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