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driver core: add way to get to bus kset
[linux-2.6/zen-sources.git] / sound / core / seq / seq_clientmgr.c
blob2e3fa25ab19ffe8208ba17a1d06023bbf8d0427a
1 /*
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>
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/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
30
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"
36 #include "seq_info.h"
37 #include "seq_system.h"
38 #include <sound/seq_device.h>
39 #ifdef CONFIG_COMPAT
40 #include <linux/compat.h>
41 #endif
42
43 /* Client Manager
44
45 * this module handles the connections of userland and kernel clients
46 *
47 */
48
49 /*
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
55 */
56
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
63
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)
67
68 static DEFINE_SPINLOCK(clients_lock);
69 static DEFINE_MUTEX(register_mutex);
70
71 /*
72 * client table
73 */
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;
77
78 /*
79 * prototypes
80 */
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);
87
88 /*
89 */
90
91 static inline mm_segment_t snd_enter_user(void)
92 {
93 mm_segment_t fs = get_fs();
94 set_fs(get_ds());
95 return fs;
96 }
97
98 static inline void snd_leave_user(mm_segment_t fs)
99 {
100 set_fs(fs);
101 }
102
103 /*
104 */
105 static inline unsigned short snd_seq_file_flags(struct file *file)
106 {
107 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
108 case FMODE_WRITE:
109 return SNDRV_SEQ_LFLG_OUTPUT;
110 case FMODE_READ:
111 return SNDRV_SEQ_LFLG_INPUT;
112 default:
113 return SNDRV_SEQ_LFLG_OPEN;
114 }
115 }
116
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
118 {
119 return snd_seq_total_cells(client->pool) > 0;
120 }
121
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
124 {
125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
127 clientid);
128 return NULL;
129 }
130 return clienttab[clientid];
131 }
132
133 extern int seq_client_load[];
134
135 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
136 {
137 unsigned long flags;
138 struct snd_seq_client *client;
139
140 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
141 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
142 clientid);
143 return NULL;
144 }
145 spin_lock_irqsave(&clients_lock, flags);
146 client = clientptr(clientid);
147 if (client)
148 goto __lock;
149 if (clienttablock[clientid]) {
150 spin_unlock_irqrestore(&clients_lock, flags);
151 return NULL;
152 }
153 spin_unlock_irqrestore(&clients_lock, flags);
154 #ifdef CONFIG_KMOD
155 if (!in_interrupt() && current->fs->root) {
156 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
157 static char card_requested[SNDRV_CARDS];
158 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
159 int idx;
160
161 if (! client_requested[clientid] && current->fs->root) {
162 client_requested[clientid] = 1;
163 for (idx = 0; idx < 15; idx++) {
164 if (seq_client_load[idx] < 0)
165 break;
166 if (seq_client_load[idx] == clientid) {
167 request_module("snd-seq-client-%i",
168 clientid);
169 break;
170 }
171 }
172 }
173 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
174 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
175 SNDRV_SEQ_CLIENTS_PER_CARD;
176 if (card < snd_ecards_limit) {
177 if (! card_requested[card]) {
178 card_requested[card] = 1;
179 snd_request_card(card);
180 }
181 snd_seq_device_load_drivers();
182 }
183 }
184 spin_lock_irqsave(&clients_lock, flags);
185 client = clientptr(clientid);
186 if (client)
187 goto __lock;
188 spin_unlock_irqrestore(&clients_lock, flags);
189 }
190 #endif
191 return NULL;
192
193 __lock:
194 snd_use_lock_use(&client->use_lock);
195 spin_unlock_irqrestore(&clients_lock, flags);
196 return client;
197 }
198
199 static void usage_alloc(struct snd_seq_usage *res, int num)
200 {
201 res->cur += num;
202 if (res->cur > res->peak)
203 res->peak = res->cur;
204 }
205
206 static void usage_free(struct snd_seq_usage *res, int num)
207 {
208 res->cur -= num;
209 }
210
211 /* initialise data structures */
212 int __init client_init_data(void)
213 {
214 /* zap out the client table */
215 memset(&clienttablock, 0, sizeof(clienttablock));
216 memset(&clienttab, 0, sizeof(clienttab));
217 return 0;
218 }
219
220
221 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
222 {
223 unsigned long flags;
224 int c;
225 struct snd_seq_client *client;
226
227 /* init client data */
228 client = kzalloc(sizeof(*client), GFP_KERNEL);
229 if (client == NULL)
230 return NULL;
231 client->pool = snd_seq_pool_new(poolsize);
232 if (client->pool == NULL) {
233 kfree(client);
234 return NULL;
235 }
236 client->type = NO_CLIENT;
237 snd_use_lock_init(&client->use_lock);
238 rwlock_init(&client->ports_lock);
239 mutex_init(&client->ports_mutex);
240 INIT_LIST_HEAD(&client->ports_list_head);
241
242 /* find free slot in the client table */
243 spin_lock_irqsave(&clients_lock, flags);
244 if (client_index < 0) {
245 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
246 c < SNDRV_SEQ_MAX_CLIENTS;
247 c++) {
248 if (clienttab[c] || clienttablock[c])
249 continue;
250 clienttab[client->number = c] = client;
251 spin_unlock_irqrestore(&clients_lock, flags);
252 return client;
253 }
254 } else {
255 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
256 clienttab[client->number = client_index] = client;
257 spin_unlock_irqrestore(&clients_lock, flags);
258 return client;
259 }
260 }
261 spin_unlock_irqrestore(&clients_lock, flags);
262 snd_seq_pool_delete(&client->pool);
263 kfree(client);
264 return NULL; /* no free slot found or busy, return failure code */
265 }
266
267
268 static int seq_free_client1(struct snd_seq_client *client)
269 {
270 unsigned long flags;
271
272 snd_assert(client != NULL, return -EINVAL);
273 snd_seq_delete_all_ports(client);
274 snd_seq_queue_client_leave(client->number);
275 spin_lock_irqsave(&clients_lock, flags);
276 clienttablock[client->number] = 1;
277 clienttab[client->number] = NULL;
278 spin_unlock_irqrestore(&clients_lock, flags);
279 snd_use_lock_sync(&client->use_lock);
280 snd_seq_queue_client_termination(client->number);
281 if (client->pool)
282 snd_seq_pool_delete(&client->pool);
283 spin_lock_irqsave(&clients_lock, flags);
284 clienttablock[client->number] = 0;
285 spin_unlock_irqrestore(&clients_lock, flags);
286 return 0;
287 }
288
289
290 static void seq_free_client(struct snd_seq_client * client)
291 {
292 mutex_lock(&register_mutex);
293 switch (client->type) {
294 case NO_CLIENT:
295 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
296 client->number);
297 break;
298 case USER_CLIENT:
299 case KERNEL_CLIENT:
300 seq_free_client1(client);
301 usage_free(&client_usage, 1);
302 break;
303
304 default:
305 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
306 client->number, client->type);
307 }
308 mutex_unlock(&register_mutex);
309
310 snd_seq_system_client_ev_client_exit(client->number);
311 }
312
313
314
315 /* -------------------------------------------------------- */
316
317 /* create a user client */
318 static int snd_seq_open(struct inode *inode, struct file *file)
319 {
320 int c, mode; /* client id */
321 struct snd_seq_client *client;
322 struct snd_seq_user_client *user;
323
324 if (mutex_lock_interruptible(&register_mutex))
325 return -ERESTARTSYS;
326 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
327 if (client == NULL) {
328 mutex_unlock(&register_mutex);
329 return -ENOMEM; /* failure code */
330 }
331
332 mode = snd_seq_file_flags(file);
333 if (mode & SNDRV_SEQ_LFLG_INPUT)
334 client->accept_input = 1;
335 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
336 client->accept_output = 1;
337
338 user = &client->data.user;
339 user->fifo = NULL;
340 user->fifo_pool_size = 0;
341
342 if (mode & SNDRV_SEQ_LFLG_INPUT) {
343 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
344 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
345 if (user->fifo == NULL) {
346 seq_free_client1(client);
347 kfree(client);
348 mutex_unlock(&register_mutex);
349 return -ENOMEM;
350 }
351 }
352
353 usage_alloc(&client_usage, 1);
354 client->type = USER_CLIENT;
355 mutex_unlock(&register_mutex);
356
357 c = client->number;
358 file->private_data = client;
359
360 /* fill client data */
361 user->file = file;
362 sprintf(client->name, "Client-%d", c);
363
364 /* make others aware this new client */
365 snd_seq_system_client_ev_client_start(c);
366
367 return 0;
368 }
369
370 /* delete a user client */
371 static int snd_seq_release(struct inode *inode, struct file *file)
372 {
373 struct snd_seq_client *client = file->private_data;
374
375 if (client) {
376 seq_free_client(client);
377 if (client->data.user.fifo)
378 snd_seq_fifo_delete(&client->data.user.fifo);
379 kfree(client);
380 }
381
382 return 0;
383 }
384
385
386 /* handle client read() */
387 /* possible error values:
388 * -ENXIO invalid client or file open mode
389 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
390 * -EINVAL no enough user-space buffer to write the whole event
391 * -EFAULT seg. fault during copy to user space
392 */
393 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
394 loff_t *offset)
395 {
396 struct snd_seq_client *client = file->private_data;
397 struct snd_seq_fifo *fifo;
398 int err;
399 long result = 0;
400 struct snd_seq_event_cell *cell;
401
402 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
403 return -ENXIO;
404
405 if (!access_ok(VERIFY_WRITE, buf, count))
406 return -EFAULT;
407
408 /* check client structures are in place */
409 snd_assert(client != NULL, return -ENXIO);
410
411 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
412 return -ENXIO;
413
414 if (atomic_read(&fifo->overflow) > 0) {
415 /* buffer overflow is detected */
416 snd_seq_fifo_clear(fifo);
417 /* return error code */
418 return -ENOSPC;
419 }
420
421 cell = NULL;
422 err = 0;
423 snd_seq_fifo_lock(fifo);
424
425 /* while data available in queue */
426 while (count >= sizeof(struct snd_seq_event)) {
427 int nonblock;
428
429 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
430 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
431 break;
432 }
433 if (snd_seq_ev_is_variable(&cell->event)) {
434 struct snd_seq_event tmpev;
435 tmpev = cell->event;
436 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
437 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
438 err = -EFAULT;
439 break;
440 }
441 count -= sizeof(struct snd_seq_event);
442 buf += sizeof(struct snd_seq_event);
443 err = snd_seq_expand_var_event(&cell->event, count,
444 (char __force *)buf, 0,
445 sizeof(struct snd_seq_event));
446 if (err < 0)
447 break;
448 result += err;
449 count -= err;
450 buf += err;
451 } else {
452 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
453 err = -EFAULT;
454 break;
455 }
456 count -= sizeof(struct snd_seq_event);
457 buf += sizeof(struct snd_seq_event);
458 }
459 snd_seq_cell_free(cell);
460 cell = NULL; /* to be sure */
461 result += sizeof(struct snd_seq_event);
462 }
463
464 if (err < 0) {
465 if (cell)
466 snd_seq_fifo_cell_putback(fifo, cell);
467 if (err == -EAGAIN && result > 0)
468 err = 0;
469 }
470 snd_seq_fifo_unlock(fifo);
471
472 return (err < 0) ? err : result;
473 }
474
475
476 /*
477 * check access permission to the port
478 */
479 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
480 {
481 if ((port->capability & flags) != flags)
482 return 0;
483 return flags;
484 }
485
486 /*
487 * check if the destination client is available, and return the pointer
488 * if filter is non-zero, client filter bitmap is tested.
489 */
490 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
491 int filter)
492 {
493 struct snd_seq_client *dest;
494
495 dest = snd_seq_client_use_ptr(event->dest.client);
496 if (dest == NULL)
497 return NULL;
498 if (! dest->accept_input)
499 goto __not_avail;
500 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
501 ! test_bit(event->type, dest->event_filter))
502 goto __not_avail;
503 if (filter && !(dest->filter & filter))
504 goto __not_avail;
505
506 return dest; /* ok - accessible */
507 __not_avail:
508 snd_seq_client_unlock(dest);
509 return NULL;
510 }
511
512
513 /*
514 * Return the error event.
515 *
516 * If the receiver client is a user client, the original event is
517 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
518 * the original event is also variable length, the external data is
519 * copied after the event record.
520 * If the receiver client is a kernel client, the original event is
521 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
522 * kmalloc.
523 */
524 static int bounce_error_event(struct snd_seq_client *client,
525 struct snd_seq_event *event,
526 int err, int atomic, int hop)
527 {
528 struct snd_seq_event bounce_ev;
529 int result;
530
531 if (client == NULL ||
532 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
533 ! client->accept_input)
534 return 0; /* ignored */
535
536 /* set up quoted error */
537 memset(&bounce_ev, 0, sizeof(bounce_ev));
538 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
539 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
540 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
541 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
542 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
543 bounce_ev.dest.client = client->number;
544 bounce_ev.dest.port = event->source.port;
545 bounce_ev.data.quote.origin = event->dest;
546 bounce_ev.data.quote.event = event;
547 bounce_ev.data.quote.value = -err; /* use positive value */
548 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
549 if (result < 0) {
550 client->event_lost++;
551 return result;
552 }
553
554 return result;
555 }
556
557
558 /*
559 * rewrite the time-stamp of the event record with the curren time
560 * of the given queue.
561 * return non-zero if updated.
562 */
563 static int update_timestamp_of_queue(struct snd_seq_event *event,
564 int queue, int real_time)
565 {
566 struct snd_seq_queue *q;
567
568 q = queueptr(queue);
569 if (! q)
570 return 0;
571 event->queue = queue;
572 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
573 if (real_time) {
574 event->time.time = snd_seq_timer_get_cur_time(q->timer);
575 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
576 } else {
577 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
578 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
579 }
580 queuefree(q);
581 return 1;
582 }
583
584
585 /*
586 * deliver an event to the specified destination.
587 * if filter is non-zero, client filter bitmap is tested.
588 *
589 * RETURN VALUE: 0 : if succeeded
590 * <0 : error
591 */
592 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
593 struct snd_seq_event *event,
594 int filter, int atomic, int hop)
595 {
596 struct snd_seq_client *dest = NULL;
597 struct snd_seq_client_port *dest_port = NULL;
598 int result = -ENOENT;
599 int direct;
600
601 direct = snd_seq_ev_is_direct(event);
602
603 dest = get_event_dest_client(event, filter);
604 if (dest == NULL)
605 goto __skip;
606 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
607 if (dest_port == NULL)
608 goto __skip;
609
610 /* check permission */
611 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
612 result = -EPERM;
613 goto __skip;
614 }
615
616 if (dest_port->timestamping)
617 update_timestamp_of_queue(event, dest_port->time_queue,
618 dest_port->time_real);
619
620 switch (dest->type) {
621 case USER_CLIENT:
622 if (dest->data.user.fifo)
623 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
624 break;
625
626 case KERNEL_CLIENT:
627 if (dest_port->event_input == NULL)
628 break;
629 result = dest_port->event_input(event, direct,
630 dest_port->private_data,
631 atomic, hop);
632 break;
633 default:
634 break;
635 }
636
637 __skip:
638 if (dest_port)
639 snd_seq_port_unlock(dest_port);
640 if (dest)
641 snd_seq_client_unlock(dest);
642
643 if (result < 0 && !direct) {
644 result = bounce_error_event(client, event, result, atomic, hop);
645 }
646 return result;
647 }
648
649
650 /*
651 * send the event to all subscribers:
652 */
653 static int deliver_to_subscribers(struct snd_seq_client *client,
654 struct snd_seq_event *event,
655 int atomic, int hop)
656 {
657 struct snd_seq_subscribers *subs;
658 int err = 0, num_ev = 0;
659 struct snd_seq_event event_saved;
660 struct snd_seq_client_port *src_port;
661 struct snd_seq_port_subs_info *grp;
662
663 src_port = snd_seq_port_use_ptr(client, event->source.port);
664 if (src_port == NULL)
665 return -EINVAL; /* invalid source port */
666 /* save original event record */
667 event_saved = *event;
668 grp = &src_port->c_src;
669
670 /* lock list */
671 if (atomic)
672 read_lock(&grp->list_lock);
673 else
674 down_read(&grp->list_mutex);
675 list_for_each_entry(subs, &grp->list_head, src_list) {
676 event->dest = subs->info.dest;
677 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
678 /* convert time according to flag with subscription */
679 update_timestamp_of_queue(event, subs->info.queue,
680 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
681 err = snd_seq_deliver_single_event(client, event,
682 0, atomic, hop);
683 if (err < 0)
684 break;
685 num_ev++;
686 /* restore original event record */
687 *event = event_saved;
688 }
689 if (atomic)
690 read_unlock(&grp->list_lock);
691 else
692 up_read(&grp->list_mutex);
693 *event = event_saved; /* restore */
694 snd_seq_port_unlock(src_port);
695 return (err < 0) ? err : num_ev;
696 }
697
698
699 #ifdef SUPPORT_BROADCAST
700 /*
701 * broadcast to all ports:
702 */
703 static int port_broadcast_event(struct snd_seq_client *client,
704 struct snd_seq_event *event,
705 int atomic, int hop)
706 {
707 int num_ev = 0, err = 0;
708 struct snd_seq_client *dest_client;
709 struct snd_seq_client_port *port;
710
711 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
712 if (dest_client == NULL)
713 return 0; /* no matching destination */
714
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,
721 atomic, hop);
722 if (err < 0)
723 break;
724 num_ev++;
725 }
726 read_unlock(&dest_client->ports_lock);
727 snd_seq_client_unlock(dest_client);
728 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
729 return (err < 0) ? err : num_ev;
730 }
731
732 /*
733 * send the event to all clients:
734 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
735 */
736 static int broadcast_event(struct snd_seq_client *client,
737 struct snd_seq_event *event, int atomic, int hop)
738 {
739 int err = 0, num_ev = 0;
740 int dest;
741 struct snd_seq_addr addr;
742
743 addr = event->dest; /* save */
744
745 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
746 /* don't send to itself */
747 if (dest == client->number)
748 continue;
749 event->dest.client = dest;
750 event->dest.port = addr.port;
751 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
752 err = port_broadcast_event(client, event, atomic, hop);
753 else
754 /* pass NULL as source client to avoid error bounce */
755 err = snd_seq_deliver_single_event(NULL, event,
756 SNDRV_SEQ_FILTER_BROADCAST,
757 atomic, hop);
758 if (err < 0)
759 break;
760 num_ev += err;
761 }
762 event->dest = addr; /* restore */
763 return (err < 0) ? err : num_ev;
764 }
765
766
767 /* multicast - not supported yet */
768 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
769 int atomic, int hop)
770 {
771 snd_printd("seq: multicast not supported yet.\n");
772 return 0; /* ignored */
773 }
774 #endif /* SUPPORT_BROADCAST */
775
776
777 /* deliver an event to the destination port(s).
778 * if the event is to subscribers or broadcast, the event is dispatched
779 * to multiple targets.
780 *
781 * RETURN VALUE: n > 0 : the number of delivered events.
782 * n == 0 : the event was not passed to any client.
783 * n < 0 : error - event was not processed.
784 */
785 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
786 int atomic, int hop)
787 {
788 int result;
789
790 hop++;
791 if (hop >= SNDRV_SEQ_MAX_HOPS) {
792 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
793 event->source.client, event->source.port,
794 event->dest.client, event->dest.port);
795 return -EMLINK;
796 }
797
798 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
799 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
800 result = deliver_to_subscribers(client, event, atomic, hop);
801 #ifdef SUPPORT_BROADCAST
802 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
803 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
804 result = broadcast_event(client, event, atomic, hop);
805 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
806 result = multicast_event(client, event, atomic, hop);
807 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
808 result = port_broadcast_event(client, event, atomic, hop);
809 #endif
810 else
811 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
812
813 return result;
814 }
815
816 /*
817 * dispatch an event cell:
818 * This function is called only from queue check routines in timer
819 * interrupts or after enqueued.
820 * The event cell shall be released or re-queued in this function.
821 *
822 * RETURN VALUE: n > 0 : the number of delivered events.
823 * n == 0 : the event was not passed to any client.
824 * n < 0 : error - event was not processed.
825 */
826 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
827 {
828 struct snd_seq_client *client;
829 int result;
830
831 snd_assert(cell != NULL, return -EINVAL);
832
833 client = snd_seq_client_use_ptr(cell->event.source.client);
834 if (client == NULL) {
835 snd_seq_cell_free(cell); /* release this cell */
836 return -EINVAL;
837 }
838
839 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
840 /* NOTE event:
841 * the event cell is re-used as a NOTE-OFF event and
842 * enqueued again.
843 */
844 struct snd_seq_event tmpev, *ev;
845
846 /* reserve this event to enqueue note-off later */
847 tmpev = cell->event;
848 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
849 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
850
851 /*
852 * This was originally a note event. We now re-use the
853 * cell for the note-off event.
854 */
855
856 ev = &cell->event;
857 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
858 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
859
860 /* add the duration time */
861 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
862 case SNDRV_SEQ_TIME_STAMP_TICK:
863 ev->time.tick += ev->data.note.duration;
864 break;
865 case SNDRV_SEQ_TIME_STAMP_REAL:
866 /* unit for duration is ms */
867 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
868 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
869 ev->time.time.tv_nsec / 1000000000;
870 ev->time.time.tv_nsec %= 1000000000;
871 break;
872 }
873 ev->data.note.velocity = ev->data.note.off_velocity;
874
875 /* Now queue this cell as the note off event */
876 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
877 snd_seq_cell_free(cell); /* release this cell */
878
879 } else {
880 /* Normal events:
881 * event cell is freed after processing the event
882 */
883
884 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
885 snd_seq_cell_free(cell);
886 }
887
888 snd_seq_client_unlock(client);
889 return result;
890 }
891
892
893 /* Allocate a cell from client pool and enqueue it to queue:
894 * if pool is empty and blocking is TRUE, sleep until a new cell is
895 * available.
896 */
897 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
898 struct snd_seq_event *event,
899 struct file *file, int blocking,
900 int atomic, int hop)
901 {
902 struct snd_seq_event_cell *cell;
903 int err;
904
905 /* special queue values - force direct passing */
906 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
907 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
908 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
909 } else
910 #ifdef SUPPORT_BROADCAST
911 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
912 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
913 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
914 }
915 #endif
916 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
917 /* check presence of source port */
918 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
919 if (src_port == NULL)
920 return -EINVAL;
921 snd_seq_port_unlock(src_port);
922 }
923
924 /* direct event processing without enqueued */
925 if (snd_seq_ev_is_direct(event)) {
926 if (event->type == SNDRV_SEQ_EVENT_NOTE)
927 return -EINVAL; /* this event must be enqueued! */
928 return snd_seq_deliver_event(client, event, atomic, hop);
929 }
930
931 /* Not direct, normal queuing */
932 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
933 return -EINVAL; /* invalid queue */
934 if (! snd_seq_write_pool_allocated(client))
935 return -ENXIO; /* queue is not allocated */
936
937 /* allocate an event cell */
938 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
939 if (err < 0)
940 return err;
941
942 /* we got a cell. enqueue it. */
943 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
944 snd_seq_cell_free(cell);
945 return err;
946 }
947
948 return 0;
949 }
950
951
952 /*
953 * check validity of event type and data length.
954 * return non-zero if invalid.
955 */
956 static int check_event_type_and_length(struct snd_seq_event *ev)
957 {
958 switch (snd_seq_ev_length_type(ev)) {
959 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
960 if (snd_seq_ev_is_variable_type(ev))
961 return -EINVAL;
962 break;
963 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
964 if (! snd_seq_ev_is_variable_type(ev) ||
965 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
966 return -EINVAL;
967 break;
968 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
969 if (! snd_seq_ev_is_instr_type(ev) ||
970 ! snd_seq_ev_is_direct(ev))
971 return -EINVAL;
972 break;
973 }
974 return 0;
975 }
976
977
978 /* handle write() */
979 /* possible error values:
980 * -ENXIO invalid client or file open mode
981 * -ENOMEM malloc failed
982 * -EFAULT seg. fault during copy from user space
983 * -EINVAL invalid event
984 * -EAGAIN no space in output pool
985 * -EINTR interrupts while sleep
986 * -EMLINK too many hops
987 * others depends on return value from driver callback
988 */
989 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
990 size_t count, loff_t *offset)
991 {
992 struct snd_seq_client *client = file->private_data;
993 int written = 0, len;
994 int err = -EINVAL;
995 struct snd_seq_event event;
996
997 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
998 return -ENXIO;
999
1000 /* check client structures are in place */
1001 snd_assert(client != NULL, return -ENXIO);
1002
1003 if (!client->accept_output || client->pool == NULL)
1004 return -ENXIO;
1005
1006 /* allocate the pool now if the pool is not allocated yet */
1007 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1008 if (snd_seq_pool_init(client->pool) < 0)
1009 return -ENOMEM;
1010 }
1011
1012 /* only process whole events */
1013 while (count >= sizeof(struct snd_seq_event)) {
1014 /* Read in the event header from the user */
1015 len = sizeof(event);
1016 if (copy_from_user(&event, buf, len)) {
1017 err = -EFAULT;
1018 break;
1019 }
1020 event.source.client = client->number; /* fill in client number */
1021 /* Check for extension data length */
1022 if (check_event_type_and_length(&event)) {
1023 err = -EINVAL;
1024 break;
1025 }
1026
1027 /* check for special events */
1028 if (event.type == SNDRV_SEQ_EVENT_NONE)
1029 goto __skip_event;
1030 else if (snd_seq_ev_is_reserved(&event)) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 if (snd_seq_ev_is_variable(&event)) {
1036 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1037 if ((size_t)(extlen + len) > count) {
1038 /* back out, will get an error this time or next */
1039 err = -EINVAL;
1040 break;
1041 }
1042 /* set user space pointer */
1043 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1044 event.data.ext.ptr = (char __force *)buf
1045 + sizeof(struct snd_seq_event);
1046 len += extlen; /* increment data length */
1047 } else {
1048 #ifdef CONFIG_COMPAT
1049 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1050 void *ptr = compat_ptr(event.data.raw32.d[1]);
1051 event.data.ext.ptr = ptr;
1052 }
1053 #endif
1054 }
1055
1056 /* ok, enqueue it */
1057 err = snd_seq_client_enqueue_event(client, &event, file,
1058 !(file->f_flags & O_NONBLOCK),
1059 0, 0);
1060 if (err < 0)
1061 break;
1062
1063 __skip_event:
1064 /* Update pointers and counts */
1065 count -= len;
1066 buf += len;
1067 written += len;
1068 }
1069
1070 return written ? written : err;
1071 }
1072
1073
1074 /*
1075 * handle polling
1076 */
1077 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1078 {
1079 struct snd_seq_client *client = file->private_data;
1080 unsigned int mask = 0;
1081
1082 /* check client structures are in place */
1083 snd_assert(client != NULL, return -ENXIO);
1084
1085 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1086 client->data.user.fifo) {
1087
1088 /* check if data is available in the outqueue */
1089 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1090 mask |= POLLIN | POLLRDNORM;
1091 }
1092
1093 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1094
1095 /* check if data is available in the pool */
1096 if (!snd_seq_write_pool_allocated(client) ||
1097 snd_seq_pool_poll_wait(client->pool, file, wait))
1098 mask |= POLLOUT | POLLWRNORM;
1099 }
1100
1101 return mask;
1102 }
1103
1104
1105 /*-----------------------------------------------------*/
1106
1107
1108 /* SYSTEM_INFO ioctl() */
1109 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1110 {
1111 struct snd_seq_system_info info;
1112
1113 memset(&info, 0, sizeof(info));
1114 /* fill the info fields */
1115 info.queues = SNDRV_SEQ_MAX_QUEUES;
1116 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1117 info.ports = 256; /* fixed limit */
1118 info.channels = 256; /* fixed limit */
1119 info.cur_clients = client_usage.cur;
1120 info.cur_queues = snd_seq_queue_get_cur_queues();
1121
1122 if (copy_to_user(arg, &info, sizeof(info)))
1123 return -EFAULT;
1124 return 0;
1125 }
1126
1127
1128 /* RUNNING_MODE ioctl() */
1129 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1130 {
1131 struct snd_seq_running_info info;
1132 struct snd_seq_client *cptr;
1133 int err = 0;
1134
1135 if (copy_from_user(&info, arg, sizeof(info)))
1136 return -EFAULT;
1137
1138 /* requested client number */
1139 cptr = snd_seq_client_use_ptr(info.client);
1140 if (cptr == NULL)
1141 return -ENOENT; /* don't change !!! */
1142
1143 #ifdef SNDRV_BIG_ENDIAN
1144 if (! info.big_endian) {
1145 err = -EINVAL;
1146 goto __err;
1147 }
1148 #else
1149 if (info.big_endian) {
1150 err = -EINVAL;
1151 goto __err;
1152 }
1153
1154 #endif
1155 if (info.cpu_mode > sizeof(long)) {
1156 err = -EINVAL;
1157 goto __err;
1158 }
1159 cptr->convert32 = (info.cpu_mode < sizeof(long));
1160 __err:
1161 snd_seq_client_unlock(cptr);
1162 return err;
1163 }
1164
1165 /* CLIENT_INFO ioctl() */
1166 static void get_client_info(struct snd_seq_client *cptr,
1167 struct snd_seq_client_info *info)
1168 {
1169 info->client = cptr->number;
1170
1171 /* fill the info fields */
1172 info->type = cptr->type;
1173 strcpy(info->name, cptr->name);
1174 info->filter = cptr->filter;
1175 info->event_lost = cptr->event_lost;
1176 memcpy(info->event_filter, cptr->event_filter, 32);
1177 info->num_ports = cptr->num_ports;
1178 memset(info->reserved, 0, sizeof(info->reserved));
1179 }
1180
1181 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1182 void __user *arg)
1183 {
1184 struct snd_seq_client *cptr;
1185 struct snd_seq_client_info client_info;
1186
1187 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1188 return -EFAULT;
1189
1190 /* requested client number */
1191 cptr = snd_seq_client_use_ptr(client_info.client);
1192 if (cptr == NULL)
1193 return -ENOENT; /* don't change !!! */
1194
1195 get_client_info(cptr, &client_info);
1196 snd_seq_client_unlock(cptr);
1197
1198 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1199 return -EFAULT;
1200 return 0;
1201 }
1202
1203
1204 /* CLIENT_INFO ioctl() */
1205 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1206 void __user *arg)
1207 {
1208 struct snd_seq_client_info client_info;
1209
1210 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1211 return -EFAULT;
1212
1213 /* it is not allowed to set the info fields for an another client */
1214 if (client->number != client_info.client)
1215 return -EPERM;
1216 /* also client type must be set now */
1217 if (client->type != client_info.type)
1218 return -EINVAL;
1219
1220 /* fill the info fields */
1221 if (client_info.name[0])
1222 strlcpy(client->name, client_info.name, sizeof(client->name));
1223
1224 client->filter = client_info.filter;
1225 client->event_lost = client_info.event_lost;
1226 memcpy(client->event_filter, client_info.event_filter, 32);
1227
1228 return 0;
1229 }
1230
1231
1232 /*
1233 * CREATE PORT ioctl()
1234 */
1235 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1236 void __user *arg)
1237 {
1238 struct snd_seq_client_port *port;
1239 struct snd_seq_port_info info;
1240 struct snd_seq_port_callback *callback;
1241
1242 if (copy_from_user(&info, arg, sizeof(info)))
1243 return -EFAULT;
1244
1245 /* it is not allowed to create the port for an another client */
1246 if (info.addr.client != client->number)
1247 return -EPERM;
1248
1249 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1250 if (port == NULL)
1251 return -ENOMEM;
1252
1253 if (client->type == USER_CLIENT && info.kernel) {
1254 snd_seq_delete_port(client, port->addr.port);
1255 return -EINVAL;
1256 }
1257 if (client->type == KERNEL_CLIENT) {
1258 if ((callback = info.kernel) != NULL) {
1259 if (callback->owner)
1260 port->owner = callback->owner;
1261 port->private_data = callback->private_data;
1262 port->private_free = callback->private_free;
1263 port->callback_all = callback->callback_all;
1264 port->event_input = callback->event_input;
1265 port->c_src.open = callback->subscribe;
1266 port->c_src.close = callback->unsubscribe;
1267 port->c_dest.open = callback->use;
1268 port->c_dest.close = callback->unuse;
1269 }
1270 }
1271
1272 info.addr = port->addr;
1273
1274 snd_seq_set_port_info(port, &info);
1275 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1276
1277 if (copy_to_user(arg, &info, sizeof(info)))
1278 return -EFAULT;
1279
1280 return 0;
1281 }
1282
1283 /*
1284 * DELETE PORT ioctl()
1285 */
1286 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1287 void __user *arg)
1288 {
1289 struct snd_seq_port_info info;
1290 int err;
1291
1292 /* set passed parameters */
1293 if (copy_from_user(&info, arg, sizeof(info)))
1294 return -EFAULT;
1295
1296 /* it is not allowed to remove the port for an another client */
1297 if (info.addr.client != client->number)
1298 return -EPERM;
1299
1300 err = snd_seq_delete_port(client, info.addr.port);
1301 if (err >= 0)
1302 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1303 return err;
1304 }
1305
1306
1307 /*
1308 * GET_PORT_INFO ioctl() (on any client)
1309 */
1310 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1311 void __user *arg)
1312 {
1313 struct snd_seq_client *cptr;
1314 struct snd_seq_client_port *port;
1315 struct snd_seq_port_info info;
1316
1317 if (copy_from_user(&info, arg, sizeof(info)))
1318 return -EFAULT;
1319 cptr = snd_seq_client_use_ptr(info.addr.client);
1320 if (cptr == NULL)
1321 return -ENXIO;
1322
1323 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1324 if (port == NULL) {
1325 snd_seq_client_unlock(cptr);
1326 return -ENOENT; /* don't change */
1327 }
1328
1329 /* get port info */
1330 snd_seq_get_port_info(port, &info);
1331 snd_seq_port_unlock(port);
1332 snd_seq_client_unlock(cptr);
1333
1334 if (copy_to_user(arg, &info, sizeof(info)))
1335 return -EFAULT;
1336 return 0;
1337 }
1338
1339
1340 /*
1341 * SET_PORT_INFO ioctl() (only ports on this/own client)
1342 */
1343 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1344 void __user *arg)
1345 {
1346 struct snd_seq_client_port *port;
1347 struct snd_seq_port_info info;
1348
1349 if (copy_from_user(&info, arg, sizeof(info)))
1350 return -EFAULT;
1351
1352 if (info.addr.client != client->number) /* only set our own ports ! */
1353 return -EPERM;
1354 port = snd_seq_port_use_ptr(client, info.addr.port);
1355 if (port) {
1356 snd_seq_set_port_info(port, &info);
1357 snd_seq_port_unlock(port);
1358 }
1359 return 0;
1360 }
1361
1362
1363 /*
1364 * port subscription (connection)
1365 */
1366 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1367 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1368
1369 static int check_subscription_permission(struct snd_seq_client *client,
1370 struct snd_seq_client_port *sport,
1371 struct snd_seq_client_port *dport,
1372 struct snd_seq_port_subscribe *subs)
1373 {
1374 if (client->number != subs->sender.client &&
1375 client->number != subs->dest.client) {
1376 /* connection by third client - check export permission */
1377 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1378 return -EPERM;
1379 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1380 return -EPERM;
1381 }
1382
1383 /* check read permission */
1384 /* if sender or receiver is the subscribing client itself,
1385 * no permission check is necessary
1386 */
1387 if (client->number != subs->sender.client) {
1388 if (! check_port_perm(sport, PERM_RD))
1389 return -EPERM;
1390 }
1391 /* check write permission */
1392 if (client->number != subs->dest.client) {
1393 if (! check_port_perm(dport, PERM_WR))
1394 return -EPERM;
1395 }
1396 return 0;
1397 }
1398
1399 /*
1400 * send an subscription notify event to user client:
1401 * client must be user client.
1402 */
1403 int snd_seq_client_notify_subscription(int client, int port,
1404 struct snd_seq_port_subscribe *info,
1405 int evtype)
1406 {
1407 struct snd_seq_event event;
1408
1409 memset(&event, 0, sizeof(event));
1410 event.type = evtype;
1411 event.data.connect.dest = info->dest;
1412 event.data.connect.sender = info->sender;
1413
1414 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1415 }
1416
1417
1418 /*
1419 * add to port's subscription list IOCTL interface
1420 */
1421 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1422 void __user *arg)
1423 {
1424 int result = -EINVAL;
1425 struct snd_seq_client *receiver = NULL, *sender = NULL;
1426 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1427 struct snd_seq_port_subscribe subs;
1428
1429 if (copy_from_user(&subs, arg, sizeof(subs)))
1430 return -EFAULT;
1431
1432 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1433 goto __end;
1434 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1435 goto __end;
1436 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1437 goto __end;
1438 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1439 goto __end;
1440
1441 result = check_subscription_permission(client, sport, dport, &subs);
1442 if (result < 0)
1443 goto __end;
1444
1445 /* connect them */
1446 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1447 if (! result) /* broadcast announce */
1448 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1449 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1450 __end:
1451 if (sport)
1452 snd_seq_port_unlock(sport);
1453 if (dport)
1454 snd_seq_port_unlock(dport);
1455 if (sender)
1456 snd_seq_client_unlock(sender);
1457 if (receiver)
1458 snd_seq_client_unlock(receiver);
1459 return result;
1460 }
1461
1462
1463 /*
1464 * remove from port's subscription list
1465 */
1466 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1467 void __user *arg)
1468 {
1469 int result = -ENXIO;
1470 struct snd_seq_client *receiver = NULL, *sender = NULL;
1471 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1472 struct snd_seq_port_subscribe subs;
1473
1474 if (copy_from_user(&subs, arg, sizeof(subs)))
1475 return -EFAULT;
1476
1477 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1478 goto __end;
1479 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1480 goto __end;
1481 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1482 goto __end;
1483 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1484 goto __end;
1485
1486 result = check_subscription_permission(client, sport, dport, &subs);
1487 if (result < 0)
1488 goto __end;
1489
1490 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1491 if (! result) /* broadcast announce */
1492 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1493 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1494 __end:
1495 if (sport)
1496 snd_seq_port_unlock(sport);
1497 if (dport)
1498 snd_seq_port_unlock(dport);
1499 if (sender)
1500 snd_seq_client_unlock(sender);
1501 if (receiver)
1502 snd_seq_client_unlock(receiver);
1503 return result;
1504 }
1505
1506
1507 /* CREATE_QUEUE ioctl() */
1508 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1509 void __user *arg)
1510 {
1511 struct snd_seq_queue_info info;
1512 int result;
1513 struct snd_seq_queue *q;
1514
1515 if (copy_from_user(&info, arg, sizeof(info)))
1516 return -EFAULT;
1517
1518 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1519 if (result < 0)
1520 return result;
1521
1522 q = queueptr(result);
1523 if (q == NULL)
1524 return -EINVAL;
1525
1526 info.queue = q->queue;
1527 info.locked = q->locked;
1528 info.owner = q->owner;
1529
1530 /* set queue name */
1531 if (! info.name[0])
1532 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1533 strlcpy(q->name, info.name, sizeof(q->name));
1534 queuefree(q);
1535
1536 if (copy_to_user(arg, &info, sizeof(info)))
1537 return -EFAULT;
1538
1539 return 0;
1540 }
1541
1542 /* DELETE_QUEUE ioctl() */
1543 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1544 void __user *arg)
1545 {
1546 struct snd_seq_queue_info info;
1547
1548 if (copy_from_user(&info, arg, sizeof(info)))
1549 return -EFAULT;
1550
1551 return snd_seq_queue_delete(client->number, info.queue);
1552 }
1553
1554 /* GET_QUEUE_INFO ioctl() */
1555 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1556 void __user *arg)
1557 {
1558 struct snd_seq_queue_info info;
1559 struct snd_seq_queue *q;
1560
1561 if (copy_from_user(&info, arg, sizeof(info)))
1562 return -EFAULT;
1563
1564 q = queueptr(info.queue);
1565 if (q == NULL)
1566 return -EINVAL;
1567
1568 memset(&info, 0, sizeof(info));
1569 info.queue = q->queue;
1570 info.owner = q->owner;
1571 info.locked = q->locked;
1572 strlcpy(info.name, q->name, sizeof(info.name));
1573 queuefree(q);
1574
1575 if (copy_to_user(arg, &info, sizeof(info)))
1576 return -EFAULT;
1577
1578 return 0;
1579 }
1580
1581 /* SET_QUEUE_INFO ioctl() */
1582 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1583 void __user *arg)
1584 {
1585 struct snd_seq_queue_info info;
1586 struct snd_seq_queue *q;
1587
1588 if (copy_from_user(&info, arg, sizeof(info)))
1589 return -EFAULT;
1590
1591 if (info.owner != client->number)
1592 return -EINVAL;
1593
1594 /* change owner/locked permission */
1595 if (snd_seq_queue_check_access(info.queue, client->number)) {
1596 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1597 return -EPERM;
1598 if (info.locked)
1599 snd_seq_queue_use(info.queue, client->number, 1);
1600 } else {
1601 return -EPERM;
1602 }
1603
1604 q = queueptr(info.queue);
1605 if (! q)
1606 return -EINVAL;
1607 if (q->owner != client->number) {
1608 queuefree(q);
1609 return -EPERM;
1610 }
1611 strlcpy(q->name, info.name, sizeof(q->name));
1612 queuefree(q);
1613
1614 return 0;
1615 }
1616
1617 /* GET_NAMED_QUEUE ioctl() */
1618 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1619 {
1620 struct snd_seq_queue_info info;
1621 struct snd_seq_queue *q;
1622
1623 if (copy_from_user(&info, arg, sizeof(info)))
1624 return -EFAULT;
1625
1626 q = snd_seq_queue_find_name(info.name);
1627 if (q == NULL)
1628 return -EINVAL;
1629 info.queue = q->queue;
1630 info.owner = q->owner;
1631 info.locked = q->locked;
1632 queuefree(q);
1633
1634 if (copy_to_user(arg, &info, sizeof(info)))
1635 return -EFAULT;
1636
1637 return 0;
1638 }
1639
1640 /* GET_QUEUE_STATUS ioctl() */
1641 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1642 void __user *arg)
1643 {
1644 struct snd_seq_queue_status status;
1645 struct snd_seq_queue *queue;
1646 struct snd_seq_timer *tmr;
1647
1648 if (copy_from_user(&status, arg, sizeof(status)))
1649 return -EFAULT;
1650
1651 queue = queueptr(status.queue);
1652 if (queue == NULL)
1653 return -EINVAL;
1654 memset(&status, 0, sizeof(status));
1655 status.queue = queue->queue;
1656
1657 tmr = queue->timer;
1658 status.events = queue->tickq->cells + queue->timeq->cells;
1659
1660 status.time = snd_seq_timer_get_cur_time(tmr);
1661 status.tick = snd_seq_timer_get_cur_tick(tmr);
1662
1663 status.running = tmr->running;
1664
1665 status.flags = queue->flags;
1666 queuefree(queue);
1667
1668 if (copy_to_user(arg, &status, sizeof(status)))
1669 return -EFAULT;
1670 return 0;
1671 }
1672
1673
1674 /* GET_QUEUE_TEMPO ioctl() */
1675 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1676 void __user *arg)
1677 {
1678 struct snd_seq_queue_tempo tempo;
1679 struct snd_seq_queue *queue;
1680 struct snd_seq_timer *tmr;
1681
1682 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1683 return -EFAULT;
1684
1685 queue = queueptr(tempo.queue);
1686 if (queue == NULL)
1687 return -EINVAL;
1688 memset(&tempo, 0, sizeof(tempo));
1689 tempo.queue = queue->queue;
1690
1691 tmr = queue->timer;
1692
1693 tempo.tempo = tmr->tempo;
1694 tempo.ppq = tmr->ppq;
1695 tempo.skew_value = tmr->skew;
1696 tempo.skew_base = tmr->skew_base;
1697 queuefree(queue);
1698
1699 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1700 return -EFAULT;
1701 return 0;
1702 }
1703
1704
1705 /* SET_QUEUE_TEMPO ioctl() */
1706 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1707 {
1708 if (!snd_seq_queue_check_access(tempo->queue, client))
1709 return -EPERM;
1710 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1711 }
1712
1713 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1714
1715 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1716 void __user *arg)
1717 {
1718 int result;
1719 struct snd_seq_queue_tempo tempo;
1720
1721 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1722 return -EFAULT;
1723
1724 result = snd_seq_set_queue_tempo(client->number, &tempo);
1725 return result < 0 ? result : 0;
1726 }
1727
1728
1729 /* GET_QUEUE_TIMER ioctl() */
1730 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1731 void __user *arg)
1732 {
1733 struct snd_seq_queue_timer timer;
1734 struct snd_seq_queue *queue;
1735 struct snd_seq_timer *tmr;
1736
1737 if (copy_from_user(&timer, arg, sizeof(timer)))
1738 return -EFAULT;
1739
1740 queue = queueptr(timer.queue);
1741 if (queue == NULL)
1742 return -EINVAL;
1743
1744 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1745 queuefree(queue);
1746 return -ERESTARTSYS;
1747 }
1748 tmr = queue->timer;
1749 memset(&timer, 0, sizeof(timer));
1750 timer.queue = queue->queue;
1751
1752 timer.type = tmr->type;
1753 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1754 timer.u.alsa.id = tmr->alsa_id;
1755 timer.u.alsa.resolution = tmr->preferred_resolution;
1756 }
1757 mutex_unlock(&queue->timer_mutex);
1758 queuefree(queue);
1759
1760 if (copy_to_user(arg, &timer, sizeof(timer)))
1761 return -EFAULT;
1762 return 0;
1763 }
1764
1765
1766 /* SET_QUEUE_TIMER ioctl() */
1767 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1768 void __user *arg)
1769 {
1770 int result = 0;
1771 struct snd_seq_queue_timer timer;
1772
1773 if (copy_from_user(&timer, arg, sizeof(timer)))
1774 return -EFAULT;
1775
1776 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1777 return -EINVAL;
1778
1779 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1780 struct snd_seq_queue *q;
1781 struct snd_seq_timer *tmr;
1782
1783 q = queueptr(timer.queue);
1784 if (q == NULL)
1785 return -ENXIO;
1786 if (mutex_lock_interruptible(&q->timer_mutex)) {
1787 queuefree(q);
1788 return -ERESTARTSYS;
1789 }
1790 tmr = q->timer;
1791 snd_seq_queue_timer_close(timer.queue);
1792 tmr->type = timer.type;
1793 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1794 tmr->alsa_id = timer.u.alsa.id;
1795 tmr->preferred_resolution = timer.u.alsa.resolution;
1796 }
1797 result = snd_seq_queue_timer_open(timer.queue);
1798 mutex_unlock(&q->timer_mutex);
1799 queuefree(q);
1800 } else {
1801 return -EPERM;
1802 }
1803
1804 return result;
1805 }
1806
1807
1808 /* GET_QUEUE_CLIENT ioctl() */
1809 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1810 void __user *arg)
1811 {
1812 struct snd_seq_queue_client info;
1813 int used;
1814
1815 if (copy_from_user(&info, arg, sizeof(info)))
1816 return -EFAULT;
1817
1818 used = snd_seq_queue_is_used(info.queue, client->number);
1819 if (used < 0)
1820 return -EINVAL;
1821 info.used = used;
1822 info.client = client->number;
1823
1824 if (copy_to_user(arg, &info, sizeof(info)))
1825 return -EFAULT;
1826 return 0;
1827 }
1828
1829
1830 /* SET_QUEUE_CLIENT ioctl() */
1831 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1832 void __user *arg)
1833 {
1834 int err;
1835 struct snd_seq_queue_client info;
1836
1837 if (copy_from_user(&info, arg, sizeof(info)))
1838 return -EFAULT;
1839
1840 if (info.used >= 0) {
1841 err = snd_seq_queue_use(info.queue, client->number, info.used);
1842 if (err < 0)
1843 return err;
1844 }
1845
1846 return snd_seq_ioctl_get_queue_client(client, arg);
1847 }
1848
1849
1850 /* GET_CLIENT_POOL ioctl() */
1851 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1852 void __user *arg)
1853 {
1854 struct snd_seq_client_pool info;
1855 struct snd_seq_client *cptr;
1856
1857 if (copy_from_user(&info, arg, sizeof(info)))
1858 return -EFAULT;
1859
1860 cptr = snd_seq_client_use_ptr(info.client);
1861 if (cptr == NULL)
1862 return -ENOENT;
1863 memset(&info, 0, sizeof(info));
1864 info.output_pool = cptr->pool->size;
1865 info.output_room = cptr->pool->room;
1866 info.output_free = info.output_pool;
1867 info.output_free = snd_seq_unused_cells(cptr->pool);
1868 if (cptr->type == USER_CLIENT) {
1869 info.input_pool = cptr->data.user.fifo_pool_size;
1870 info.input_free = info.input_pool;
1871 if (cptr->data.user.fifo)
1872 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1873 } else {
1874 info.input_pool = 0;
1875 info.input_free = 0;
1876 }
1877 snd_seq_client_unlock(cptr);
1878
1879 if (copy_to_user(arg, &info, sizeof(info)))
1880 return -EFAULT;
1881 return 0;
1882 }
1883
1884 /* SET_CLIENT_POOL ioctl() */
1885 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1886 void __user *arg)
1887 {
1888 struct snd_seq_client_pool info;
1889 int rc;
1890
1891 if (copy_from_user(&info, arg, sizeof(info)))
1892 return -EFAULT;
1893
1894 if (client->number != info.client)
1895 return -EINVAL; /* can't change other clients */
1896
1897 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1898 (! snd_seq_write_pool_allocated(client) ||
1899 info.output_pool != client->pool->size)) {
1900 if (snd_seq_write_pool_allocated(client)) {
1901 /* remove all existing cells */
1902 snd_seq_queue_client_leave_cells(client->number);
1903 snd_seq_pool_done(client->pool);
1904 }
1905 client->pool->size = info.output_pool;
1906 rc = snd_seq_pool_init(client->pool);
1907 if (rc < 0)
1908 return rc;
1909 }
1910 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1911 info.input_pool >= 1 &&
1912 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1913 info.input_pool != client->data.user.fifo_pool_size) {
1914 /* change pool size */
1915 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1916 if (rc < 0)
1917 return rc;
1918 client->data.user.fifo_pool_size = info.input_pool;
1919 }
1920 if (info.output_room >= 1 &&
1921 info.output_room <= client->pool->size) {
1922 client->pool->room = info.output_room;
1923 }
1924
1925 return snd_seq_ioctl_get_client_pool(client, arg);
1926 }
1927
1928
1929 /* REMOVE_EVENTS ioctl() */
1930 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1931 void __user *arg)
1932 {
1933 struct snd_seq_remove_events info;
1934
1935 if (copy_from_user(&info, arg, sizeof(info)))
1936 return -EFAULT;
1937
1938 /*
1939 * Input mostly not implemented XXX.
1940 */
1941 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1942 /*
1943 * No restrictions so for a user client we can clear
1944 * the whole fifo
1945 */
1946 if (client->type == USER_CLIENT)
1947 snd_seq_fifo_clear(client->data.user.fifo);
1948 }
1949
1950 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1951 snd_seq_queue_remove_cells(client->number, &info);
1952
1953 return 0;
1954 }
1955
1956
1957 /*
1958 * get subscription info
1959 */
1960 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1961 void __user *arg)
1962 {
1963 int result;
1964 struct snd_seq_client *sender = NULL;
1965 struct snd_seq_client_port *sport = NULL;
1966 struct snd_seq_port_subscribe subs;
1967 struct snd_seq_subscribers *p;
1968
1969 if (copy_from_user(&subs, arg, sizeof(subs)))
1970 return -EFAULT;
1971
1972 result = -EINVAL;
1973 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1974 goto __end;
1975 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1976 goto __end;
1977 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1978 if (p) {
1979 result = 0;
1980 subs = p->info;
1981 } else
1982 result = -ENOENT;
1983
1984 __end:
1985 if (sport)
1986 snd_seq_port_unlock(sport);
1987 if (sender)
1988 snd_seq_client_unlock(sender);
1989 if (result >= 0) {
1990 if (copy_to_user(arg, &subs, sizeof(subs)))
1991 return -EFAULT;
1992 }
1993 return result;
1994 }
1995
1996
1997 /*
1998 * get subscription info - check only its presence
1999 */
2000 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2001 void __user *arg)
2002 {
2003 int result = -ENXIO;
2004 struct snd_seq_client *cptr = NULL;
2005 struct snd_seq_client_port *port = NULL;
2006 struct snd_seq_query_subs subs;
2007 struct snd_seq_port_subs_info *group;
2008 struct list_head *p;
2009 int i;
2010
2011 if (copy_from_user(&subs, arg, sizeof(subs)))
2012 return -EFAULT;
2013
2014 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2015 goto __end;
2016 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2017 goto __end;
2018
2019 switch (subs.type) {
2020 case SNDRV_SEQ_QUERY_SUBS_READ:
2021 group = &port->c_src;
2022 break;
2023 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2024 group = &port->c_dest;
2025 break;
2026 default:
2027 goto __end;
2028 }
2029
2030 down_read(&group->list_mutex);
2031 /* search for the subscriber */
2032 subs.num_subs = group->count;
2033 i = 0;
2034 result = -ENOENT;
2035 list_for_each(p, &group->list_head) {
2036 if (i++ == subs.index) {
2037 /* found! */
2038 struct snd_seq_subscribers *s;
2039 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2040 s = list_entry(p, struct snd_seq_subscribers, src_list);
2041 subs.addr = s->info.dest;
2042 } else {
2043 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2044 subs.addr = s->info.sender;
2045 }
2046 subs.flags = s->info.flags;
2047 subs.queue = s->info.queue;
2048 result = 0;
2049 break;
2050 }
2051 }
2052 up_read(&group->list_mutex);
2053
2054 __end:
2055 if (port)
2056 snd_seq_port_unlock(port);
2057 if (cptr)
2058 snd_seq_client_unlock(cptr);
2059 if (result >= 0) {
2060 if (copy_to_user(arg, &subs, sizeof(subs)))
2061 return -EFAULT;
2062 }
2063 return result;
2064 }
2065
2066
2067 /*
2068 * query next client
2069 */
2070 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2071 void __user *arg)
2072 {
2073 struct snd_seq_client *cptr = NULL;
2074 struct snd_seq_client_info info;
2075
2076 if (copy_from_user(&info, arg, sizeof(info)))
2077 return -EFAULT;
2078
2079 /* search for next client */
2080 info.client++;
2081 if (info.client < 0)
2082 info.client = 0;
2083 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2084 cptr = snd_seq_client_use_ptr(info.client);
2085 if (cptr)
2086 break; /* found */
2087 }
2088 if (cptr == NULL)
2089 return -ENOENT;
2090
2091 get_client_info(cptr, &info);
2092 snd_seq_client_unlock(cptr);
2093
2094 if (copy_to_user(arg, &info, sizeof(info)))
2095 return -EFAULT;
2096 return 0;
2097 }
2098
2099 /*
2100 * query next port
2101 */
2102 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2103 void __user *arg)
2104 {
2105 struct snd_seq_client *cptr;
2106 struct snd_seq_client_port *port = NULL;
2107 struct snd_seq_port_info info;
2108
2109 if (copy_from_user(&info, arg, sizeof(info)))
2110 return -EFAULT;
2111 cptr = snd_seq_client_use_ptr(info.addr.client);
2112 if (cptr == NULL)
2113 return -ENXIO;
2114
2115 /* search for next port */
2116 info.addr.port++;
2117 port = snd_seq_port_query_nearest(cptr, &info);
2118 if (port == NULL) {
2119 snd_seq_client_unlock(cptr);
2120 return -ENOENT;
2121 }
2122
2123 /* get port info */
2124 info.addr = port->addr;
2125 snd_seq_get_port_info(port, &info);
2126 snd_seq_port_unlock(port);
2127 snd_seq_client_unlock(cptr);
2128
2129 if (copy_to_user(arg, &info, sizeof(info)))
2130 return -EFAULT;
2131 return 0;
2132 }
2133
2134 /* -------------------------------------------------------- */
2135
2136 static struct seq_ioctl_table {
2137 unsigned int cmd;
2138 int (*func)(struct snd_seq_client *client, void __user * arg);
2139 } ioctl_tables[] = {
2140 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2141 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2142 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2143 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2144 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2145 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2146 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2147 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2148 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2149 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2150 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2151 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2152 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2153 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2154 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2155 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2156 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2157 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2158 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2159 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2160 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2161 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2162 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2163 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2164 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2165 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2166 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2167 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2168 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2169 { 0, NULL },
2170 };
2171
2172 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2173 void __user *arg)
2174 {
2175 struct seq_ioctl_table *p;
2176
2177 switch (cmd) {
2178 case SNDRV_SEQ_IOCTL_PVERSION:
2179 /* return sequencer version number */
2180 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2181 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2182 /* return the id of this client */
2183 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2184 }
2185
2186 if (! arg)
2187 return -EFAULT;
2188 for (p = ioctl_tables; p->cmd; p++) {
2189 if (p->cmd == cmd)
2190 return p->func(client, arg);
2191 }
2192 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2193 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2194 return -ENOTTY;
2195 }
2196
2197
2198 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2199 {
2200 struct snd_seq_client *client = file->private_data;
2201
2202 snd_assert(client != NULL, return -ENXIO);
2203
2204 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2205 }
2206
2207 #ifdef CONFIG_COMPAT
2208 #include "seq_compat.c"
2209 #else
2210 #define snd_seq_ioctl_compat NULL
2211 #endif
2212
2213 /* -------------------------------------------------------- */
2214
2215
2216 /* exported to kernel modules */
2217 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2218 const char *name_fmt, ...)
2219 {
2220 struct snd_seq_client *client;
2221 va_list args;
2222
2223 snd_assert(! in_interrupt(), return -EBUSY);
2224
2225 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2226 return -EINVAL;
2227 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2228 return -EINVAL;
2229
2230 if (mutex_lock_interruptible(&register_mutex))
2231 return -ERESTARTSYS;
2232
2233 if (card) {
2234 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2235 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2236 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2237 client_index = -1;
2238 }
2239
2240 /* empty write queue as default */
2241 client = seq_create_client1(client_index, 0);
2242 if (client == NULL) {
2243 mutex_unlock(&register_mutex);
2244 return -EBUSY; /* failure code */
2245 }
2246 usage_alloc(&client_usage, 1);
2247
2248 client->accept_input = 1;
2249 client->accept_output = 1;
2250
2251 va_start(args, name_fmt);
2252 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2253 va_end(args);
2254
2255 client->type = KERNEL_CLIENT;
2256 mutex_unlock(&register_mutex);
2257
2258 /* make others aware this new client */
2259 snd_seq_system_client_ev_client_start(client->number);
2260
2261 /* return client number to caller */
2262 return client->number;
2263 }
2264
2265 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2266
2267 /* exported to kernel modules */
2268 int snd_seq_delete_kernel_client(int client)
2269 {
2270 struct snd_seq_client *ptr;
2271
2272 snd_assert(! in_interrupt(), return -EBUSY);
2273
2274 ptr = clientptr(client);
2275 if (ptr == NULL)
2276 return -EINVAL;
2277
2278 seq_free_client(ptr);
2279 kfree(ptr);
2280 return 0;
2281 }
2282
2283 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2284
2285 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2286 * and snd_seq_kernel_client_enqueue_blocking
2287 */
2288 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2289 struct file *file, int blocking,
2290 int atomic, int hop)
2291 {
2292 struct snd_seq_client *cptr;
2293 int result;
2294
2295 snd_assert(ev != NULL, return -EINVAL);
2296
2297 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2298 return 0; /* ignore this */
2299 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2300 return -EINVAL; /* quoted events can't be enqueued */
2301
2302 /* fill in client number */
2303 ev->source.client = client;
2304
2305 if (check_event_type_and_length(ev))
2306 return -EINVAL;
2307
2308 cptr = snd_seq_client_use_ptr(client);
2309 if (cptr == NULL)
2310 return -EINVAL;
2311
2312 if (! cptr->accept_output)
2313 result = -EPERM;
2314 else /* send it */
2315 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2316
2317 snd_seq_client_unlock(cptr);
2318 return result;
2319 }
2320
2321 /*
2322 * exported, called by kernel clients to enqueue events (w/o blocking)
2323 *
2324 * RETURN VALUE: zero if succeed, negative if error
2325 */
2326 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2327 int atomic, int hop)
2328 {
2329 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2330 }
2331
2332 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2333
2334 /*
2335 * exported, called by kernel clients to enqueue events (with blocking)
2336 *
2337 * RETURN VALUE: zero if succeed, negative if error
2338 */
2339 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2340 struct file *file,
2341 int atomic, int hop)
2342 {
2343 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2344 }
2345
2346 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2347
2348 /*
2349 * exported, called by kernel clients to dispatch events directly to other
2350 * clients, bypassing the queues. Event time-stamp will be updated.
2351 *
2352 * RETURN VALUE: negative = delivery failed,
2353 * zero, or positive: the number of delivered events
2354 */
2355 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2356 int atomic, int hop)
2357 {
2358 struct snd_seq_client *cptr;
2359 int result;
2360
2361 snd_assert(ev != NULL, return -EINVAL);
2362
2363 /* fill in client number */
2364 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2365 ev->source.client = client;
2366
2367 if (check_event_type_and_length(ev))
2368 return -EINVAL;
2369
2370 cptr = snd_seq_client_use_ptr(client);
2371 if (cptr == NULL)
2372 return -EINVAL;
2373
2374 if (!cptr->accept_output)
2375 result = -EPERM;
2376 else
2377 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2378
2379 snd_seq_client_unlock(cptr);
2380 return result;
2381 }
2382
2383 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2384
2385 /*
2386 * exported, called by kernel clients to perform same functions as with
2387 * userland ioctl()
2388 */
2389 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2390 {
2391 struct snd_seq_client *client;
2392 mm_segment_t fs;
2393 int result;
2394
2395 client = clientptr(clientid);
2396 if (client == NULL)
2397 return -ENXIO;
2398 fs = snd_enter_user();
2399 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2400 snd_leave_user(fs);
2401 return result;
2402 }
2403
2404 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2405
2406 /* exported (for OSS emulator) */
2407 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2408 {
2409 struct snd_seq_client *client;
2410
2411 client = clientptr(clientid);
2412 if (client == NULL)
2413 return -ENXIO;
2414
2415 if (! snd_seq_write_pool_allocated(client))
2416 return 1;
2417 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2418 return 1;
2419 return 0;
2420 }
2421
2422 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2423
2424 /*---------------------------------------------------------------------------*/
2425
2426 #ifdef CONFIG_PROC_FS
2427 /*
2428 * /proc interface
2429 */
2430 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2431 struct snd_seq_port_subs_info *group,
2432 int is_src, char *msg)
2433 {
2434 struct list_head *p;
2435 struct snd_seq_subscribers *s;
2436 int count = 0;
2437
2438 down_read(&group->list_mutex);
2439 if (list_empty(&group->list_head)) {
2440 up_read(&group->list_mutex);
2441 return;
2442 }
2443 snd_iprintf(buffer, msg);
2444 list_for_each(p, &group->list_head) {
2445 if (is_src)
2446 s = list_entry(p, struct snd_seq_subscribers, src_list);
2447 else
2448 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2449 if (count++)
2450 snd_iprintf(buffer, ", ");
2451 snd_iprintf(buffer, "%d:%d",
2452 is_src ? s->info.dest.client : s->info.sender.client,
2453 is_src ? s->info.dest.port : s->info.sender.port);
2454 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2455 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2456 if (group->exclusive)
2457 snd_iprintf(buffer, "[ex]");
2458 }
2459 up_read(&group->list_mutex);
2460 snd_iprintf(buffer, "\n");
2461 }
2462
2463 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2464 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2465 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2466
2467 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2468
2469 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2470 struct snd_seq_client *client)
2471 {
2472 struct snd_seq_client_port *p;
2473
2474 mutex_lock(&client->ports_mutex);
2475 list_for_each_entry(p, &client->ports_list_head, list) {
2476 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2477 p->addr.port, p->name,
2478 FLAG_PERM_RD(p->capability),
2479 FLAG_PERM_WR(p->capability),
2480 FLAG_PERM_EX(p->capability),
2481 FLAG_PERM_DUPLEX(p->capability));
2482 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2483 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2484 }
2485 mutex_unlock(&client->ports_mutex);
2486 }
2487
2488
2489 void snd_seq_info_pool(struct snd_info_buffer *buffer,
2490 struct snd_seq_pool *pool, char *space);
2491
2492 /* exported to seq_info.c */
2493 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2494 struct snd_info_buffer *buffer)
2495 {
2496 int c;
2497 struct snd_seq_client *client;
2498
2499 snd_iprintf(buffer, "Client info\n");
2500 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2501 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2502 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2503 snd_iprintf(buffer, "\n");
2504
2505 /* list the client table */
2506 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2507 client = snd_seq_client_use_ptr(c);
2508 if (client == NULL)
2509 continue;
2510 if (client->type == NO_CLIENT) {
2511 snd_seq_client_unlock(client);
2512 continue;
2513 }
2514
2515 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2516 c, client->name,
2517 client->type == USER_CLIENT ? "User" : "Kernel");
2518 snd_seq_info_dump_ports(buffer, client);
2519 if (snd_seq_write_pool_allocated(client)) {
2520 snd_iprintf(buffer, " Output pool :\n");
2521 snd_seq_info_pool(buffer, client->pool, " ");
2522 }
2523 if (client->type == USER_CLIENT && client->data.user.fifo &&
2524 client->data.user.fifo->pool) {
2525 snd_iprintf(buffer, " Input pool :\n");
2526 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2527 }
2528 snd_seq_client_unlock(client);
2529 }
2530 }
2531 #endif /* CONFIG_PROC_FS */
2532
2533 /*---------------------------------------------------------------------------*/
2534
2535
2536 /*
2537 * REGISTRATION PART
2538 */
2539
2540 static const struct file_operations snd_seq_f_ops =
2541 {
2542 .owner = THIS_MODULE,
2543 .read = snd_seq_read,
2544 .write = snd_seq_write,
2545 .open = snd_seq_open,
2546 .release = snd_seq_release,
2547 .poll = snd_seq_poll,
2548 .unlocked_ioctl = snd_seq_ioctl,
2549 .compat_ioctl = snd_seq_ioctl_compat,
2550 };
2551
2552 /*
2553 * register sequencer device
2554 */
2555 int __init snd_sequencer_device_init(void)
2556 {
2557 int err;
2558
2559 if (mutex_lock_interruptible(&register_mutex))
2560 return -ERESTARTSYS;
2561
2562 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2563 &snd_seq_f_ops, NULL, "seq")) < 0) {
2564 mutex_unlock(&register_mutex);
2565 return err;
2566 }
2567
2568 mutex_unlock(&register_mutex);
2569
2570 return 0;
2571 }
2572
2573
2574
2575 /*
2576 * unregister sequencer device
2577 */
2578 void __exit snd_sequencer_device_done(void)
2579 {
2580 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2581 }
Stable & featurefull patchset based on Linus's git branch