = NULL;
1948 snd_seq_query_subs_t subs;
1949 port_subs_info_t *group;
1950 struct list_head *p;
1953 if (copy_from_user(&subs, arg, sizeof(subs)))
1956 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
1958 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
1961 switch (subs.type) {
1962 case SNDRV_SEQ_QUERY_SUBS_READ:
1963 group = &port->c_src;
1965 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1966 group = &port->c_dest;
1972 down_read(&group->list_mutex);
1973 /* search for the subscriber */
1974 subs.num_subs = group->count;
1977 list_for_each(p, &group->list_head) {
1978 if (i++ == subs.index) {
1981 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
1982 s = list_entry(p, subscribers_t, src_list);
1983 subs.addr = s->info.dest;
1985 s = list_entry(p, subscribers_t, dest_list);
1986 subs.addr = s->info.sender;
1988 subs.flags = s->info.flags;
1989 subs.queue = s->info.queue;
1994 up_read(&group->list_mutex);
1998 snd_seq_port_unlock(port);
2000 snd_seq_client_unlock(cptr);
2002 if (copy_to_user(arg, &subs, sizeof(subs)))
2012 static int snd_seq_ioctl_query_next_client(client_t *client, void __user *arg)
2014 client_t *cptr = NULL;
2015 snd_seq_client_info_t info;
2017 if (copy_from_user(&info, arg, sizeof(info)))
2020 /* search for next client */
2022 if (info.client < 0)
2024 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2025 cptr = snd_seq_client_use_ptr(info.client);
2032 get_client_info(cptr, &info);
2033 snd_seq_client_unlock(cptr);
2035 if (copy_to_user(arg, &info, sizeof(info)))
2043 static int snd_seq_ioctl_query_next_port(client_t *client, void __user *arg)
2046 client_port_t *port = NULL;
2047 snd_seq_port_info_t info;
2049 if (copy_from_user(&info, arg, sizeof(info)))
2051 cptr = snd_seq_client_use_ptr(info.addr.client);
2055 /* search for next port */
2057 port = snd_seq_port_query_nearest(cptr, &info);
2059 snd_seq_client_unlock(cptr);
2064 info.addr = port->addr;
2065 snd_seq_get_port_info(port, &info);
2066 snd_seq_port_unlock(port);
2067 snd_seq_client_unlock(cptr);
2069 if (copy_to_user(arg, &info, sizeof(info)))
2074 /* -------------------------------------------------------- */
2076 static struct seq_ioctl_table {
2078 int (*func)(client_t *client, void __user * arg);
2079 } ioctl_tables[] = {
2080 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2081 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2082 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2083 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2084 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2085 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2086 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2087 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2088 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2089 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2090 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2091 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2092 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2093 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2094 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2095 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2096 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2097 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2098 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2099 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2100 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2101 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2102 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2103 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2104 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2105 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2106 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2107 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2108 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2112 static int snd_seq_do_ioctl(client_t *client, unsigned int cmd, void __user *arg)
2114 struct seq_ioctl_table *p;
2117 case SNDRV_SEQ_IOCTL_PVERSION:
2118 /* return sequencer version number */
2119 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2120 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2121 /* return the id of this client */
2122 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2127 for (p = ioctl_tables; p->cmd; p++) {
2129 return p->func(client, arg);
2131 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2132 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2137 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2139 client_t *client = (client_t *) file->private_data;
2141 snd_assert(client != NULL, return -ENXIO);
2143 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2146 #ifdef CONFIG_COMPAT
2147 #include "seq_compat.c"
2149 #define snd_seq_ioctl_compat NULL
2152 /* -------------------------------------------------------- */
2155 /* exported to kernel modules */
2156 int snd_seq_create_kernel_client(snd_card_t *card, int client_index, snd_seq_client_callback_t * callback)
2160 snd_assert(! in_interrupt(), return -EBUSY);
2162 if (callback == NULL)
2164 if (card && client_index > 7)
2166 if (card == NULL && client_index > 63)
2169 client_index += 64 + (card->number << 3);
2171 if (down_interruptible(®ister_mutex))
2172 return -ERESTARTSYS;
2173 /* empty write queue as default */
2174 client = seq_create_client1(client_index, 0);
2175 if (client == NULL) {
2176 up(®ister_mutex);
2177 return -EBUSY; /* failure code */
2179 usage_alloc(&client_usage, 1);
2181 client->accept_input = callback->allow_output;
2182 client->accept_output = callback->allow_input;
2184 /* fill client data */
2185 client->data.kernel.card = card;
2186 client->data.kernel.private_data = callback->private_data;
2187 sprintf(client->name, "Client-%d", client->number);
2189 client->type = KERNEL_CLIENT;
2190 up(®ister_mutex);
2192 /* make others aware this new client */
2193 snd_seq_system_client_ev_client_start(client->number);
2195 /* return client number to caller */
2196 return client->number;
2199 /* exported to kernel modules */
2200 int snd_seq_delete_kernel_client(int client)
2204 snd_assert(! in_interrupt(), return -EBUSY);
2206 ptr = clientptr(client);
2210 seq_free_client(ptr);
2216 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2217 * and snd_seq_kernel_client_enqueue_blocking
2219 static int kernel_client_enqueue(int client, snd_seq_event_t *ev,
2220 struct file *file, int blocking,
2221 int atomic, int hop)
2226 snd_assert(ev != NULL, return -EINVAL);
2228 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2229 return 0; /* ignore this */
2230 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2231 return -EINVAL; /* quoted events can't be enqueued */
2233 /* fill in client number */
2234 ev->source.client = client;
2236 if (check_event_type_and_length(ev))
2239 cptr = snd_seq_client_use_ptr(client);
2243 if (! cptr->accept_output)
2246 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2248 snd_seq_client_unlock(cptr);
2253 * exported, called by kernel clients to enqueue events (w/o blocking)
2255 * RETURN VALUE: zero if succeed, negative if error
2257 int snd_seq_kernel_client_enqueue(int client, snd_seq_event_t * ev,
2258 int atomic, int hop)
2260 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2264 * exported, called by kernel clients to enqueue events (with blocking)
2266 * RETURN VALUE: zero if succeed, negative if error
2268 int snd_seq_kernel_client_enqueue_blocking(int client, snd_seq_event_t * ev,
2270 int atomic, int hop)
2272 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2277 * exported, called by kernel clients to dispatch events directly to other
2278 * clients, bypassing the queues. Event time-stamp will be updated.
2280 * RETURN VALUE: negative = delivery failed,
2281 * zero, or positive: the number of delivered events
2283 int snd_seq_kernel_client_dispatch(int client, snd_seq_event_t * ev,
2284 int atomic, int hop)
2289 snd_assert(ev != NULL, return -EINVAL);
2291 /* fill in client number */
2292 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2293 ev->source.client = client;
2295 if (check_event_type_and_length(ev))
2298 cptr = snd_seq_client_use_ptr(client);
2302 if (!cptr->accept_output)
2305 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2307 snd_seq_client_unlock(cptr);
2313 * exported, called by kernel clients to perform same functions as with
2316 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2322 client = clientptr(clientid);
2325 fs = snd_enter_user();
2326 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2332 /* exported (for OSS emulator) */
2333 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2337 client = clientptr(clientid);
2341 if (! snd_seq_write_pool_allocated(client))
2343 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2348 /*---------------------------------------------------------------------------*/
2353 static void snd_seq_info_dump_subscribers(snd_info_buffer_t *buffer, port_subs_info_t *group, int is_src, char *msg)
2355 struct list_head *p;
2359 down_read(&group->list_mutex);
2360 if (list_empty(&group->list_head)) {
2361 up_read(&group->list_mutex);
2364 snd_iprintf(buffer, msg);
2365 list_for_each(p, &group->list_head) {
2367 s = list_entry(p, subscribers_t, src_list);
2369 s = list_entry(p, subscribers_t, dest_list);
2371 snd_iprintf(buffer, ", ");
2372 snd_iprintf(buffer, "%d:%d",
2373 is_src ? s->info.dest.client : s->info.sender.client,
2374 is_src ? s->info.dest.port : s->info.sender.port);
2375 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2376 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2377 if (group->exclusive)
2378 snd_iprintf(buffer, "[ex]");
2380 up_read(&group->list_mutex);
2381 snd_iprintf(buffer, "\n");
2384 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2385 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2386 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2388 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2390 static void snd_seq_info_dump_ports(snd_info_buffer_t *buffer, client_t *client)
2392 struct list_head *l;
2394 down(&client->ports_mutex);
2395 list_for_each(l, &client->ports_list_head) {
2396 client_port_t *p = list_entry(l, client_port_t, list);
2397 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2398 p->addr.port, p->name,
2399 FLAG_PERM_RD(p->capability),
2400 FLAG_PERM_WR(p->capability),
2401 FLAG_PERM_EX(p->capability),
2402 FLAG_PERM_DUPLEX(p->capability));
2403 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2404 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2406 up(&client->ports_mutex);
2410 /* exported to seq_info.c */
2411 void snd_seq_info_clients_read(snd_info_entry_t *entry,
2412 snd_info_buffer_t * buffer)
2414 extern void snd_seq_info_pool(snd_info_buffer_t * buffer, pool_t * pool, char *space);
2418 snd_iprintf(buffer, "Client info\n");
2419 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2420 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2421 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2422 snd_iprintf(buffer, "\n");
2424 /* list the client table */
2425 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2426 client = snd_seq_client_use_ptr(c);
2429 if (client->type == NO_CLIENT) {
2430 snd_seq_client_unlock(client);
2434 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2436 client->type == USER_CLIENT ? "User" : "Kernel");
2437 snd_seq_info_dump_ports(buffer, client);
2438 if (snd_seq_write_pool_allocated(client)) {
2439 snd_iprintf(buffer, " Output pool :\n");
2440 snd_seq_info_pool(buffer, client->pool, " ");
2442 if (client->type == USER_CLIENT && client->data.user.fifo &&
2443 client->data.user.fifo->pool) {
2444 snd_iprintf(buffer, " Input pool :\n");
2445 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2447 snd_seq_client_unlock(client);
2452 /*---------------------------------------------------------------------------*/
2459 static struct file_operations snd_seq_f_ops =
2461 .owner = THIS_MODULE,
2462 .read = snd_seq_read,
2463 .write = snd_seq_write,
2464 .open = snd_seq_open,
2465 .release = snd_seq_release,
2466 .poll = snd_seq_poll,
2467 .unlocked_ioctl = snd_seq_ioctl,
2468 .compat_ioctl = snd_seq_ioctl_compat,
2471 static snd_minor_t snd_seq_reg =
2473 .comment = "sequencer",
2474 .f_ops = &snd_seq_f_ops,
2479 * register sequencer device
2481 int __init snd_sequencer_device_init(void)
2485 if (down_interruptible(®ister_mutex))
2486 return -ERESTARTSYS;
2488 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, &snd_seq_reg, "seq")) < 0) {
2489 up(®ister_mutex);
2493 up(®ister_mutex);
2501 * unregister sequencer device
2503 void __exit snd_sequencer_device_done(void)
2505 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);