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[ALSA] seq: remove struct snd_seq_client_callback
[linux-2.6/zen-sources.git] / sound / core / seq / seq_clientmgr.c
blobbd8c0989785f38500f5b6ffc0881a2be12435c32
1 /*
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>
6 *
7 *
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.
12 *
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.
17 *
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
21 *
22 */
23
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>
31
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"
37 #include "seq_info.h"
38 #include "seq_system.h"
39 #include <sound/seq_device.h>
40 #ifdef CONFIG_COMPAT
41 #include <linux/compat.h>
42 #endif
43
44 /* Client Manager
45
46 * this module handles the connections of userland and kernel clients
47 *
48 */
49
50 /* range for dynamically allocated client numbers of kernel drivers */
51 #define SNDRV_SEQ_DYNAMIC_CLIENT_BEGIN 16
52 #define SNDRV_SEQ_DYNAMIC_CLIENT_END 48
53
54 #define SNDRV_SEQ_LFLG_INPUT 0x0001
55 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
56 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
57
58 static DEFINE_SPINLOCK(clients_lock);
59 static DECLARE_MUTEX(register_mutex);
60
61 /*
62 * client table
63 */
64 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
65 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
66 static struct snd_seq_usage client_usage;
67
68 /*
69 * prototypes
70 */
71 static int bounce_error_event(struct snd_seq_client *client,
72 struct snd_seq_event *event,
73 int err, int atomic, int hop);
74 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
75 struct snd_seq_event *event,
76 int filter, int atomic, int hop);
77
78 /*
79 */
80
81 static inline mm_segment_t snd_enter_user(void)
82 {
83 mm_segment_t fs = get_fs();
84 set_fs(get_ds());
85 return fs;
86 }
87
88 static inline void snd_leave_user(mm_segment_t fs)
89 {
90 set_fs(fs);
91 }
92
93 /*
94 */
95 static inline unsigned short snd_seq_file_flags(struct file *file)
96 {
97 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
98 case FMODE_WRITE:
99 return SNDRV_SEQ_LFLG_OUTPUT;
100 case FMODE_READ:
101 return SNDRV_SEQ_LFLG_INPUT;
102 default:
103 return SNDRV_SEQ_LFLG_OPEN;
104 }
105 }
106
107 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
108 {
109 return snd_seq_total_cells(client->pool) > 0;
110 }
111
112 /* return pointer to client structure for specified id */
113 static struct snd_seq_client *clientptr(int clientid)
114 {
115 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
116 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
117 clientid);
118 return NULL;
119 }
120 return clienttab[clientid];
121 }
122
123 extern int seq_client_load[];
124
125 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
126 {
127 unsigned long flags;
128 struct snd_seq_client *client;
129
130 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
131 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
132 clientid);
133 return NULL;
134 }
135 spin_lock_irqsave(&clients_lock, flags);
136 client = clientptr(clientid);
137 if (client)
138 goto __lock;
139 if (clienttablock[clientid]) {
140 spin_unlock_irqrestore(&clients_lock, flags);
141 return NULL;
142 }
143 spin_unlock_irqrestore(&clients_lock, flags);
144 #ifdef CONFIG_KMOD
145 if (!in_interrupt() && current->fs->root) {
146 static char client_requested[64];
147 static char card_requested[SNDRV_CARDS];
148 if (clientid < 64) {
149 int idx;
150
151 if (! client_requested[clientid] && current->fs->root) {
152 client_requested[clientid] = 1;
153 for (idx = 0; idx < 64; idx++) {
154 if (seq_client_load[idx] < 0)
155 break;
156 if (seq_client_load[idx] == clientid) {
157 request_module("snd-seq-client-%i",
158 clientid);
159 break;
160 }
161 }
162 }
163 } else if (clientid >= 64 && clientid < 128) {
164 int card = (clientid - 64) / 4;
165 if (card < snd_ecards_limit) {
166 if (! card_requested[card]) {
167 card_requested[card] = 1;
168 snd_request_card(card);
169 }
170 snd_seq_device_load_drivers();
171 }
172 }
173 spin_lock_irqsave(&clients_lock, flags);
174 client = clientptr(clientid);
175 if (client)
176 goto __lock;
177 spin_unlock_irqrestore(&clients_lock, flags);
178 }
179 #endif
180 return NULL;
181
182 __lock:
183 snd_use_lock_use(&client->use_lock);
184 spin_unlock_irqrestore(&clients_lock, flags);
185 return client;
186 }
187
188 static void usage_alloc(struct snd_seq_usage *res, int num)
189 {
190 res->cur += num;
191 if (res->cur > res->peak)
192 res->peak = res->cur;
193 }
194
195 static void usage_free(struct snd_seq_usage *res, int num)
196 {
197 res->cur -= num;
198 }
199
200 /* initialise data structures */
201 int __init client_init_data(void)
202 {
203 /* zap out the client table */
204 memset(&clienttablock, 0, sizeof(clienttablock));
205 memset(&clienttab, 0, sizeof(clienttab));
206 return 0;
207 }
208
209
210 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize,
211 int kernel_client)
212 {
213 unsigned long flags;
214 int c;
215 struct snd_seq_client *client;
216
217 /* init client data */
218 client = kzalloc(sizeof(*client), GFP_KERNEL);
219 if (client == NULL)
220 return NULL;
221 client->pool = snd_seq_pool_new(poolsize);
222 if (client->pool == NULL) {
223 kfree(client);
224 return NULL;
225 }
226 client->type = NO_CLIENT;
227 snd_use_lock_init(&client->use_lock);
228 rwlock_init(&client->ports_lock);
229 init_MUTEX(&client->ports_mutex);
230 INIT_LIST_HEAD(&client->ports_list_head);
231
232 /* find free slot in the client table */
233 spin_lock_irqsave(&clients_lock, flags);
234 if (client_index < 0) {
235 int cmin, cmax;
236 if (kernel_client) {
237 cmin = SNDRV_SEQ_DYNAMIC_CLIENT_BEGIN;
238 cmax = SNDRV_SEQ_DYNAMIC_CLIENT_END;
239 } else {
240 cmin = 128;
241 cmax = SNDRV_SEQ_MAX_CLIENTS;
242 }
243 for (c = cmin; c < cmax; c++) {
244 if (clienttab[c] || clienttablock[c])
245 continue;
246 clienttab[client->number = c] = client;
247 spin_unlock_irqrestore(&clients_lock, flags);
248 return client;
249 }
250 } else {
251 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
252 clienttab[client->number = client_index] = client;
253 spin_unlock_irqrestore(&clients_lock, flags);
254 return client;
255 }
256 }
257 spin_unlock_irqrestore(&clients_lock, flags);
258 snd_seq_pool_delete(&client->pool);
259 kfree(client);
260 return NULL; /* no free slot found or busy, return failure code */
261 }
262
263
264 static int seq_free_client1(struct snd_seq_client *client)
265 {
266 unsigned long flags;
267
268 snd_assert(client != NULL, return -EINVAL);
269 snd_seq_delete_all_ports(client);
270 snd_seq_queue_client_leave(client->number);
271 spin_lock_irqsave(&clients_lock, flags);
272 clienttablock[client->number] = 1;
273 clienttab[client->number] = NULL;
274 spin_unlock_irqrestore(&clients_lock, flags);
275 snd_use_lock_sync(&client->use_lock);
276 snd_seq_queue_client_termination(client->number);
277 if (client->pool)
278 snd_seq_pool_delete(&client->pool);
279 spin_lock_irqsave(&clients_lock, flags);
280 clienttablock[client->number] = 0;
281 spin_unlock_irqrestore(&clients_lock, flags);
282 return 0;
283 }
284
285
286 static void seq_free_client(struct snd_seq_client * client)
287 {
288 down(&register_mutex);
289 switch (client->type) {
290 case NO_CLIENT:
291 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
292 client->number);
293 break;
294 case USER_CLIENT:
295 case KERNEL_CLIENT:
296 seq_free_client1(client);
297 usage_free(&client_usage, 1);
298 break;
299
300 default:
301 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
302 client->number, client->type);
303 }
304 up(&register_mutex);
305
306 snd_seq_system_client_ev_client_exit(client->number);
307 }
308
309
310
311 /* -------------------------------------------------------- */
312
313 /* create a user client */
314 static int snd_seq_open(struct inode *inode, struct file *file)
315 {
316 int c, mode; /* client id */
317 struct snd_seq_client *client;
318 struct snd_seq_user_client *user;
319
320 if (down_interruptible(&register_mutex))
321 return -ERESTARTSYS;
322 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS, 0);
323 if (client == NULL) {
324 up(&register_mutex);
325 return -ENOMEM; /* failure code */
326 }
327
328 mode = snd_seq_file_flags(file);
329 if (mode & SNDRV_SEQ_LFLG_INPUT)
330 client->accept_input = 1;
331 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
332 client->accept_output = 1;
333
334 user = &client->data.user;
335 user->fifo = NULL;
336 user->fifo_pool_size = 0;
337
338 if (mode & SNDRV_SEQ_LFLG_INPUT) {
339 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
340 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
341 if (user->fifo == NULL) {
342 seq_free_client1(client);
343 kfree(client);
344 up(&register_mutex);
345 return -ENOMEM;
346 }
347 }
348
349 usage_alloc(&client_usage, 1);
350 client->type = USER_CLIENT;
351 up(&register_mutex);
352
353 c = client->number;
354 file->private_data = client;
355
356 /* fill client data */
357 user->file = file;
358 sprintf(client->name, "Client-%d", c);
359
360 /* make others aware this new client */
361 snd_seq_system_client_ev_client_start(c);
362
363 return 0;
364 }
365
366 /* delete a user client */
367 static int snd_seq_release(struct inode *inode, struct file *file)
368 {
369 struct snd_seq_client *client = file->private_data;
370
371 if (client) {
372 seq_free_client(client);
373 if (client->data.user.fifo)
374 snd_seq_fifo_delete(&client->data.user.fifo);
375 kfree(client);
376 }
377
378 return 0;
379 }
380
381
382 /* handle client read() */
383 /* possible error values:
384 * -ENXIO invalid client or file open mode
385 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
386 * -EINVAL no enough user-space buffer to write the whole event
387 * -EFAULT seg. fault during copy to user space
388 */
389 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
390 loff_t *offset)
391 {
392 struct snd_seq_client *client = file->private_data;
393 struct snd_seq_fifo *fifo;
394 int err;
395 long result = 0;
396 struct snd_seq_event_cell *cell;
397
398 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
399 return -ENXIO;
400
401 if (!access_ok(VERIFY_WRITE, buf, count))
402 return -EFAULT;
403
404 /* check client structures are in place */
405 snd_assert(client != NULL, return -ENXIO);
406
407 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
408 return -ENXIO;
409
410 if (atomic_read(&fifo->overflow) > 0) {
411 /* buffer overflow is detected */
412 snd_seq_fifo_clear(fifo);
413 /* return error code */
414 return -ENOSPC;
415 }
416
417 cell = NULL;
418 err = 0;
419 snd_seq_fifo_lock(fifo);
420
421 /* while data available in queue */
422 while (count >= sizeof(struct snd_seq_event)) {
423 int nonblock;
424
425 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
426 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
427 break;
428 }
429 if (snd_seq_ev_is_variable(&cell->event)) {
430 struct snd_seq_event tmpev;
431 tmpev = cell->event;
432 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
433 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
434 err = -EFAULT;
435 break;
436 }
437 count -= sizeof(struct snd_seq_event);
438 buf += sizeof(struct snd_seq_event);
439 err = snd_seq_expand_var_event(&cell->event, count,
440 (char __force *)buf, 0,
441 sizeof(struct snd_seq_event));
442 if (err < 0)
443 break;
444 result += err;
445 count -= err;
446 buf += err;
447 } else {
448 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
449 err = -EFAULT;
450 break;
451 }
452 count -= sizeof(struct snd_seq_event);
453 buf += sizeof(struct snd_seq_event);
454 }
455 snd_seq_cell_free(cell);
456 cell = NULL; /* to be sure */
457 result += sizeof(struct snd_seq_event);
458 }
459
460 if (err < 0) {
461 if (cell)
462 snd_seq_fifo_cell_putback(fifo, cell);
463 if (err == -EAGAIN && result > 0)
464 err = 0;
465 }
466 snd_seq_fifo_unlock(fifo);
467
468 return (err < 0) ? err : result;
469 }
470
471
472 /*
473 * check access permission to the port
474 */
475 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
476 {
477 if ((port->capability & flags) != flags)
478 return 0;
479 return flags;
480 }
481
482 /*
483 * check if the destination client is available, and return the pointer
484 * if filter is non-zero, client filter bitmap is tested.
485 */
486 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
487 int filter)
488 {
489 struct snd_seq_client *dest;
490
491 dest = snd_seq_client_use_ptr(event->dest.client);
492 if (dest == NULL)
493 return NULL;
494 if (! dest->accept_input)
495 goto __not_avail;
496 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
497 ! test_bit(event->type, dest->event_filter))
498 goto __not_avail;
499 if (filter && !(dest->filter & filter))
500 goto __not_avail;
501
502 return dest; /* ok - accessible */
503 __not_avail:
504 snd_seq_client_unlock(dest);
505 return NULL;
506 }
507
508
509 /*
510 * Return the error event.
511 *
512 * If the receiver client is a user client, the original event is
513 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
514 * the original event is also variable length, the external data is
515 * copied after the event record.
516 * If the receiver client is a kernel client, the original event is
517 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
518 * kmalloc.
519 */
520 static int bounce_error_event(struct snd_seq_client *client,
521 struct snd_seq_event *event,
522 int err, int atomic, int hop)
523 {
524 struct snd_seq_event bounce_ev;
525 int result;
526
527 if (client == NULL ||
528 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
529 ! client->accept_input)
530 return 0; /* ignored */
531
532 /* set up quoted error */
533 memset(&bounce_ev, 0, sizeof(bounce_ev));
534 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
535 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
536 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
537 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
538 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
539 bounce_ev.dest.client = client->number;
540 bounce_ev.dest.port = event->source.port;
541 bounce_ev.data.quote.origin = event->dest;
542 bounce_ev.data.quote.event = event;
543 bounce_ev.data.quote.value = -err; /* use positive value */
544 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
545 if (result < 0) {
546 client->event_lost++;
547 return result;
548 }
549
550 return result;
551 }
552
553
554 /*
555 * rewrite the time-stamp of the event record with the curren time
556 * of the given queue.
557 * return non-zero if updated.
558 */
559 static int update_timestamp_of_queue(struct snd_seq_event *event,
560 int queue, int real_time)
561 {
562 struct snd_seq_queue *q;
563
564 q = queueptr(queue);
565 if (! q)
566 return 0;
567 event->queue = queue;
568 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
569 if (real_time) {
570 event->time.time = snd_seq_timer_get_cur_time(q->timer);
571 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
572 } else {
573 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
574 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
575 }
576 queuefree(q);
577 return 1;
578 }
579
580
581 /*
582 * deliver an event to the specified destination.
583 * if filter is non-zero, client filter bitmap is tested.
584 *
585 * RETURN VALUE: 0 : if succeeded
586 * <0 : error
587 */
588 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
589 struct snd_seq_event *event,
590 int filter, int atomic, int hop)
591 {
592 struct snd_seq_client *dest = NULL;
593 struct snd_seq_client_port *dest_port = NULL;
594 int result = -ENOENT;
595 int direct;
596
597 direct = snd_seq_ev_is_direct(event);
598
599 dest = get_event_dest_client(event, filter);
600 if (dest == NULL)
601 goto __skip;
602 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
603 if (dest_port == NULL)
604 goto __skip;
605
606 /* check permission */
607 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
608 result = -EPERM;
609 goto __skip;
610 }
611
612 if (dest_port->timestamping)
613 update_timestamp_of_queue(event, dest_port->time_queue,
614 dest_port->time_real);
615
616 switch (dest->type) {
617 case USER_CLIENT:
618 if (dest->data.user.fifo)
619 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
620 break;
621
622 case KERNEL_CLIENT:
623 if (dest_port->event_input == NULL)
624 break;
625 result = dest_port->event_input(event, direct,
626 dest_port->private_data,
627 atomic, hop);
628 break;
629 default:
630 break;
631 }
632
633 __skip:
634 if (dest_port)
635 snd_seq_port_unlock(dest_port);
636 if (dest)
637 snd_seq_client_unlock(dest);
638
639 if (result < 0 && !direct) {
640 result = bounce_error_event(client, event, result, atomic, hop);
641 }
642 return result;
643 }
644
645
646 /*
647 * send the event to all subscribers:
648 */
649 static int deliver_to_subscribers(struct snd_seq_client *client,
650 struct snd_seq_event *event,
651 int atomic, int hop)
652 {
653 struct snd_seq_subscribers *subs;
654 int err = 0, num_ev = 0;
655 struct snd_seq_event event_saved;
656 struct snd_seq_client_port *src_port;
657 struct list_head *p;
658 struct snd_seq_port_subs_info *grp;
659
660 src_port = snd_seq_port_use_ptr(client, event->source.port);
661 if (src_port == NULL)
662 return -EINVAL; /* invalid source port */
663 /* save original event record */
664 event_saved = *event;
665 grp = &src_port->c_src;
666
667 /* lock list */
668 if (atomic)
669 read_lock(&grp->list_lock);
670 else
671 down_read(&grp->list_mutex);
672 list_for_each(p, &grp->list_head) {
673 subs = list_entry(p, struct snd_seq_subscribers, src_list);
674 event->dest = subs->info.dest;
675 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
676 /* convert time according to flag with subscription */
677 update_timestamp_of_queue(event, subs->info.queue,
678 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
679 err = snd_seq_deliver_single_event(client, event,
680 0, atomic, hop);
681 if (err < 0)
682 break;
683 num_ev++;
684 /* restore original event record */
685 *event = event_saved;
686 }
687 if (atomic)
688 read_unlock(&grp->list_lock);
689 else
690 up_read(&grp->list_mutex);
691 *event = event_saved; /* restore */
692 snd_seq_port_unlock(src_port);
693 return (err < 0) ? err : num_ev;
694 }
695
696
697 #ifdef SUPPORT_BROADCAST
698 /*
699 * broadcast to all ports:
700 */
701 static int port_broadcast_event(struct snd_seq_client *client,
702 struct snd_seq_event *event,
703 int atomic, int hop)
704 {
705 int num_ev = 0, err = 0;
706 struct snd_seq_client *dest_client;
707 struct list_head *p;
708
709 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
710 if (dest_client == NULL)
711 return 0; /* no matching destination */
712
713 read_lock(&dest_client->ports_lock);
714 list_for_each(p, &dest_client->ports_list_head) {
715 struct snd_seq_client_port *port = list_entry(p, struct snd_seq_client_port, list);
716 event->dest.port = port->addr.port;
717 /* pass NULL as source client to avoid error bounce */
718 err = snd_seq_deliver_single_event(NULL, event,
719 SNDRV_SEQ_FILTER_BROADCAST,
720 atomic, hop);
721 if (err < 0)
722 break;
723 num_ev++;
724 }
725 read_unlock(&dest_client->ports_lock);
726 snd_seq_client_unlock(dest_client);
727 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
728 return (err < 0) ? err : num_ev;
729 }
730
731 /*
732 * send the event to all clients:
733 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
734 */
735 static int broadcast_event(struct snd_seq_client *client,
736 struct snd_seq_event *event, int atomic, int hop)
737 {
738 int err = 0, num_ev = 0;
739 int dest;
740 struct snd_seq_addr addr;
741
742 addr = event->dest; /* save */
743
744 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
745 /* don't send to itself */
746 if (dest == client->number)
747 continue;
748 event->dest.client = dest;
749 event->dest.port = addr.port;
750 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
751 err = port_broadcast_event(client, event, atomic, hop);
752 else
753 /* pass NULL as source client to avoid error bounce */
754 err = snd_seq_deliver_single_event(NULL, event,
755 SNDRV_SEQ_FILTER_BROADCAST,
756 atomic, hop);
757 if (err < 0)
758 break;
759 num_ev += err;
760 }
761 event->dest = addr; /* restore */
762 return (err < 0) ? err : num_ev;
763 }
764
765
766 /* multicast - not supported yet */
767 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
768 int atomic, int hop)
769 {
770 snd_printd("seq: multicast not supported yet.\n");
771 return 0; /* ignored */
772 }
773 #endif /* SUPPORT_BROADCAST */
774
775
776 /* deliver an event to the destination port(s).
777 * if the event is to subscribers or broadcast, the event is dispatched
778 * to multiple targets.
779 *
780 * RETURN VALUE: n > 0 : the number of delivered events.
781 * n == 0 : the event was not passed to any client.
782 * n < 0 : error - event was not processed.
783 */
784 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
785 int atomic, int hop)
786 {
787 int result;
788
789 hop++;
790 if (hop >= SNDRV_SEQ_MAX_HOPS) {
791 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
792 event->source.client, event->source.port,
793 event->dest.client, event->dest.port);
794 return -EMLINK;
795 }
796
797 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
798 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
799 result = deliver_to_subscribers(client, event, atomic, hop);
800 #ifdef SUPPORT_BROADCAST
801 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
802 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
803 result = broadcast_event(client, event, atomic, hop);
804 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
805 result = multicast_event(client, event, atomic, hop);
806 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
807 result = port_broadcast_event(client, event, atomic, hop);
808 #endif
809 else
810 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
811
812 return result;
813 }
814
815 /*
816 * dispatch an event cell:
817 * This function is called only from queue check routines in timer
818 * interrupts or after enqueued.
819 * The event cell shall be released or re-queued in this function.
820 *
821 * RETURN VALUE: n > 0 : the number of delivered events.
822 * n == 0 : the event was not passed to any client.
823 * n < 0 : error - event was not processed.
824 */
825 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
826 {
827 struct snd_seq_client *client;
828 int result;
829
830 snd_assert(cell != NULL, return -EINVAL);
831
832 client = snd_seq_client_use_ptr(cell->event.source.client);
833 if (client == NULL) {
834 snd_seq_cell_free(cell); /* release this cell */
835 return -EINVAL;
836 }
837
838 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
839 /* NOTE event:
840 * the event cell is re-used as a NOTE-OFF event and
841 * enqueued again.
842 */
843 struct snd_seq_event tmpev, *ev;
844
845 /* reserve this event to enqueue note-off later */
846 tmpev = cell->event;
847 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
848 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
849
850 /*
851 * This was originally a note event. We now re-use the
852 * cell for the note-off event.
853 */
854
855 ev = &cell->event;
856 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
857 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
858
859 /* add the duration time */
860 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
861 case SNDRV_SEQ_TIME_STAMP_TICK:
862 ev->time.tick += ev->data.note.duration;
863 break;
864 case SNDRV_SEQ_TIME_STAMP_REAL:
865 /* unit for duration is ms */
866 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
867 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
868 ev->time.time.tv_nsec / 1000000000;
869 ev->time.time.tv_nsec %= 1000000000;
870 break;
871 }
872 ev->data.note.velocity = ev->data.note.off_velocity;
873
874 /* Now queue this cell as the note off event */
875 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
876 snd_seq_cell_free(cell); /* release this cell */
877
878 } else {
879 /* Normal events:
880 * event cell is freed after processing the event
881 */
882
883 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
884 snd_seq_cell_free(cell);
885 }
886
887 snd_seq_client_unlock(client);
888 return result;
889 }
890
891
892 /* Allocate a cell from client pool and enqueue it to queue:
893 * if pool is empty and blocking is TRUE, sleep until a new cell is
894 * available.
895 */
896 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
897 struct snd_seq_event *event,
898 struct file *file, int blocking,
899 int atomic, int hop)
900 {
901 struct snd_seq_event_cell *cell;
902 int err;
903
904 /* special queue values - force direct passing */
905 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
906 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
907 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
908 } else
909 #ifdef SUPPORT_BROADCAST
910 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
911 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
912 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
913 }
914 #endif
915 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
916 /* check presence of source port */
917 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
918 if (src_port == NULL)
919 return -EINVAL;
920 snd_seq_port_unlock(src_port);
921 }
922
923 /* direct event processing without enqueued */
924 if (snd_seq_ev_is_direct(event)) {
925 if (event->type == SNDRV_SEQ_EVENT_NOTE)
926 return -EINVAL; /* this event must be enqueued! */
927 return snd_seq_deliver_event(client, event, atomic, hop);
928 }
929
930 /* Not direct, normal queuing */
931 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
932 return -EINVAL; /* invalid queue */
933 if (! snd_seq_write_pool_allocated(client))
934 return -ENXIO; /* queue is not allocated */
935
936 /* allocate an event cell */
937 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
938 if (err < 0)
939 return err;
940
941 /* we got a cell. enqueue it. */
942 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
943 snd_seq_cell_free(cell);
944 return err;
945 }
946
947 return 0;
948 }
949
950
951 /*
952 * check validity of event type and data length.
953 * return non-zero if invalid.
954 */
955 static int check_event_type_and_length(struct snd_seq_event *ev)
956 {
957 switch (snd_seq_ev_length_type(ev)) {
958 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
959 if (snd_seq_ev_is_variable_type(ev))
960 return -EINVAL;
961 break;
962 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
963 if (! snd_seq_ev_is_variable_type(ev) ||
964 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
965 return -EINVAL;
966 break;
967 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
968 if (! snd_seq_ev_is_instr_type(ev) ||
969 ! snd_seq_ev_is_direct(ev))
970 return -EINVAL;
971 break;
972 }
973 return 0;
974 }
975
976
977 /* handle write() */
978 /* possible error values:
979 * -ENXIO invalid client or file open mode
980 * -ENOMEM malloc failed
981 * -EFAULT seg. fault during copy from user space
982 * -EINVAL invalid event
983 * -EAGAIN no space in output pool
984 * -EINTR interrupts while sleep
985 * -EMLINK too many hops
986 * others depends on return value from driver callback
987 */
988 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
989 size_t count, loff_t *offset)
990 {
991 struct snd_seq_client *client = file->private_data;
992 int written = 0, len;
993 int err = -EINVAL;
994 struct snd_seq_event event;
995
996 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
997 return -ENXIO;
998
999 /* check client structures are in place */
1000 snd_assert(client != NULL, return -ENXIO);
1001
1002 if (!client->accept_output || client->pool == NULL)
1003 return -ENXIO;
1004
1005 /* allocate the pool now if the pool is not allocated yet */
1006 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1007 if (snd_seq_pool_init(client->pool) < 0)
1008 return -ENOMEM;
1009 }
1010
1011 /* only process whole events */
1012 while (count >= sizeof(struct snd_seq_event)) {
1013 /* Read in the event header from the user */
1014 len = sizeof(event);
1015 if (copy_from_user(&event, buf, len)) {
1016 err = -EFAULT;
1017 break;
1018 }
1019 event.source.client = client->number; /* fill in client number */
1020 /* Check for extension data length */
1021 if (check_event_type_and_length(&event)) {
1022 err = -EINVAL;
1023 break;
1024 }
1025
1026 /* check for special events */
1027 if (event.type == SNDRV_SEQ_EVENT_NONE)
1028 goto __skip_event;
1029 else if (snd_seq_ev_is_reserved(&event)) {
1030 err = -EINVAL;
1031 break;
1032 }
1033
1034 if (snd_seq_ev_is_variable(&event)) {
1035 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1036 if ((size_t)(extlen + len) > count) {
1037 /* back out, will get an error this time or next */
1038 err = -EINVAL;
1039 break;
1040 }
1041 /* set user space pointer */
1042 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1043 event.data.ext.ptr = (char __force *)buf
1044 + sizeof(struct snd_seq_event);
1045 len += extlen; /* increment data length */
1046 } else {
1047 #ifdef CONFIG_COMPAT
1048 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1049 void *ptr = compat_ptr(event.data.raw32.d[1]);
1050 event.data.ext.ptr = ptr;
1051 }
1052 #endif
1053 }
1054
1055 /* ok, enqueue it */
1056 err = snd_seq_client_enqueue_event(client, &event, file,
1057 !(file->f_flags & O_NONBLOCK),
1058 0, 0);
1059 if (err < 0)
1060 break;
1061
1062 __skip_event:
1063 /* Update pointers and counts */
1064 count -= len;
1065 buf += len;
1066 written += len;
1067 }
1068
1069 return written ? written : err;
1070 }
1071
1072
1073 /*
1074 * handle polling
1075 */
1076 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1077 {
1078 struct snd_seq_client *client = file->private_data;
1079 unsigned int mask = 0;
1080
1081 /* check client structures are in place */
1082 snd_assert(client != NULL, return -ENXIO);
1083
1084 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1085 client->data.user.fifo) {
1086
1087 /* check if data is available in the outqueue */
1088 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1089 mask |= POLLIN | POLLRDNORM;
1090 }
1091
1092 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1093
1094 /* check if data is available in the pool */
1095 if (!snd_seq_write_pool_allocated(client) ||
1096 snd_seq_pool_poll_wait(client->pool, file, wait))
1097 mask |= POLLOUT | POLLWRNORM;
1098 }
1099
1100 return mask;
1101 }
1102
1103
1104 /*-----------------------------------------------------*/
1105
1106
1107 /* SYSTEM_INFO ioctl() */
1108 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1109 {
1110 struct snd_seq_system_info info;
1111
1112 memset(&info, 0, sizeof(info));
1113 /* fill the info fields */
1114 info.queues = SNDRV_SEQ_MAX_QUEUES;
1115 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1116 info.ports = 256; /* fixed limit */
1117 info.channels = 256; /* fixed limit */
1118 info.cur_clients = client_usage.cur;
1119 info.cur_queues = snd_seq_queue_get_cur_queues();
1120
1121 if (copy_to_user(arg, &info, sizeof(info)))
1122 return -EFAULT;
1123 return 0;
1124 }
1125
1126
1127 /* RUNNING_MODE ioctl() */
1128 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1129 {
1130 struct snd_seq_running_info info;
1131 struct snd_seq_client *cptr;
1132 int err = 0;
1133
1134 if (copy_from_user(&info, arg, sizeof(info)))
1135 return -EFAULT;
1136
1137 /* requested client number */
1138 cptr = snd_seq_client_use_ptr(info.client);
1139 if (cptr == NULL)
1140 return -ENOENT; /* don't change !!! */
1141
1142 #ifdef SNDRV_BIG_ENDIAN
1143 if (! info.big_endian) {
1144 err = -EINVAL;
1145 goto __err;
1146 }
1147 #else
1148 if (info.big_endian) {
1149 err = -EINVAL;
1150 goto __err;
1151 }
1152
1153 #endif
1154 if (info.cpu_mode > sizeof(long)) {
1155 err = -EINVAL;
1156 goto __err;
1157 }
1158 cptr->convert32 = (info.cpu_mode < sizeof(long));
1159 __err:
1160 snd_seq_client_unlock(cptr);
1161 return err;
1162 }
1163
1164 /* CLIENT_INFO ioctl() */
1165 static void get_client_info(struct snd_seq_client *cptr,
1166 struct snd_seq_client_info *info)
1167 {
1168 info->client = cptr->number;
1169
1170 /* fill the info fields */
1171 info->type = cptr->type;
1172 strcpy(info->name, cptr->name);
1173 info->filter = cptr->filter;
1174 info->event_lost = cptr->event_lost;
1175 memcpy(info->event_filter, cptr->event_filter, 32);
1176 info->num_ports = cptr->num_ports;
1177 memset(info->reserved, 0, sizeof(info->reserved));
1178 }
1179
1180 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1181 void __user *arg)
1182 {
1183 struct snd_seq_client *cptr;
1184 struct snd_seq_client_info client_info;
1185
1186 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1187 return -EFAULT;
1188
1189 /* requested client number */
1190 cptr = snd_seq_client_use_ptr(client_info.client);
1191 if (cptr == NULL)
1192 return -ENOENT; /* don't change !!! */
1193
1194 get_client_info(cptr, &client_info);
1195 snd_seq_client_unlock(cptr);
1196
1197 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1198 return -EFAULT;
1199 return 0;
1200 }
1201
1202
1203 /* CLIENT_INFO ioctl() */
1204 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1205 void __user *arg)
1206 {
1207 struct snd_seq_client_info client_info;
1208
1209 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1210 return -EFAULT;
1211
1212 /* it is not allowed to set the info fields for an another client */
1213 if (client->number != client_info.client)
1214 return -EPERM;
1215 /* also client type must be set now */
1216 if (client->type != client_info.type)
1217 return -EINVAL;
1218
1219 /* fill the info fields */
1220 if (client_info.name[0])
1221 strlcpy(client->name, client_info.name, sizeof(client->name));
1222
1223 client->filter = client_info.filter;
1224 client->event_lost = client_info.event_lost;
1225 memcpy(client->event_filter, client_info.event_filter, 32);
1226
1227 return 0;
1228 }
1229
1230
1231 /*
1232 * CREATE PORT ioctl()
1233 */
1234 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1235 void __user *arg)
1236 {
1237 struct snd_seq_client_port *port;
1238 struct snd_seq_port_info info;
1239 struct snd_seq_port_callback *callback;
1240
1241 if (copy_from_user(&info, arg, sizeof(info)))
1242 return -EFAULT;
1243
1244 /* it is not allowed to create the port for an another client */
1245 if (info.addr.client != client->number)
1246 return -EPERM;
1247
1248 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1249 if (port == NULL)
1250 return -ENOMEM;
1251
1252 if (client->type == USER_CLIENT && info.kernel) {
1253 snd_seq_delete_port(client, port->addr.port);
1254 return -EINVAL;
1255 }
1256 if (client->type == KERNEL_CLIENT) {
1257 if ((callback = info.kernel) != NULL) {
1258 if (callback->owner)
1259 port->owner = callback->owner;
1260 port->private_data = callback->private_data;
1261 port->private_free = callback->private_free;
1262 port->callback_all = callback->callback_all;
1263 port->event_input = callback->event_input;
1264 port->c_src.open = callback->subscribe;
1265 port->c_src.close = callback->unsubscribe;
1266 port->c_dest.open = callback->use;
1267 port->c_dest.close = callback->unuse;
1268 }
1269 }
1270
1271 info.addr = port->addr;
1272
1273 snd_seq_set_port_info(port, &info);
1274 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1275
1276 if (copy_to_user(arg, &info, sizeof(info)))
1277 return -EFAULT;
1278
1279 return 0;
1280 }
1281
1282 /*
1283 * DELETE PORT ioctl()
1284 */
1285 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1286 void __user *arg)
1287 {
1288 struct snd_seq_port_info info;
1289 int err;
1290
1291 /* set passed parameters */
1292 if (copy_from_user(&info, arg, sizeof(info)))
1293 return -EFAULT;
1294
1295 /* it is not allowed to remove the port for an another client */
1296 if (info.addr.client != client->number)
1297 return -EPERM;
1298
1299 err = snd_seq_delete_port(client, info.addr.port);
1300 if (err >= 0)
1301 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1302 return err;
1303 }
1304
1305
1306 /*
1307 * GET_PORT_INFO ioctl() (on any client)
1308 */
1309 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1310 void __user *arg)
1311 {
1312 struct snd_seq_client *cptr;
1313 struct snd_seq_client_port *port;
1314 struct snd_seq_port_info info;
1315
1316 if (copy_from_user(&info, arg, sizeof(info)))
1317 return -EFAULT;
1318 cptr = snd_seq_client_use_ptr(info.addr.client);
1319 if (cptr == NULL)
1320 return -ENXIO;
1321
1322 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1323 if (port == NULL) {
1324 snd_seq_client_unlock(cptr);
1325 return -ENOENT; /* don't change */
1326 }
1327
1328 /* get port info */
1329 snd_seq_get_port_info(port, &info);
1330 snd_seq_port_unlock(port);
1331 snd_seq_client_unlock(cptr);
1332
1333 if (copy_to_user(arg, &info, sizeof(info)))
1334 return -EFAULT;
1335 return 0;
1336 }
1337
1338
1339 /*
1340 * SET_PORT_INFO ioctl() (only ports on this/own client)
1341 */
1342 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1343 void __user *arg)
1344 {
1345 struct snd_seq_client_port *port;
1346 struct snd_seq_port_info info;
1347
1348 if (copy_from_user(&info, arg, sizeof(info)))
1349 return -EFAULT;
1350
1351 if (info.addr.client != client->number) /* only set our own ports ! */
1352 return -EPERM;
1353 port = snd_seq_port_use_ptr(client, info.addr.port);
1354 if (port) {
1355 snd_seq_set_port_info(port, &info);
1356 snd_seq_port_unlock(port);
1357 }
1358 return 0;
1359 }
1360
1361
1362 /*
1363 * port subscription (connection)
1364 */
1365 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1366 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1367
1368 static int check_subscription_permission(struct snd_seq_client *client,
1369 struct snd_seq_client_port *sport,
1370 struct snd_seq_client_port *dport,
1371 struct snd_seq_port_subscribe *subs)
1372 {
1373 if (client->number != subs->sender.client &&
1374 client->number != subs->dest.client) {
1375 /* connection by third client - check export permission */
1376 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1377 return -EPERM;
1378 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1379 return -EPERM;
1380 }
1381
1382 /* check read permission */
1383 /* if sender or receiver is the subscribing client itself,
1384 * no permission check is necessary
1385 */
1386 if (client->number != subs->sender.client) {
1387 if (! check_port_perm(sport, PERM_RD))
1388 return -EPERM;
1389 }
1390 /* check write permission */
1391 if (client->number != subs->dest.client) {
1392 if (! check_port_perm(dport, PERM_WR))
1393 return -EPERM;
1394 }
1395 return 0;
1396 }
1397
1398 /*
1399 * send an subscription notify event to user client:
1400 * client must be user client.
1401 */
1402 int snd_seq_client_notify_subscription(int client, int port,
1403 struct snd_seq_port_subscribe *info,
1404 int evtype)
1405 {
1406 struct snd_seq_event event;
1407
1408 memset(&event, 0, sizeof(event));
1409 event.type = evtype;
1410 event.data.connect.dest = info->dest;
1411 event.data.connect.sender = info->sender;
1412
1413 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1414 }
1415
1416
1417 /*
1418 * add to port's subscription list IOCTL interface
1419 */
1420 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1421 void __user *arg)
1422 {
1423 int result = -EINVAL;
1424 struct snd_seq_client *receiver = NULL, *sender = NULL;
1425 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1426 struct snd_seq_port_subscribe subs;
1427
1428 if (copy_from_user(&subs, arg, sizeof(subs)))
1429 return -EFAULT;
1430
1431 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1432 goto __end;
1433 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1434 goto __end;
1435 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1436 goto __end;
1437 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1438 goto __end;
1439
1440 result = check_subscription_permission(client, sport, dport, &subs);
1441 if (result < 0)
1442 goto __end;
1443
1444 /* connect them */
1445 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1446 if (! result) /* broadcast announce */
1447 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1448 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1449 __end:
1450 if (sport)
1451 snd_seq_port_unlock(sport);
1452 if (dport)
1453 snd_seq_port_unlock(dport);
1454 if (sender)
1455 snd_seq_client_unlock(sender);
1456 if (receiver)
1457 snd_seq_client_unlock(receiver);
1458 return result;
1459 }
1460
1461
1462 /*
1463 * remove from port's subscription list
1464 */
1465 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1466 void __user *arg)
1467 {
1468 int result = -ENXIO;
1469 struct snd_seq_client *receiver = NULL, *sender = NULL;
1470 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1471 struct snd_seq_port_subscribe subs;
1472
1473 if (copy_from_user(&subs, arg, sizeof(subs)))
1474 return -EFAULT;
1475
1476 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1477 goto __end;
1478 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1479 goto __end;
1480 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1481 goto __end;
1482 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1483 goto __end;
1484
1485 result = check_subscription_permission(client, sport, dport, &subs);
1486 if (result < 0)
1487 goto __end;
1488
1489 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1490 if (! result) /* broadcast announce */
1491 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1492 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1493 __end:
1494 if (sport)
1495 snd_seq_port_unlock(sport);
1496 if (dport)
1497 snd_seq_port_unlock(dport);
1498 if (sender)
1499 snd_seq_client_unlock(sender);
1500 if (receiver)
1501 snd_seq_client_unlock(receiver);
1502 return result;
1503 }
1504
1505
1506 /* CREATE_QUEUE ioctl() */
1507 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1508 void __user *arg)
1509 {
1510 struct snd_seq_queue_info info;
1511 int result;
1512 struct snd_seq_queue *q;
1513
1514 if (copy_from_user(&info, arg, sizeof(info)))
1515 return -EFAULT;
1516
1517 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1518 if (result < 0)
1519 return result;
1520
1521 q = queueptr(result);
1522 if (q == NULL)
1523 return -EINVAL;
1524
1525 info.queue = q->queue;
1526 info.locked = q->locked;
1527 info.owner = q->owner;
1528
1529 /* set queue name */
1530 if (! info.name[0])
1531 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1532 strlcpy(q->name, info.name, sizeof(q->name));
1533 queuefree(q);
1534
1535 if (copy_to_user(arg, &info, sizeof(info)))
1536 return -EFAULT;
1537
1538 return 0;
1539 }
1540
1541 /* DELETE_QUEUE ioctl() */
1542 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1543 void __user *arg)
1544 {
1545 struct snd_seq_queue_info info;
1546
1547 if (copy_from_user(&info, arg, sizeof(info)))
1548 return -EFAULT;
1549
1550 return snd_seq_queue_delete(client->number, info.queue);
1551 }
1552
1553 /* GET_QUEUE_INFO ioctl() */
1554 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1555 void __user *arg)
1556 {
1557 struct snd_seq_queue_info info;
1558 struct snd_seq_queue *q;
1559
1560 if (copy_from_user(&info, arg, sizeof(info)))
1561 return -EFAULT;
1562
1563 q = queueptr(info.queue);
1564 if (q == NULL)
1565 return -EINVAL;
1566
1567 memset(&info, 0, sizeof(info));
1568 info.queue = q->queue;
1569 info.owner = q->owner;
1570 info.locked = q->locked;
1571 strlcpy(info.name, q->name, sizeof(info.name));
1572 queuefree(q);
1573
1574 if (copy_to_user(arg, &info, sizeof(info)))
1575 return -EFAULT;
1576
1577 return 0;
1578 }
1579
1580 /* SET_QUEUE_INFO ioctl() */
1581 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1582 void __user *arg)
1583 {
1584 struct snd_seq_queue_info info;
1585 struct snd_seq_queue *q;
1586
1587 if (copy_from_user(&info, arg, sizeof(info)))
1588 return -EFAULT;
1589
1590 if (info.owner != client->number)
1591 return -EINVAL;
1592
1593 /* change owner/locked permission */
1594 if (snd_seq_queue_check_access(info.queue, client->number)) {
1595 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1596 return -EPERM;
1597 if (info.locked)
1598 snd_seq_queue_use(info.queue, client->number, 1);
1599 } else {
1600 return -EPERM;
1601 }
1602
1603 q = queueptr(info.queue);
1604 if (! q)
1605 return -EINVAL;
1606 if (q->owner != client->number) {
1607 queuefree(q);
1608 return -EPERM;
1609 }
1610 strlcpy(q->name, info.name, sizeof(q->name));
1611 queuefree(q);
1612
1613 return 0;
1614 }
1615
1616 /* GET_NAMED_QUEUE ioctl() */
1617 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1618 {
1619 struct snd_seq_queue_info info;
1620 struct snd_seq_queue *q;
1621
1622 if (copy_from_user(&info, arg, sizeof(info)))
1623 return -EFAULT;
1624
1625 q = snd_seq_queue_find_name(info.name);
1626 if (q == NULL)
1627 return -EINVAL;
1628 info.queue = q->queue;
1629 info.owner = q->owner;
1630 info.locked = q->locked;
1631 queuefree(q);
1632
1633 if (copy_to_user(arg, &info, sizeof(info)))
1634 return -EFAULT;
1635
1636 return 0;
1637 }
1638
1639 /* GET_QUEUE_STATUS ioctl() */
1640 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1641 void __user *arg)
1642 {
1643 struct snd_seq_queue_status status;
1644 struct snd_seq_queue *queue;
1645 struct snd_seq_timer *tmr;
1646
1647 if (copy_from_user(&status, arg, sizeof(status)))
1648 return -EFAULT;
1649
1650 queue = queueptr(status.queue);
1651 if (queue == NULL)
1652 return -EINVAL;
1653 memset(&status, 0, sizeof(status));
1654 status.queue = queue->queue;
1655
1656 tmr = queue->timer;
1657 status.events = queue->tickq->cells + queue->timeq->cells;
1658
1659 status.time = snd_seq_timer_get_cur_time(tmr);
1660 status.tick = snd_seq_timer_get_cur_tick(tmr);
1661
1662 status.running = tmr->running;
1663
1664 status.flags = queue->flags;
1665 queuefree(queue);
1666
1667 if (copy_to_user(arg, &status, sizeof(status)))
1668 return -EFAULT;
1669 return 0;
1670 }
1671
1672
1673 /* GET_QUEUE_TEMPO ioctl() */
1674 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1675 void __user *arg)
1676 {
1677 struct snd_seq_queue_tempo tempo;
1678 struct snd_seq_queue *queue;
1679 struct snd_seq_timer *tmr;
1680
1681 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1682 return -EFAULT;
1683
1684 queue = queueptr(tempo.queue);
1685 if (queue == NULL)
1686 return -EINVAL;
1687 memset(&tempo, 0, sizeof(tempo));
1688 tempo.queue = queue->queue;
1689
1690 tmr = queue->timer;
1691
1692 tempo.tempo = tmr->tempo;
1693 tempo.ppq = tmr->ppq;
1694 tempo.skew_value = tmr->skew;
1695 tempo.skew_base = tmr->skew_base;
1696 queuefree(queue);
1697
1698 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1699 return -EFAULT;
1700 return 0;
1701 }
1702
1703
1704 /* SET_QUEUE_TEMPO ioctl() */
1705 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1706 {
1707 if (!snd_seq_queue_check_access(tempo->queue, client))
1708 return -EPERM;
1709 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1710 }
1711
1712 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1713 void __user *arg)
1714 {
1715 int result;
1716 struct snd_seq_queue_tempo tempo;
1717
1718 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1719 return -EFAULT;
1720
1721 result = snd_seq_set_queue_tempo(client->number, &tempo);
1722 return result < 0 ? result : 0;
1723 }
1724
1725
1726 /* GET_QUEUE_TIMER ioctl() */
1727 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1728 void __user *arg)
1729 {
1730 struct snd_seq_queue_timer timer;
1731 struct snd_seq_queue *queue;
1732 struct snd_seq_timer *tmr;
1733
1734 if (copy_from_user(&timer, arg, sizeof(timer)))
1735 return -EFAULT;
1736
1737 queue = queueptr(timer.queue);
1738 if (queue == NULL)
1739 return -EINVAL;
1740
1741 if (down_interruptible(&queue->timer_mutex)) {
1742 queuefree(queue);
1743 return -ERESTARTSYS;
1744 }
1745 tmr = queue->timer;
1746 memset(&timer, 0, sizeof(timer));
1747 timer.queue = queue->queue;
1748
1749 timer.type = tmr->type;
1750 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1751 timer.u.alsa.id = tmr->alsa_id;
1752 timer.u.alsa.resolution = tmr->preferred_resolution;
1753 }
1754 up(&queue->timer_mutex);
1755 queuefree(queue);
1756
1757 if (copy_to_user(arg, &timer, sizeof(timer)))
1758 return -EFAULT;
1759 return 0;
1760 }
1761
1762
1763 /* SET_QUEUE_TIMER ioctl() */
1764 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1765 void __user *arg)
1766 {
1767 int result = 0;
1768 struct snd_seq_queue_timer timer;
1769
1770 if (copy_from_user(&timer, arg, sizeof(timer)))
1771 return -EFAULT;
1772
1773 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1774 return -EINVAL;
1775
1776 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1777 struct snd_seq_queue *q;
1778 struct snd_seq_timer *tmr;
1779
1780 q = queueptr(timer.queue);
1781 if (q == NULL)
1782 return -ENXIO;
1783 if (down_interruptible(&q->timer_mutex)) {
1784 queuefree(q);
1785 return -ERESTARTSYS;
1786 }
1787 tmr = q->timer;
1788 snd_seq_queue_timer_close(timer.queue);
1789 tmr->type = timer.type;
1790 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1791 tmr->alsa_id = timer.u.alsa.id;
1792 tmr->preferred_resolution = timer.u.alsa.resolution;
1793 }
1794 result = snd_seq_queue_timer_open(timer.queue);
1795 up(&q->timer_mutex);
1796 queuefree(q);
1797 } else {
1798 return -EPERM;
1799 }
1800
1801 return result;
1802 }
1803
1804
1805 /* GET_QUEUE_CLIENT ioctl() */
1806 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1807 void __user *arg)
1808 {
1809 struct snd_seq_queue_client info;
1810 int used;
1811
1812 if (copy_from_user(&info, arg, sizeof(info)))
1813 return -EFAULT;
1814
1815 used = snd_seq_queue_is_used(info.queue, client->number);
1816 if (used < 0)
1817 return -EINVAL;
1818 info.used = used;
1819 info.client = client->number;
1820
1821 if (copy_to_user(arg, &info, sizeof(info)))
1822 return -EFAULT;
1823 return 0;
1824 }
1825
1826
1827 /* SET_QUEUE_CLIENT ioctl() */
1828 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1829 void __user *arg)
1830 {
1831 int err;
1832 struct snd_seq_queue_client info;
1833
1834 if (copy_from_user(&info, arg, sizeof(info)))
1835 return -EFAULT;
1836
1837 if (info.used >= 0) {
1838 err = snd_seq_queue_use(info.queue, client->number, info.used);
1839 if (err < 0)
1840 return err;
1841 }
1842
1843 return snd_seq_ioctl_get_queue_client(client, arg);
1844 }
1845
1846
1847 /* GET_CLIENT_POOL ioctl() */
1848 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1849 void __user *arg)
1850 {
1851 struct snd_seq_client_pool info;
1852 struct snd_seq_client *cptr;
1853
1854 if (copy_from_user(&info, arg, sizeof(info)))
1855 return -EFAULT;
1856
1857 cptr = snd_seq_client_use_ptr(info.client);
1858 if (cptr == NULL)
1859 return -ENOENT;
1860 memset(&info, 0, sizeof(info));
1861 info.output_pool = cptr->pool->size;
1862 info.output_room = cptr->pool->room;
1863 info.output_free = info.output_pool;
1864 if (cptr->pool)
1865 info.output_free = snd_seq_unused_cells(cptr->pool);
1866 if (cptr->type == USER_CLIENT) {
1867 info.input_pool = cptr->data.user.fifo_pool_size;
1868 info.input_free = info.input_pool;
1869 if (cptr->data.user.fifo)
1870 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1871 } else {
1872 info.input_pool = 0;
1873 info.input_free = 0;
1874 }
1875 snd_seq_client_unlock(cptr);
1876
1877 if (copy_to_user(arg, &info, sizeof(info)))
1878 return -EFAULT;
1879 return 0;
1880 }
1881
1882 /* SET_CLIENT_POOL ioctl() */
1883 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1884 void __user *arg)
1885 {
1886 struct snd_seq_client_pool info;
1887 int rc;
1888
1889 if (copy_from_user(&info, arg, sizeof(info)))
1890 return -EFAULT;
1891
1892 if (client->number != info.client)
1893 return -EINVAL; /* can't change other clients */
1894
1895 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1896 (! snd_seq_write_pool_allocated(client) ||
1897 info.output_pool != client->pool->size)) {
1898 if (snd_seq_write_pool_allocated(client)) {
1899 /* remove all existing cells */
1900 snd_seq_queue_client_leave_cells(client->number);
1901 snd_seq_pool_done(client->pool);
1902 }
1903 client->pool->size = info.output_pool;
1904 rc = snd_seq_pool_init(client->pool);
1905 if (rc < 0)
1906 return rc;
1907 }
1908 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1909 info.input_pool >= 1 &&
1910 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1911 info.input_pool != client->data.user.fifo_pool_size) {
1912 /* change pool size */
1913 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1914 if (rc < 0)
1915 return rc;
1916 client->data.user.fifo_pool_size = info.input_pool;
1917 }
1918 if (info.output_room >= 1 &&
1919 info.output_room <= client->pool->size) {
1920 client->pool->room = info.output_room;
1921 }
1922
1923 return snd_seq_ioctl_get_client_pool(client, arg);
1924 }
1925
1926
1927 /* REMOVE_EVENTS ioctl() */
1928 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1929 void __user *arg)
1930 {
1931 struct snd_seq_remove_events info;
1932
1933 if (copy_from_user(&info, arg, sizeof(info)))
1934 return -EFAULT;
1935
1936 /*
1937 * Input mostly not implemented XXX.
1938 */
1939 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1940 /*
1941 * No restrictions so for a user client we can clear
1942 * the whole fifo
1943 */
1944 if (client->type == USER_CLIENT)
1945 snd_seq_fifo_clear(client->data.user.fifo);
1946 }
1947
1948 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1949 snd_seq_queue_remove_cells(client->number, &info);
1950
1951 return 0;
1952 }
1953
1954
1955 /*
1956 * get subscription info
1957 */
1958 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1959 void __user *arg)
1960 {
1961 int result;
1962 struct snd_seq_client *sender = NULL;
1963 struct snd_seq_client_port *sport = NULL;
1964 struct snd_seq_port_subscribe subs;
1965 struct snd_seq_subscribers *p;
1966
1967 if (copy_from_user(&subs, arg, sizeof(subs)))
1968 return -EFAULT;
1969
1970 result = -EINVAL;
1971 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1972 goto __end;
1973 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1974 goto __end;
1975 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1976 if (p) {
1977 result = 0;
1978 subs = p->info;
1979 } else
1980 result = -ENOENT;
1981
1982 __end:
1983 if (sport)
1984 snd_seq_port_unlock(sport);
1985 if (sender)
1986 snd_seq_client_unlock(sender);
1987 if (result >= 0) {
1988 if (copy_to_user(arg, &subs, sizeof(subs)))
1989 return -EFAULT;
1990 }
1991 return result;
1992 }
1993
1994
1995 /*
1996 * get subscription info - check only its presence
1997 */
1998 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
1999 void __user *arg)
2000 {
2001 int result = -ENXIO;
2002 struct snd_seq_client *cptr = NULL;
2003 struct snd_seq_client_port *port = NULL;
2004 struct snd_seq_query_subs subs;
2005 struct snd_seq_port_subs_info *group;
2006 struct list_head *p;
2007 int i;
2008
2009 if (copy_from_user(&subs, arg, sizeof(subs)))
2010 return -EFAULT;
2011
2012 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2013 goto __end;
2014 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2015 goto __end;
2016
2017 switch (subs.type) {
2018 case SNDRV_SEQ_QUERY_SUBS_READ:
2019 group = &port->c_src;
2020 break;
2021 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2022 group = &port->c_dest;
2023 break;
2024 default:
2025 goto __end;
2026 }
2027
2028 down_read(&group->list_mutex);
2029 /* search for the subscriber */
2030 subs.num_subs = group->count;
2031 i = 0;
2032 result = -ENOENT;
2033 list_for_each(p, &group->list_head) {
2034 if (i++ == subs.index) {
2035 /* found! */
2036 struct snd_seq_subscribers *s;
2037 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2038 s = list_entry(p, struct snd_seq_subscribers, src_list);
2039 subs.addr = s->info.dest;
2040 } else {
2041 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2042 subs.addr = s->info.sender;
2043 }
2044 subs.flags = s->info.flags;
2045 subs.queue = s->info.queue;
2046 result = 0;
2047 break;
2048 }
2049 }
2050 up_read(&group->list_mutex);
2051
2052 __end:
2053 if (port)
2054 snd_seq_port_unlock(port);
2055 if (cptr)
2056 snd_seq_client_unlock(cptr);
2057 if (result >= 0) {
2058 if (copy_to_user(arg, &subs, sizeof(subs)))
2059 return -EFAULT;
2060 }
2061 return result;
2062 }
2063
2064
2065 /*
2066 * query next client
2067 */
2068 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2069 void __user *arg)
2070 {
2071 struct snd_seq_client *cptr = NULL;
2072 struct snd_seq_client_info info;
2073
2074 if (copy_from_user(&info, arg, sizeof(info)))
2075 return -EFAULT;
2076
2077 /* search for next client */
2078 info.client++;
2079 if (info.client < 0)
2080 info.client = 0;
2081 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2082 cptr = snd_seq_client_use_ptr(info.client);
2083 if (cptr)
2084 break; /* found */
2085 }
2086 if (cptr == NULL)
2087 return -ENOENT;
2088
2089 get_client_info(cptr, &info);
2090 snd_seq_client_unlock(cptr);
2091
2092 if (copy_to_user(arg, &info, sizeof(info)))
2093 return -EFAULT;
2094 return 0;
2095 }
2096
2097 /*
2098 * query next port
2099 */
2100 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2101 void __user *arg)
2102 {
2103 struct snd_seq_client *cptr;
2104 struct snd_seq_client_port *port = NULL;
2105 struct snd_seq_port_info info;
2106
2107 if (copy_from_user(&info, arg, sizeof(info)))
2108 return -EFAULT;
2109 cptr = snd_seq_client_use_ptr(info.addr.client);
2110 if (cptr == NULL)
2111 return -ENXIO;
2112
2113 /* search for next port */
2114 info.addr.port++;
2115 port = snd_seq_port_query_nearest(cptr, &info);
2116 if (port == NULL) {
2117 snd_seq_client_unlock(cptr);
2118 return -ENOENT;
2119 }
2120
2121 /* get port info */
2122 info.addr = port->addr;
2123 snd_seq_get_port_info(port, &info);
2124 snd_seq_port_unlock(port);
2125 snd_seq_client_unlock(cptr);
2126
2127 if (copy_to_user(arg, &info, sizeof(info)))
2128 return -EFAULT;
2129 return 0;
2130 }
2131
2132 /* -------------------------------------------------------- */
2133
2134 static struct seq_ioctl_table {
2135 unsigned int cmd;
2136 int (*func)(struct snd_seq_client *client, void __user * arg);
2137 } ioctl_tables[] = {
2138 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2139 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2140 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2141 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2142 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2143 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2144 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2145 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2146 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2147 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2148 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2149 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2150 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2151 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2152 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2153 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2154 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2155 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2156 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2157 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2158 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2159 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2160 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2161 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2162 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2163 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2164 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2165 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2166 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2167 { 0, NULL },
2168 };
2169
2170 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2171 void __user *arg)
2172 {
2173 struct seq_ioctl_table *p;
2174
2175 switch (cmd) {
2176 case SNDRV_SEQ_IOCTL_PVERSION:
2177 /* return sequencer version number */
2178 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2179 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2180 /* return the id of this client */
2181 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2182 }
2183
2184 if (! arg)
2185 return -EFAULT;
2186 for (p = ioctl_tables; p->cmd; p++) {
2187 if (p->cmd == cmd)
2188 return p->func(client, arg);
2189 }
2190 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2191 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2192 return -ENOTTY;
2193 }
2194
2195
2196 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2197 {
2198 struct snd_seq_client *client = file->private_data;
2199
2200 snd_assert(client != NULL, return -ENXIO);
2201
2202 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2203 }
2204
2205 #ifdef CONFIG_COMPAT
2206 #include "seq_compat.c"
2207 #else
2208 #define snd_seq_ioctl_compat NULL
2209 #endif
2210
2211 /* -------------------------------------------------------- */
2212
2213
2214 /* exported to kernel modules */
2215 int snd_seq_create_kernel_client(struct snd_card *card, int client_index)
2216 {
2217 struct snd_seq_client *client;
2218
2219 snd_assert(! in_interrupt(), return -EBUSY);
2220
2221 if (card && client_index > 3)
2222 return -EINVAL;
2223 if (card == NULL && client_index > 63)
2224 return -EINVAL;
2225
2226 if (down_interruptible(&register_mutex))
2227 return -ERESTARTSYS;
2228
2229 if (card) {
2230 if (card->number < 16)
2231 client_index += 64 + (card->number << 2);
2232 else
2233 client_index = -1;
2234 }
2235
2236 /* empty write queue as default */
2237 client = seq_create_client1(client_index, 0, 1);
2238 if (client == NULL) {
2239 up(&register_mutex);
2240 return -EBUSY; /* failure code */
2241 }
2242 usage_alloc(&client_usage, 1);
2243
2244 client->accept_input = 1;
2245 client->accept_output = 1;
2246
2247 sprintf(client->name, "Client-%d", client->number);
2248
2249 client->type = KERNEL_CLIENT;
2250 up(&register_mutex);
2251
2252 /* make others aware this new client */
2253 snd_seq_system_client_ev_client_start(client->number);
2254
2255 /* return client number to caller */
2256 return client->number;
2257 }
2258
2259 /* exported to kernel modules */
2260 int snd_seq_delete_kernel_client(int client)
2261 {
2262 struct snd_seq_client *ptr;
2263
2264 snd_assert(! in_interrupt(), return -EBUSY);
2265
2266 ptr = clientptr(client);
2267 if (ptr == NULL)
2268 return -EINVAL;
2269
2270 seq_free_client(ptr);
2271 kfree(ptr);
2272 return 0;
2273 }
2274
2275
2276 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2277 * and snd_seq_kernel_client_enqueue_blocking
2278 */
2279 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2280 struct file *file, int blocking,
2281 int atomic, int hop)
2282 {
2283 struct snd_seq_client *cptr;
2284 int result;
2285
2286 snd_assert(ev != NULL, return -EINVAL);
2287
2288 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2289 return 0; /* ignore this */
2290 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2291 return -EINVAL; /* quoted events can't be enqueued */
2292
2293 /* fill in client number */
2294 ev->source.client = client;
2295
2296 if (check_event_type_and_length(ev))
2297 return -EINVAL;
2298
2299 cptr = snd_seq_client_use_ptr(client);
2300 if (cptr == NULL)
2301 return -EINVAL;
2302
2303 if (! cptr->accept_output)
2304 result = -EPERM;
2305 else /* send it */
2306 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2307
2308 snd_seq_client_unlock(cptr);
2309 return result;
2310 }
2311
2312 /*
2313 * exported, called by kernel clients to enqueue events (w/o blocking)
2314 *
2315 * RETURN VALUE: zero if succeed, negative if error
2316 */
2317 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2318 int atomic, int hop)
2319 {
2320 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2321 }
2322
2323 /*
2324 * exported, called by kernel clients to enqueue events (with blocking)
2325 *
2326 * RETURN VALUE: zero if succeed, negative if error
2327 */
2328 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2329 struct file *file,
2330 int atomic, int hop)
2331 {
2332 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2333 }
2334
2335
2336 /*
2337 * exported, called by kernel clients to dispatch events directly to other
2338 * clients, bypassing the queues. Event time-stamp will be updated.
2339 *
2340 * RETURN VALUE: negative = delivery failed,
2341 * zero, or positive: the number of delivered events
2342 */
2343 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2344 int atomic, int hop)
2345 {
2346 struct snd_seq_client *cptr;
2347 int result;
2348
2349 snd_assert(ev != NULL, return -EINVAL);
2350
2351 /* fill in client number */
2352 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2353 ev->source.client = client;
2354
2355 if (check_event_type_and_length(ev))
2356 return -EINVAL;
2357
2358 cptr = snd_seq_client_use_ptr(client);
2359 if (cptr == NULL)
2360 return -EINVAL;
2361
2362 if (!cptr->accept_output)
2363 result = -EPERM;
2364 else
2365 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2366
2367 snd_seq_client_unlock(cptr);
2368 return result;
2369 }
2370
2371
2372 /*
2373 * exported, called by kernel clients to perform same functions as with
2374 * userland ioctl()
2375 */
2376 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2377 {
2378 struct snd_seq_client *client;
2379 mm_segment_t fs;
2380 int result;
2381
2382 client = clientptr(clientid);
2383 if (client == NULL)
2384 return -ENXIO;
2385 fs = snd_enter_user();
2386 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2387 snd_leave_user(fs);
2388 return result;
2389 }
2390
2391
2392 /* exported (for OSS emulator) */
2393 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2394 {
2395 struct snd_seq_client *client;
2396
2397 client = clientptr(clientid);
2398 if (client == NULL)
2399 return -ENXIO;
2400
2401 if (! snd_seq_write_pool_allocated(client))
2402 return 1;
2403 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2404 return 1;
2405 return 0;
2406 }
2407
2408 /*---------------------------------------------------------------------------*/
2409
2410 #ifdef CONFIG_PROC_FS
2411 /*
2412 * /proc interface
2413 */
2414 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2415 struct snd_seq_port_subs_info *group,
2416 int is_src, char *msg)
2417 {
2418 struct list_head *p;
2419 struct snd_seq_subscribers *s;
2420 int count = 0;
2421
2422 down_read(&group->list_mutex);
2423 if (list_empty(&group->list_head)) {
2424 up_read(&group->list_mutex);
2425 return;
2426 }
2427 snd_iprintf(buffer, msg);
2428 list_for_each(p, &group->list_head) {
2429 if (is_src)
2430 s = list_entry(p, struct snd_seq_subscribers, src_list);
2431 else
2432 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2433 if (count++)
2434 snd_iprintf(buffer, ", ");
2435 snd_iprintf(buffer, "%d:%d",
2436 is_src ? s->info.dest.client : s->info.sender.client,
2437 is_src ? s->info.dest.port : s->info.sender.port);
2438 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2439 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2440 if (group->exclusive)
2441 snd_iprintf(buffer, "[ex]");
2442 }
2443 up_read(&group->list_mutex);
2444 snd_iprintf(buffer, "\n");
2445 }
2446
2447 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2448 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2449 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2450
2451 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2452
2453 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2454 struct snd_seq_client *client)
2455 {
2456 struct list_head *l;
2457
2458 down(&client->ports_mutex);
2459 list_for_each(l, &client->ports_list_head) {
2460 struct snd_seq_client_port *p = list_entry(l, struct snd_seq_client_port, list);
2461 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2462 p->addr.port, p->name,
2463 FLAG_PERM_RD(p->capability),
2464 FLAG_PERM_WR(p->capability),
2465 FLAG_PERM_EX(p->capability),
2466 FLAG_PERM_DUPLEX(p->capability));
2467 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2468 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2469 }
2470 up(&client->ports_mutex);
2471 }
2472
2473
2474 void snd_seq_info_pool(struct snd_info_buffer *buffer,
2475 struct snd_seq_pool *pool, char *space);
2476
2477 /* exported to seq_info.c */
2478 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2479 struct snd_info_buffer *buffer)
2480 {
2481 int c;
2482 struct snd_seq_client *client;
2483
2484 snd_iprintf(buffer, "Client info\n");
2485 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2486 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2487 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2488 snd_iprintf(buffer, "\n");
2489
2490 /* list the client table */
2491 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2492 client = snd_seq_client_use_ptr(c);
2493 if (client == NULL)
2494 continue;
2495 if (client->type == NO_CLIENT) {
2496 snd_seq_client_unlock(client);
2497 continue;
2498 }
2499
2500 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2501 c, client->name,
2502 client->type == USER_CLIENT ? "User" : "Kernel");
2503 snd_seq_info_dump_ports(buffer, client);
2504 if (snd_seq_write_pool_allocated(client)) {
2505 snd_iprintf(buffer, " Output pool :\n");
2506 snd_seq_info_pool(buffer, client->pool, " ");
2507 }
2508 if (client->type == USER_CLIENT && client->data.user.fifo &&
2509 client->data.user.fifo->pool) {
2510 snd_iprintf(buffer, " Input pool :\n");
2511 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2512 }
2513 snd_seq_client_unlock(client);
2514 }
2515 }
2516 #endif /* CONFIG_PROC_FS */
2517
2518 /*---------------------------------------------------------------------------*/
2519
2520
2521 /*
2522 * REGISTRATION PART
2523 */
2524
2525 static struct file_operations snd_seq_f_ops =
2526 {
2527 .owner = THIS_MODULE,
2528 .read = snd_seq_read,
2529 .write = snd_seq_write,
2530 .open = snd_seq_open,
2531 .release = snd_seq_release,
2532 .poll = snd_seq_poll,
2533 .unlocked_ioctl = snd_seq_ioctl,
2534 .compat_ioctl = snd_seq_ioctl_compat,
2535 };
2536
2537 /*
2538 * register sequencer device
2539 */
2540 int __init snd_sequencer_device_init(void)
2541 {
2542 int err;
2543
2544 if (down_interruptible(&register_mutex))
2545 return -ERESTARTSYS;
2546
2547 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2548 &snd_seq_f_ops, NULL, "seq")) < 0) {
2549 up(&register_mutex);
2550 return err;
2551 }
2552
2553 up(&register_mutex);
2554
2555 return 0;
2556 }
2557
2558
2559
2560 /*
2561 * unregister sequencer device
2562 */
2563 void __exit snd_sequencer_device_done(void)
2564 {
2565 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2566 }
Stable & featurefull patchset based on Linus's git branch