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 <linux/init.h>
25 #include <linux/export.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
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
snd_enter_user(void)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
snd_leave_user(mm_segment_t fs)98 static inline void snd_leave_user(mm_segment_t fs)
99 {
100 set_fs(fs);
101 }
102
103 /*
104 */
snd_seq_file_flags(struct file * file)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
snd_seq_write_pool_allocated(struct snd_seq_client * client)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 */
clientptr(int clientid)123 static struct snd_seq_client *clientptr(int clientid)
124 {
125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
127 clientid);
128 return NULL;
129 }
130 return clienttab[clientid];
131 }
132
snd_seq_client_use_ptr(int clientid)133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
134 {
135 unsigned long flags;
136 struct snd_seq_client *client;
137
138 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
139 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
140 clientid);
141 return NULL;
142 }
143 spin_lock_irqsave(&clients_lock, flags);
144 client = clientptr(clientid);
145 if (client)
146 goto __lock;
147 if (clienttablock[clientid]) {
148 spin_unlock_irqrestore(&clients_lock, flags);
149 return NULL;
150 }
151 spin_unlock_irqrestore(&clients_lock, flags);
152 #ifdef CONFIG_MODULES
153 if (!in_interrupt()) {
154 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
155 static char card_requested[SNDRV_CARDS];
156 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
157 int idx;
158
159 if (!client_requested[clientid]) {
160 client_requested[clientid] = 1;
161 for (idx = 0; idx < 15; idx++) {
162 if (seq_client_load[idx] < 0)
163 break;
164 if (seq_client_load[idx] == clientid) {
165 request_module("snd-seq-client-%i",
166 clientid);
167 break;
168 }
169 }
170 }
171 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
172 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
173 SNDRV_SEQ_CLIENTS_PER_CARD;
174 if (card < snd_ecards_limit) {
175 if (! card_requested[card]) {
176 card_requested[card] = 1;
177 snd_request_card(card);
178 }
179 snd_seq_device_load_drivers();
180 }
181 }
182 spin_lock_irqsave(&clients_lock, flags);
183 client = clientptr(clientid);
184 if (client)
185 goto __lock;
186 spin_unlock_irqrestore(&clients_lock, flags);
187 }
188 #endif
189 return NULL;
190
191 __lock:
192 snd_use_lock_use(&client->use_lock);
193 spin_unlock_irqrestore(&clients_lock, flags);
194 return client;
195 }
196
usage_alloc(struct snd_seq_usage * res,int num)197 static void usage_alloc(struct snd_seq_usage *res, int num)
198 {
199 res->cur += num;
200 if (res->cur > res->peak)
201 res->peak = res->cur;
202 }
203
usage_free(struct snd_seq_usage * res,int num)204 static void usage_free(struct snd_seq_usage *res, int num)
205 {
206 res->cur -= num;
207 }
208
209 /* initialise data structures */
client_init_data(void)210 int __init client_init_data(void)
211 {
212 /* zap out the client table */
213 memset(&clienttablock, 0, sizeof(clienttablock));
214 memset(&clienttab, 0, sizeof(clienttab));
215 return 0;
216 }
217
218
seq_create_client1(int client_index,int poolsize)219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
220 {
221 unsigned long flags;
222 int c;
223 struct snd_seq_client *client;
224
225 /* init client data */
226 client = kzalloc(sizeof(*client), GFP_KERNEL);
227 if (client == NULL)
228 return NULL;
229 client->pool = snd_seq_pool_new(poolsize);
230 if (client->pool == NULL) {
231 kfree(client);
232 return NULL;
233 }
234 client->type = NO_CLIENT;
235 snd_use_lock_init(&client->use_lock);
236 rwlock_init(&client->ports_lock);
237 mutex_init(&client->ports_mutex);
238 INIT_LIST_HEAD(&client->ports_list_head);
239 mutex_init(&client->ioctl_mutex);
240
241 /* find free slot in the client table */
242 spin_lock_irqsave(&clients_lock, flags);
243 if (client_index < 0) {
244 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
245 c < SNDRV_SEQ_MAX_CLIENTS;
246 c++) {
247 if (clienttab[c] || clienttablock[c])
248 continue;
249 clienttab[client->number = c] = client;
250 spin_unlock_irqrestore(&clients_lock, flags);
251 return client;
252 }
253 } else {
254 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
255 clienttab[client->number = client_index] = client;
256 spin_unlock_irqrestore(&clients_lock, flags);
257 return client;
258 }
259 }
260 spin_unlock_irqrestore(&clients_lock, flags);
261 snd_seq_pool_delete(&client->pool);
262 kfree(client);
263 return NULL; /* no free slot found or busy, return failure code */
264 }
265
266
seq_free_client1(struct snd_seq_client * client)267 static int seq_free_client1(struct snd_seq_client *client)
268 {
269 unsigned long flags;
270
271 if (!client)
272 return 0;
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
seq_free_client(struct snd_seq_client * client)290 static void seq_free_client(struct snd_seq_client * client)
291 {
292 mutex_lock(®ister_mutex);
293 switch (client->type) {
294 case NO_CLIENT:
295 pr_warn("ALSA: 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 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
306 client->number, client->type);
307 }
308 mutex_unlock(®ister_mutex);
309
310 snd_seq_system_client_ev_client_exit(client->number);
311 }
312
313
314
315 /* -------------------------------------------------------- */
316
317 /* create a user client */
snd_seq_open(struct inode * inode,struct file * file)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 int err;
324
325 err = nonseekable_open(inode, file);
326 if (err < 0)
327 return err;
328
329 if (mutex_lock_interruptible(®ister_mutex))
330 return -ERESTARTSYS;
331 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
332 if (client == NULL) {
333 mutex_unlock(®ister_mutex);
334 return -ENOMEM; /* failure code */
335 }
336
337 mode = snd_seq_file_flags(file);
338 if (mode & SNDRV_SEQ_LFLG_INPUT)
339 client->accept_input = 1;
340 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
341 client->accept_output = 1;
342
343 user = &client->data.user;
344 user->fifo = NULL;
345 user->fifo_pool_size = 0;
346
347 if (mode & SNDRV_SEQ_LFLG_INPUT) {
348 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
349 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
350 if (user->fifo == NULL) {
351 seq_free_client1(client);
352 kfree(client);
353 mutex_unlock(®ister_mutex);
354 return -ENOMEM;
355 }
356 }
357
358 usage_alloc(&client_usage, 1);
359 client->type = USER_CLIENT;
360 mutex_unlock(®ister_mutex);
361
362 c = client->number;
363 file->private_data = client;
364
365 /* fill client data */
366 user->file = file;
367 sprintf(client->name, "Client-%d", c);
368
369 /* make others aware this new client */
370 snd_seq_system_client_ev_client_start(c);
371
372 return 0;
373 }
374
375 /* delete a user client */
snd_seq_release(struct inode * inode,struct file * file)376 static int snd_seq_release(struct inode *inode, struct file *file)
377 {
378 struct snd_seq_client *client = file->private_data;
379
380 if (client) {
381 seq_free_client(client);
382 if (client->data.user.fifo)
383 snd_seq_fifo_delete(&client->data.user.fifo);
384 kfree(client);
385 }
386
387 return 0;
388 }
389
390
391 /* handle client read() */
392 /* possible error values:
393 * -ENXIO invalid client or file open mode
394 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
395 * -EINVAL no enough user-space buffer to write the whole event
396 * -EFAULT seg. fault during copy to user space
397 */
snd_seq_read(struct file * file,char __user * buf,size_t count,loff_t * offset)398 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
399 loff_t *offset)
400 {
401 struct snd_seq_client *client = file->private_data;
402 struct snd_seq_fifo *fifo;
403 int err;
404 long result = 0;
405 struct snd_seq_event_cell *cell;
406
407 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
408 return -ENXIO;
409
410 if (!access_ok(VERIFY_WRITE, buf, count))
411 return -EFAULT;
412
413 /* check client structures are in place */
414 if (snd_BUG_ON(!client))
415 return -ENXIO;
416
417 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
418 return -ENXIO;
419
420 if (atomic_read(&fifo->overflow) > 0) {
421 /* buffer overflow is detected */
422 snd_seq_fifo_clear(fifo);
423 /* return error code */
424 return -ENOSPC;
425 }
426
427 cell = NULL;
428 err = 0;
429 snd_seq_fifo_lock(fifo);
430
431 /* while data available in queue */
432 while (count >= sizeof(struct snd_seq_event)) {
433 int nonblock;
434
435 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
436 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
437 break;
438 }
439 if (snd_seq_ev_is_variable(&cell->event)) {
440 struct snd_seq_event tmpev;
441 tmpev = cell->event;
442 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
443 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
444 err = -EFAULT;
445 break;
446 }
447 count -= sizeof(struct snd_seq_event);
448 buf += sizeof(struct snd_seq_event);
449 err = snd_seq_expand_var_event(&cell->event, count,
450 (char __force *)buf, 0,
451 sizeof(struct snd_seq_event));
452 if (err < 0)
453 break;
454 result += err;
455 count -= err;
456 buf += err;
457 } else {
458 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
459 err = -EFAULT;
460 break;
461 }
462 count -= sizeof(struct snd_seq_event);
463 buf += sizeof(struct snd_seq_event);
464 }
465 snd_seq_cell_free(cell);
466 cell = NULL; /* to be sure */
467 result += sizeof(struct snd_seq_event);
468 }
469
470 if (err < 0) {
471 if (cell)
472 snd_seq_fifo_cell_putback(fifo, cell);
473 if (err == -EAGAIN && result > 0)
474 err = 0;
475 }
476 snd_seq_fifo_unlock(fifo);
477
478 return (err < 0) ? err : result;
479 }
480
481
482 /*
483 * check access permission to the port
484 */
check_port_perm(struct snd_seq_client_port * port,unsigned int flags)485 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
486 {
487 if ((port->capability & flags) != flags)
488 return 0;
489 return flags;
490 }
491
492 /*
493 * check if the destination client is available, and return the pointer
494 * if filter is non-zero, client filter bitmap is tested.
495 */
get_event_dest_client(struct snd_seq_event * event,int filter)496 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
497 int filter)
498 {
499 struct snd_seq_client *dest;
500
501 dest = snd_seq_client_use_ptr(event->dest.client);
502 if (dest == NULL)
503 return NULL;
504 if (! dest->accept_input)
505 goto __not_avail;
506 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
507 ! test_bit(event->type, dest->event_filter))
508 goto __not_avail;
509 if (filter && !(dest->filter & filter))
510 goto __not_avail;
511
512 return dest; /* ok - accessible */
513 __not_avail:
514 snd_seq_client_unlock(dest);
515 return NULL;
516 }
517
518
519 /*
520 * Return the error event.
521 *
522 * If the receiver client is a user client, the original event is
523 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
524 * the original event is also variable length, the external data is
525 * copied after the event record.
526 * If the receiver client is a kernel client, the original event is
527 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
528 * kmalloc.
529 */
bounce_error_event(struct snd_seq_client * client,struct snd_seq_event * event,int err,int atomic,int hop)530 static int bounce_error_event(struct snd_seq_client *client,
531 struct snd_seq_event *event,
532 int err, int atomic, int hop)
533 {
534 struct snd_seq_event bounce_ev;
535 int result;
536
537 if (client == NULL ||
538 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
539 ! client->accept_input)
540 return 0; /* ignored */
541
542 /* set up quoted error */
543 memset(&bounce_ev, 0, sizeof(bounce_ev));
544 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
545 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
546 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
547 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
548 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
549 bounce_ev.dest.client = client->number;
550 bounce_ev.dest.port = event->source.port;
551 bounce_ev.data.quote.origin = event->dest;
552 bounce_ev.data.quote.event = event;
553 bounce_ev.data.quote.value = -err; /* use positive value */
554 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
555 if (result < 0) {
556 client->event_lost++;
557 return result;
558 }
559
560 return result;
561 }
562
563
564 /*
565 * rewrite the time-stamp of the event record with the curren time
566 * of the given queue.
567 * return non-zero if updated.
568 */
update_timestamp_of_queue(struct snd_seq_event * event,int queue,int real_time)569 static int update_timestamp_of_queue(struct snd_seq_event *event,
570 int queue, int real_time)
571 {
572 struct snd_seq_queue *q;
573
574 q = queueptr(queue);
575 if (! q)
576 return 0;
577 event->queue = queue;
578 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
579 if (real_time) {
580 event->time.time = snd_seq_timer_get_cur_time(q->timer);
581 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
582 } else {
583 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
584 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
585 }
586 queuefree(q);
587 return 1;
588 }
589
590
591 /*
592 * deliver an event to the specified destination.
593 * if filter is non-zero, client filter bitmap is tested.
594 *
595 * RETURN VALUE: 0 : if succeeded
596 * <0 : error
597 */
snd_seq_deliver_single_event(struct snd_seq_client * client,struct snd_seq_event * event,int filter,int atomic,int hop)598 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
599 struct snd_seq_event *event,
600 int filter, int atomic, int hop)
601 {
602 struct snd_seq_client *dest = NULL;
603 struct snd_seq_client_port *dest_port = NULL;
604 int result = -ENOENT;
605 int direct;
606
607 direct = snd_seq_ev_is_direct(event);
608
609 dest = get_event_dest_client(event, filter);
610 if (dest == NULL)
611 goto __skip;
612 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
613 if (dest_port == NULL)
614 goto __skip;
615
616 /* check permission */
617 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
618 result = -EPERM;
619 goto __skip;
620 }
621
622 if (dest_port->timestamping)
623 update_timestamp_of_queue(event, dest_port->time_queue,
624 dest_port->time_real);
625
626 switch (dest->type) {
627 case USER_CLIENT:
628 if (dest->data.user.fifo)
629 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
630 break;
631
632 case KERNEL_CLIENT:
633 if (dest_port->event_input == NULL)
634 break;
635 result = dest_port->event_input(event, direct,
636 dest_port->private_data,
637 atomic, hop);
638 break;
639 default:
640 break;
641 }
642
643 __skip:
644 if (dest_port)
645 snd_seq_port_unlock(dest_port);
646 if (dest)
647 snd_seq_client_unlock(dest);
648
649 if (result < 0 && !direct) {
650 result = bounce_error_event(client, event, result, atomic, hop);
651 }
652 return result;
653 }
654
655
656 /*
657 * send the event to all subscribers:
658 */
deliver_to_subscribers(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)659 static int deliver_to_subscribers(struct snd_seq_client *client,
660 struct snd_seq_event *event,
661 int atomic, int hop)
662 {
663 struct snd_seq_subscribers *subs;
664 int err, result = 0, num_ev = 0;
665 struct snd_seq_event event_saved;
666 struct snd_seq_client_port *src_port;
667 struct snd_seq_port_subs_info *grp;
668
669 src_port = snd_seq_port_use_ptr(client, event->source.port);
670 if (src_port == NULL)
671 return -EINVAL; /* invalid source port */
672 /* save original event record */
673 event_saved = *event;
674 grp = &src_port->c_src;
675
676 /* lock list */
677 if (atomic)
678 read_lock(&grp->list_lock);
679 else
680 down_read_nested(&grp->list_mutex, hop);
681 list_for_each_entry(subs, &grp->list_head, src_list) {
682 /* both ports ready? */
683 if (atomic_read(&subs->ref_count) != 2)
684 continue;
685 event->dest = subs->info.dest;
686 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
687 /* convert time according to flag with subscription */
688 update_timestamp_of_queue(event, subs->info.queue,
689 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
690 err = snd_seq_deliver_single_event(client, event,
691 0, atomic, hop);
692 if (err < 0) {
693 /* save first error that occurs and continue */
694 if (!result)
695 result = err;
696 continue;
697 }
698 num_ev++;
699 /* restore original event record */
700 *event = event_saved;
701 }
702 if (atomic)
703 read_unlock(&grp->list_lock);
704 else
705 up_read(&grp->list_mutex);
706 *event = event_saved; /* restore */
707 snd_seq_port_unlock(src_port);
708 return (result < 0) ? result : num_ev;
709 }
710
711
712 #ifdef SUPPORT_BROADCAST
713 /*
714 * broadcast to all ports:
715 */
port_broadcast_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)716 static int port_broadcast_event(struct snd_seq_client *client,
717 struct snd_seq_event *event,
718 int atomic, int hop)
719 {
720 int num_ev = 0, err, result = 0;
721 struct snd_seq_client *dest_client;
722 struct snd_seq_client_port *port;
723
724 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
725 if (dest_client == NULL)
726 return 0; /* no matching destination */
727
728 read_lock(&dest_client->ports_lock);
729 list_for_each_entry(port, &dest_client->ports_list_head, list) {
730 event->dest.port = port->addr.port;
731 /* pass NULL as source client to avoid error bounce */
732 err = snd_seq_deliver_single_event(NULL, event,
733 SNDRV_SEQ_FILTER_BROADCAST,
734 atomic, hop);
735 if (err < 0) {
736 /* save first error that occurs and continue */
737 if (!result)
738 result = err;
739 continue;
740 }
741 num_ev++;
742 }
743 read_unlock(&dest_client->ports_lock);
744 snd_seq_client_unlock(dest_client);
745 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
746 return (result < 0) ? result : num_ev;
747 }
748
749 /*
750 * send the event to all clients:
751 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
752 */
broadcast_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)753 static int broadcast_event(struct snd_seq_client *client,
754 struct snd_seq_event *event, int atomic, int hop)
755 {
756 int err, result = 0, num_ev = 0;
757 int dest;
758 struct snd_seq_addr addr;
759
760 addr = event->dest; /* save */
761
762 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
763 /* don't send to itself */
764 if (dest == client->number)
765 continue;
766 event->dest.client = dest;
767 event->dest.port = addr.port;
768 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
769 err = port_broadcast_event(client, event, atomic, hop);
770 else
771 /* pass NULL as source client to avoid error bounce */
772 err = snd_seq_deliver_single_event(NULL, event,
773 SNDRV_SEQ_FILTER_BROADCAST,
774 atomic, hop);
775 if (err < 0) {
776 /* save first error that occurs and continue */
777 if (!result)
778 result = err;
779 continue;
780 }
781 num_ev += err;
782 }
783 event->dest = addr; /* restore */
784 return (result < 0) ? result : num_ev;
785 }
786
787
788 /* multicast - not supported yet */
multicast_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)789 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
790 int atomic, int hop)
791 {
792 pr_debug("ALSA: seq: multicast not supported yet.\n");
793 return 0; /* ignored */
794 }
795 #endif /* SUPPORT_BROADCAST */
796
797
798 /* deliver an event to the destination port(s).
799 * if the event is to subscribers or broadcast, the event is dispatched
800 * to multiple targets.
801 *
802 * RETURN VALUE: n > 0 : the number of delivered events.
803 * n == 0 : the event was not passed to any client.
804 * n < 0 : error - event was not processed.
805 */
snd_seq_deliver_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)806 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
807 int atomic, int hop)
808 {
809 int result;
810
811 hop++;
812 if (hop >= SNDRV_SEQ_MAX_HOPS) {
813 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
814 event->source.client, event->source.port,
815 event->dest.client, event->dest.port);
816 return -EMLINK;
817 }
818
819 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
820 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
821 result = deliver_to_subscribers(client, event, atomic, hop);
822 #ifdef SUPPORT_BROADCAST
823 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
824 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
825 result = broadcast_event(client, event, atomic, hop);
826 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
827 result = multicast_event(client, event, atomic, hop);
828 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
829 result = port_broadcast_event(client, event, atomic, hop);
830 #endif
831 else
832 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
833
834 return result;
835 }
836
837 /*
838 * dispatch an event cell:
839 * This function is called only from queue check routines in timer
840 * interrupts or after enqueued.
841 * The event cell shall be released or re-queued in this function.
842 *
843 * RETURN VALUE: n > 0 : the number of delivered events.
844 * n == 0 : the event was not passed to any client.
845 * n < 0 : error - event was not processed.
846 */
snd_seq_dispatch_event(struct snd_seq_event_cell * cell,int atomic,int hop)847 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
848 {
849 struct snd_seq_client *client;
850 int result;
851
852 if (snd_BUG_ON(!cell))
853 return -EINVAL;
854
855 client = snd_seq_client_use_ptr(cell->event.source.client);
856 if (client == NULL) {
857 snd_seq_cell_free(cell); /* release this cell */
858 return -EINVAL;
859 }
860
861 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
862 /* NOTE event:
863 * the event cell is re-used as a NOTE-OFF event and
864 * enqueued again.
865 */
866 struct snd_seq_event tmpev, *ev;
867
868 /* reserve this event to enqueue note-off later */
869 tmpev = cell->event;
870 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
871 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
872
873 /*
874 * This was originally a note event. We now re-use the
875 * cell for the note-off event.
876 */
877
878 ev = &cell->event;
879 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
880 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
881
882 /* add the duration time */
883 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
884 case SNDRV_SEQ_TIME_STAMP_TICK:
885 ev->time.tick += ev->data.note.duration;
886 break;
887 case SNDRV_SEQ_TIME_STAMP_REAL:
888 /* unit for duration is ms */
889 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
890 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
891 ev->time.time.tv_nsec / 1000000000;
892 ev->time.time.tv_nsec %= 1000000000;
893 break;
894 }
895 ev->data.note.velocity = ev->data.note.off_velocity;
896
897 /* Now queue this cell as the note off event */
898 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
899 snd_seq_cell_free(cell); /* release this cell */
900
901 } else {
902 /* Normal events:
903 * event cell is freed after processing the event
904 */
905
906 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
907 snd_seq_cell_free(cell);
908 }
909
910 snd_seq_client_unlock(client);
911 return result;
912 }
913
914
915 /* Allocate a cell from client pool and enqueue it to queue:
916 * if pool is empty and blocking is TRUE, sleep until a new cell is
917 * available.
918 */
snd_seq_client_enqueue_event(struct snd_seq_client * client,struct snd_seq_event * event,struct file * file,int blocking,int atomic,int hop)919 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
920 struct snd_seq_event *event,
921 struct file *file, int blocking,
922 int atomic, int hop)
923 {
924 struct snd_seq_event_cell *cell;
925 int err;
926
927 /* special queue values - force direct passing */
928 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
929 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
930 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
931 } else
932 #ifdef SUPPORT_BROADCAST
933 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
934 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
935 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
936 }
937 #endif
938 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
939 /* check presence of source port */
940 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
941 if (src_port == NULL)
942 return -EINVAL;
943 snd_seq_port_unlock(src_port);
944 }
945
946 /* direct event processing without enqueued */
947 if (snd_seq_ev_is_direct(event)) {
948 if (event->type == SNDRV_SEQ_EVENT_NOTE)
949 return -EINVAL; /* this event must be enqueued! */
950 return snd_seq_deliver_event(client, event, atomic, hop);
951 }
952
953 /* Not direct, normal queuing */
954 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
955 return -EINVAL; /* invalid queue */
956 if (! snd_seq_write_pool_allocated(client))
957 return -ENXIO; /* queue is not allocated */
958
959 /* allocate an event cell */
960 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
961 if (err < 0)
962 return err;
963
964 /* we got a cell. enqueue it. */
965 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
966 snd_seq_cell_free(cell);
967 return err;
968 }
969
970 return 0;
971 }
972
973
974 /*
975 * check validity of event type and data length.
976 * return non-zero if invalid.
977 */
check_event_type_and_length(struct snd_seq_event * ev)978 static int check_event_type_and_length(struct snd_seq_event *ev)
979 {
980 switch (snd_seq_ev_length_type(ev)) {
981 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
982 if (snd_seq_ev_is_variable_type(ev))
983 return -EINVAL;
984 break;
985 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
986 if (! snd_seq_ev_is_variable_type(ev) ||
987 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
988 return -EINVAL;
989 break;
990 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
991 if (! snd_seq_ev_is_direct(ev))
992 return -EINVAL;
993 break;
994 }
995 return 0;
996 }
997
998
999 /* handle write() */
1000 /* possible error values:
1001 * -ENXIO invalid client or file open mode
1002 * -ENOMEM malloc failed
1003 * -EFAULT seg. fault during copy from user space
1004 * -EINVAL invalid event
1005 * -EAGAIN no space in output pool
1006 * -EINTR interrupts while sleep
1007 * -EMLINK too many hops
1008 * others depends on return value from driver callback
1009 */
snd_seq_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)1010 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1011 size_t count, loff_t *offset)
1012 {
1013 struct snd_seq_client *client = file->private_data;
1014 int written = 0, len;
1015 int err = -EINVAL;
1016 struct snd_seq_event event;
1017
1018 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1019 return -ENXIO;
1020
1021 /* check client structures are in place */
1022 if (snd_BUG_ON(!client))
1023 return -ENXIO;
1024
1025 if (!client->accept_output || client->pool == NULL)
1026 return -ENXIO;
1027
1028 /* allocate the pool now if the pool is not allocated yet */
1029 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1030 if (snd_seq_pool_init(client->pool) < 0)
1031 return -ENOMEM;
1032 }
1033
1034 /* only process whole events */
1035 while (count >= sizeof(struct snd_seq_event)) {
1036 /* Read in the event header from the user */
1037 len = sizeof(event);
1038 if (copy_from_user(&event, buf, len)) {
1039 err = -EFAULT;
1040 break;
1041 }
1042 event.source.client = client->number; /* fill in client number */
1043 /* Check for extension data length */
1044 if (check_event_type_and_length(&event)) {
1045 err = -EINVAL;
1046 break;
1047 }
1048
1049 /* check for special events */
1050 if (event.type == SNDRV_SEQ_EVENT_NONE)
1051 goto __skip_event;
1052 else if (snd_seq_ev_is_reserved(&event)) {
1053 err = -EINVAL;
1054 break;
1055 }
1056
1057 if (snd_seq_ev_is_variable(&event)) {
1058 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1059 if ((size_t)(extlen + len) > count) {
1060 /* back out, will get an error this time or next */
1061 err = -EINVAL;
1062 break;
1063 }
1064 /* set user space pointer */
1065 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1066 event.data.ext.ptr = (char __force *)buf
1067 + sizeof(struct snd_seq_event);
1068 len += extlen; /* increment data length */
1069 } else {
1070 #ifdef CONFIG_COMPAT
1071 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1072 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1073 event.data.ext.ptr = ptr;
1074 }
1075 #endif
1076 }
1077
1078 /* ok, enqueue it */
1079 err = snd_seq_client_enqueue_event(client, &event, file,
1080 !(file->f_flags & O_NONBLOCK),
1081 0, 0);
1082 if (err < 0)
1083 break;
1084
1085 __skip_event:
1086 /* Update pointers and counts */
1087 count -= len;
1088 buf += len;
1089 written += len;
1090 }
1091
1092 return written ? written : err;
1093 }
1094
1095
1096 /*
1097 * handle polling
1098 */
snd_seq_poll(struct file * file,poll_table * wait)1099 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1100 {
1101 struct snd_seq_client *client = file->private_data;
1102 unsigned int mask = 0;
1103
1104 /* check client structures are in place */
1105 if (snd_BUG_ON(!client))
1106 return -ENXIO;
1107
1108 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1109 client->data.user.fifo) {
1110
1111 /* check if data is available in the outqueue */
1112 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1113 mask |= POLLIN | POLLRDNORM;
1114 }
1115
1116 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1117
1118 /* check if data is available in the pool */
1119 if (!snd_seq_write_pool_allocated(client) ||
1120 snd_seq_pool_poll_wait(client->pool, file, wait))
1121 mask |= POLLOUT | POLLWRNORM;
1122 }
1123
1124 return mask;
1125 }
1126
1127
1128 /*-----------------------------------------------------*/
1129
1130
1131 /* SYSTEM_INFO ioctl() */
snd_seq_ioctl_system_info(struct snd_seq_client * client,void __user * arg)1132 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1133 {
1134 struct snd_seq_system_info info;
1135
1136 memset(&info, 0, sizeof(info));
1137 /* fill the info fields */
1138 info.queues = SNDRV_SEQ_MAX_QUEUES;
1139 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1140 info.ports = 256; /* fixed limit */
1141 info.channels = 256; /* fixed limit */
1142 info.cur_clients = client_usage.cur;
1143 info.cur_queues = snd_seq_queue_get_cur_queues();
1144
1145 if (copy_to_user(arg, &info, sizeof(info)))
1146 return -EFAULT;
1147 return 0;
1148 }
1149
1150
1151 /* RUNNING_MODE ioctl() */
snd_seq_ioctl_running_mode(struct snd_seq_client * client,void __user * arg)1152 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1153 {
1154 struct snd_seq_running_info info;
1155 struct snd_seq_client *cptr;
1156 int err = 0;
1157
1158 if (copy_from_user(&info, arg, sizeof(info)))
1159 return -EFAULT;
1160
1161 /* requested client number */
1162 cptr = snd_seq_client_use_ptr(info.client);
1163 if (cptr == NULL)
1164 return -ENOENT; /* don't change !!! */
1165
1166 #ifdef SNDRV_BIG_ENDIAN
1167 if (! info.big_endian) {
1168 err = -EINVAL;
1169 goto __err;
1170 }
1171 #else
1172 if (info.big_endian) {
1173 err = -EINVAL;
1174 goto __err;
1175 }
1176
1177 #endif
1178 if (info.cpu_mode > sizeof(long)) {
1179 err = -EINVAL;
1180 goto __err;
1181 }
1182 cptr->convert32 = (info.cpu_mode < sizeof(long));
1183 __err:
1184 snd_seq_client_unlock(cptr);
1185 return err;
1186 }
1187
1188 /* CLIENT_INFO ioctl() */
get_client_info(struct snd_seq_client * cptr,struct snd_seq_client_info * info)1189 static void get_client_info(struct snd_seq_client *cptr,
1190 struct snd_seq_client_info *info)
1191 {
1192 info->client = cptr->number;
1193
1194 /* fill the info fields */
1195 info->type = cptr->type;
1196 strcpy(info->name, cptr->name);
1197 info->filter = cptr->filter;
1198 info->event_lost = cptr->event_lost;
1199 memcpy(info->event_filter, cptr->event_filter, 32);
1200 info->num_ports = cptr->num_ports;
1201 memset(info->reserved, 0, sizeof(info->reserved));
1202 }
1203
snd_seq_ioctl_get_client_info(struct snd_seq_client * client,void __user * arg)1204 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1205 void __user *arg)
1206 {
1207 struct snd_seq_client *cptr;
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 /* requested client number */
1214 cptr = snd_seq_client_use_ptr(client_info.client);
1215 if (cptr == NULL)
1216 return -ENOENT; /* don't change !!! */
1217
1218 get_client_info(cptr, &client_info);
1219 snd_seq_client_unlock(cptr);
1220
1221 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1222 return -EFAULT;
1223 return 0;
1224 }
1225
1226
1227 /* CLIENT_INFO ioctl() */
snd_seq_ioctl_set_client_info(struct snd_seq_client * client,void __user * arg)1228 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1229 void __user *arg)
1230 {
1231 struct snd_seq_client_info client_info;
1232
1233 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1234 return -EFAULT;
1235
1236 /* it is not allowed to set the info fields for an another client */
1237 if (client->number != client_info.client)
1238 return -EPERM;
1239 /* also client type must be set now */
1240 if (client->type != client_info.type)
1241 return -EINVAL;
1242
1243 /* fill the info fields */
1244 if (client_info.name[0])
1245 strlcpy(client->name, client_info.name, sizeof(client->name));
1246
1247 client->filter = client_info.filter;
1248 client->event_lost = client_info.event_lost;
1249 memcpy(client->event_filter, client_info.event_filter, 32);
1250
1251 return 0;
1252 }
1253
1254
1255 /*
1256 * CREATE PORT ioctl()
1257 */
snd_seq_ioctl_create_port(struct snd_seq_client * client,void __user * arg)1258 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1259 void __user *arg)
1260 {
1261 struct snd_seq_client_port *port;
1262 struct snd_seq_port_info info;
1263 struct snd_seq_port_callback *callback;
1264 int port_idx;
1265
1266 if (copy_from_user(&info, arg, sizeof(info)))
1267 return -EFAULT;
1268
1269 /* it is not allowed to create the port for an another client */
1270 if (info.addr.client != client->number)
1271 return -EPERM;
1272
1273 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1274 if (port == NULL)
1275 return -ENOMEM;
1276
1277 if (client->type == USER_CLIENT && info.kernel) {
1278 port_idx = port->addr.port;
1279 snd_seq_port_unlock(port);
1280 snd_seq_delete_port(client, port_idx);
1281 return -EINVAL;
1282 }
1283 if (client->type == KERNEL_CLIENT) {
1284 if ((callback = info.kernel) != NULL) {
1285 if (callback->owner)
1286 port->owner = callback->owner;
1287 port->private_data = callback->private_data;
1288 port->private_free = callback->private_free;
1289 port->callback_all = callback->callback_all;
1290 port->event_input = callback->event_input;
1291 port->c_src.open = callback->subscribe;
1292 port->c_src.close = callback->unsubscribe;
1293 port->c_dest.open = callback->use;
1294 port->c_dest.close = callback->unuse;
1295 }
1296 }
1297
1298 info.addr = port->addr;
1299
1300 snd_seq_set_port_info(port, &info);
1301 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1302 snd_seq_port_unlock(port);
1303
1304 if (copy_to_user(arg, &info, sizeof(info)))
1305 return -EFAULT;
1306
1307 return 0;
1308 }
1309
1310 /*
1311 * DELETE PORT ioctl()
1312 */
snd_seq_ioctl_delete_port(struct snd_seq_client * client,void __user * arg)1313 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1314 void __user *arg)
1315 {
1316 struct snd_seq_port_info info;
1317 int err;
1318
1319 /* set passed parameters */
1320 if (copy_from_user(&info, arg, sizeof(info)))
1321 return -EFAULT;
1322
1323 /* it is not allowed to remove the port for an another client */
1324 if (info.addr.client != client->number)
1325 return -EPERM;
1326
1327 err = snd_seq_delete_port(client, info.addr.port);
1328 if (err >= 0)
1329 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1330 return err;
1331 }
1332
1333
1334 /*
1335 * GET_PORT_INFO ioctl() (on any client)
1336 */
snd_seq_ioctl_get_port_info(struct snd_seq_client * client,void __user * arg)1337 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1338 void __user *arg)
1339 {
1340 struct snd_seq_client *cptr;
1341 struct snd_seq_client_port *port;
1342 struct snd_seq_port_info info;
1343
1344 if (copy_from_user(&info, arg, sizeof(info)))
1345 return -EFAULT;
1346 cptr = snd_seq_client_use_ptr(info.addr.client);
1347 if (cptr == NULL)
1348 return -ENXIO;
1349
1350 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1351 if (port == NULL) {
1352 snd_seq_client_unlock(cptr);
1353 return -ENOENT; /* don't change */
1354 }
1355
1356 /* get port info */
1357 snd_seq_get_port_info(port, &info);
1358 snd_seq_port_unlock(port);
1359 snd_seq_client_unlock(cptr);
1360
1361 if (copy_to_user(arg, &info, sizeof(info)))
1362 return -EFAULT;
1363 return 0;
1364 }
1365
1366
1367 /*
1368 * SET_PORT_INFO ioctl() (only ports on this/own client)
1369 */
snd_seq_ioctl_set_port_info(struct snd_seq_client * client,void __user * arg)1370 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1371 void __user *arg)
1372 {
1373 struct snd_seq_client_port *port;
1374 struct snd_seq_port_info info;
1375
1376 if (copy_from_user(&info, arg, sizeof(info)))
1377 return -EFAULT;
1378
1379 if (info.addr.client != client->number) /* only set our own ports ! */
1380 return -EPERM;
1381 port = snd_seq_port_use_ptr(client, info.addr.port);
1382 if (port) {
1383 snd_seq_set_port_info(port, &info);
1384 snd_seq_port_unlock(port);
1385 }
1386 return 0;
1387 }
1388
1389
1390 /*
1391 * port subscription (connection)
1392 */
1393 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1394 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1395
check_subscription_permission(struct snd_seq_client * client,struct snd_seq_client_port * sport,struct snd_seq_client_port * dport,struct snd_seq_port_subscribe * subs)1396 static int check_subscription_permission(struct snd_seq_client *client,
1397 struct snd_seq_client_port *sport,
1398 struct snd_seq_client_port *dport,
1399 struct snd_seq_port_subscribe *subs)
1400 {
1401 if (client->number != subs->sender.client &&
1402 client->number != subs->dest.client) {
1403 /* connection by third client - check export permission */
1404 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1405 return -EPERM;
1406 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1407 return -EPERM;
1408 }
1409
1410 /* check read permission */
1411 /* if sender or receiver is the subscribing client itself,
1412 * no permission check is necessary
1413 */
1414 if (client->number != subs->sender.client) {
1415 if (! check_port_perm(sport, PERM_RD))
1416 return -EPERM;
1417 }
1418 /* check write permission */
1419 if (client->number != subs->dest.client) {
1420 if (! check_port_perm(dport, PERM_WR))
1421 return -EPERM;
1422 }
1423 return 0;
1424 }
1425
1426 /*
1427 * send an subscription notify event to user client:
1428 * client must be user client.
1429 */
snd_seq_client_notify_subscription(int client,int port,struct snd_seq_port_subscribe * info,int evtype)1430 int snd_seq_client_notify_subscription(int client, int port,
1431 struct snd_seq_port_subscribe *info,
1432 int evtype)
1433 {
1434 struct snd_seq_event event;
1435
1436 memset(&event, 0, sizeof(event));
1437 event.type = evtype;
1438 event.data.connect.dest = info->dest;
1439 event.data.connect.sender = info->sender;
1440
1441 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1442 }
1443
1444
1445 /*
1446 * add to port's subscription list IOCTL interface
1447 */
snd_seq_ioctl_subscribe_port(struct snd_seq_client * client,void __user * arg)1448 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1449 void __user *arg)
1450 {
1451 int result = -EINVAL;
1452 struct snd_seq_client *receiver = NULL, *sender = NULL;
1453 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1454 struct snd_seq_port_subscribe subs;
1455
1456 if (copy_from_user(&subs, arg, sizeof(subs)))
1457 return -EFAULT;
1458
1459 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1460 goto __end;
1461 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1462 goto __end;
1463 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1464 goto __end;
1465 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1466 goto __end;
1467
1468 result = check_subscription_permission(client, sport, dport, &subs);
1469 if (result < 0)
1470 goto __end;
1471
1472 /* connect them */
1473 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1474 if (! result) /* broadcast announce */
1475 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1476 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1477 __end:
1478 if (sport)
1479 snd_seq_port_unlock(sport);
1480 if (dport)
1481 snd_seq_port_unlock(dport);
1482 if (sender)
1483 snd_seq_client_unlock(sender);
1484 if (receiver)
1485 snd_seq_client_unlock(receiver);
1486 return result;
1487 }
1488
1489
1490 /*
1491 * remove from port's subscription list
1492 */
snd_seq_ioctl_unsubscribe_port(struct snd_seq_client * client,void __user * arg)1493 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1494 void __user *arg)
1495 {
1496 int result = -ENXIO;
1497 struct snd_seq_client *receiver = NULL, *sender = NULL;
1498 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1499 struct snd_seq_port_subscribe subs;
1500
1501 if (copy_from_user(&subs, arg, sizeof(subs)))
1502 return -EFAULT;
1503
1504 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1505 goto __end;
1506 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1507 goto __end;
1508 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1509 goto __end;
1510 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1511 goto __end;
1512
1513 result = check_subscription_permission(client, sport, dport, &subs);
1514 if (result < 0)
1515 goto __end;
1516
1517 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1518 if (! result) /* broadcast announce */
1519 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1520 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1521 __end:
1522 if (sport)
1523 snd_seq_port_unlock(sport);
1524 if (dport)
1525 snd_seq_port_unlock(dport);
1526 if (sender)
1527 snd_seq_client_unlock(sender);
1528 if (receiver)
1529 snd_seq_client_unlock(receiver);
1530 return result;
1531 }
1532
1533
1534 /* CREATE_QUEUE ioctl() */
snd_seq_ioctl_create_queue(struct snd_seq_client * client,void __user * arg)1535 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1536 void __user *arg)
1537 {
1538 struct snd_seq_queue_info info;
1539 int result;
1540 struct snd_seq_queue *q;
1541
1542 if (copy_from_user(&info, arg, sizeof(info)))
1543 return -EFAULT;
1544
1545 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1546 if (result < 0)
1547 return result;
1548
1549 q = queueptr(result);
1550 if (q == NULL)
1551 return -EINVAL;
1552
1553 info.queue = q->queue;
1554 info.locked = q->locked;
1555 info.owner = q->owner;
1556
1557 /* set queue name */
1558 if (! info.name[0])
1559 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1560 strlcpy(q->name, info.name, sizeof(q->name));
1561 queuefree(q);
1562
1563 if (copy_to_user(arg, &info, sizeof(info)))
1564 return -EFAULT;
1565
1566 return 0;
1567 }
1568
1569 /* DELETE_QUEUE ioctl() */
snd_seq_ioctl_delete_queue(struct snd_seq_client * client,void __user * arg)1570 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1571 void __user *arg)
1572 {
1573 struct snd_seq_queue_info info;
1574
1575 if (copy_from_user(&info, arg, sizeof(info)))
1576 return -EFAULT;
1577
1578 return snd_seq_queue_delete(client->number, info.queue);
1579 }
1580
1581 /* GET_QUEUE_INFO ioctl() */
snd_seq_ioctl_get_queue_info(struct snd_seq_client * client,void __user * arg)1582 static int snd_seq_ioctl_get_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 q = queueptr(info.queue);
1592 if (q == NULL)
1593 return -EINVAL;
1594
1595 memset(&info, 0, sizeof(info));
1596 info.queue = q->queue;
1597 info.owner = q->owner;
1598 info.locked = q->locked;
1599 strlcpy(info.name, q->name, sizeof(info.name));
1600 queuefree(q);
1601
1602 if (copy_to_user(arg, &info, sizeof(info)))
1603 return -EFAULT;
1604
1605 return 0;
1606 }
1607
1608 /* SET_QUEUE_INFO ioctl() */
snd_seq_ioctl_set_queue_info(struct snd_seq_client * client,void __user * arg)1609 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1610 void __user *arg)
1611 {
1612 struct snd_seq_queue_info info;
1613 struct snd_seq_queue *q;
1614
1615 if (copy_from_user(&info, arg, sizeof(info)))
1616 return -EFAULT;
1617
1618 if (info.owner != client->number)
1619 return -EINVAL;
1620
1621 /* change owner/locked permission */
1622 if (snd_seq_queue_check_access(info.queue, client->number)) {
1623 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1624 return -EPERM;
1625 if (info.locked)
1626 snd_seq_queue_use(info.queue, client->number, 1);
1627 } else {
1628 return -EPERM;
1629 }
1630
1631 q = queueptr(info.queue);
1632 if (! q)
1633 return -EINVAL;
1634 if (q->owner != client->number) {
1635 queuefree(q);
1636 return -EPERM;
1637 }
1638 strlcpy(q->name, info.name, sizeof(q->name));
1639 queuefree(q);
1640
1641 return 0;
1642 }
1643
1644 /* GET_NAMED_QUEUE ioctl() */
snd_seq_ioctl_get_named_queue(struct snd_seq_client * client,void __user * arg)1645 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1646 {
1647 struct snd_seq_queue_info info;
1648 struct snd_seq_queue *q;
1649
1650 if (copy_from_user(&info, arg, sizeof(info)))
1651 return -EFAULT;
1652
1653 q = snd_seq_queue_find_name(info.name);
1654 if (q == NULL)
1655 return -EINVAL;
1656 info.queue = q->queue;
1657 info.owner = q->owner;
1658 info.locked = q->locked;
1659 queuefree(q);
1660
1661 if (copy_to_user(arg, &info, sizeof(info)))
1662 return -EFAULT;
1663
1664 return 0;
1665 }
1666
1667 /* GET_QUEUE_STATUS ioctl() */
snd_seq_ioctl_get_queue_status(struct snd_seq_client * client,void __user * arg)1668 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1669 void __user *arg)
1670 {
1671 struct snd_seq_queue_status status;
1672 struct snd_seq_queue *queue;
1673 struct snd_seq_timer *tmr;
1674
1675 if (copy_from_user(&status, arg, sizeof(status)))
1676 return -EFAULT;
1677
1678 queue = queueptr(status.queue);
1679 if (queue == NULL)
1680 return -EINVAL;
1681 memset(&status, 0, sizeof(status));
1682 status.queue = queue->queue;
1683
1684 tmr = queue->timer;
1685 status.events = queue->tickq->cells + queue->timeq->cells;
1686
1687 status.time = snd_seq_timer_get_cur_time(tmr);
1688 status.tick = snd_seq_timer_get_cur_tick(tmr);
1689
1690 status.running = tmr->running;
1691
1692 status.flags = queue->flags;
1693 queuefree(queue);
1694
1695 if (copy_to_user(arg, &status, sizeof(status)))
1696 return -EFAULT;
1697 return 0;
1698 }
1699
1700
1701 /* GET_QUEUE_TEMPO ioctl() */
snd_seq_ioctl_get_queue_tempo(struct snd_seq_client * client,void __user * arg)1702 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1703 void __user *arg)
1704 {
1705 struct snd_seq_queue_tempo tempo;
1706 struct snd_seq_queue *queue;
1707 struct snd_seq_timer *tmr;
1708
1709 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1710 return -EFAULT;
1711
1712 queue = queueptr(tempo.queue);
1713 if (queue == NULL)
1714 return -EINVAL;
1715 memset(&tempo, 0, sizeof(tempo));
1716 tempo.queue = queue->queue;
1717
1718 tmr = queue->timer;
1719
1720 tempo.tempo = tmr->tempo;
1721 tempo.ppq = tmr->ppq;
1722 tempo.skew_value = tmr->skew;
1723 tempo.skew_base = tmr->skew_base;
1724 queuefree(queue);
1725
1726 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1727 return -EFAULT;
1728 return 0;
1729 }
1730
1731
1732 /* SET_QUEUE_TEMPO ioctl() */
snd_seq_set_queue_tempo(int client,struct snd_seq_queue_tempo * tempo)1733 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1734 {
1735 if (!snd_seq_queue_check_access(tempo->queue, client))
1736 return -EPERM;
1737 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1738 }
1739
1740 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1741
snd_seq_ioctl_set_queue_tempo(struct snd_seq_client * client,void __user * arg)1742 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1743 void __user *arg)
1744 {
1745 int result;
1746 struct snd_seq_queue_tempo tempo;
1747
1748 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1749 return -EFAULT;
1750
1751 result = snd_seq_set_queue_tempo(client->number, &tempo);
1752 return result < 0 ? result : 0;
1753 }
1754
1755
1756 /* GET_QUEUE_TIMER ioctl() */
snd_seq_ioctl_get_queue_timer(struct snd_seq_client * client,void __user * arg)1757 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1758 void __user *arg)
1759 {
1760 struct snd_seq_queue_timer timer;
1761 struct snd_seq_queue *queue;
1762 struct snd_seq_timer *tmr;
1763
1764 if (copy_from_user(&timer, arg, sizeof(timer)))
1765 return -EFAULT;
1766
1767 queue = queueptr(timer.queue);
1768 if (queue == NULL)
1769 return -EINVAL;
1770
1771 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1772 queuefree(queue);
1773 return -ERESTARTSYS;
1774 }
1775 tmr = queue->timer;
1776 memset(&timer, 0, sizeof(timer));
1777 timer.queue = queue->queue;
1778
1779 timer.type = tmr->type;
1780 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1781 timer.u.alsa.id = tmr->alsa_id;
1782 timer.u.alsa.resolution = tmr->preferred_resolution;
1783 }
1784 mutex_unlock(&queue->timer_mutex);
1785 queuefree(queue);
1786
1787 if (copy_to_user(arg, &timer, sizeof(timer)))
1788 return -EFAULT;
1789 return 0;
1790 }
1791
1792
1793 /* SET_QUEUE_TIMER ioctl() */
snd_seq_ioctl_set_queue_timer(struct snd_seq_client * client,void __user * arg)1794 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1795 void __user *arg)
1796 {
1797 int result = 0;
1798 struct snd_seq_queue_timer timer;
1799
1800 if (copy_from_user(&timer, arg, sizeof(timer)))
1801 return -EFAULT;
1802
1803 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1804 return -EINVAL;
1805
1806 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1807 struct snd_seq_queue *q;
1808 struct snd_seq_timer *tmr;
1809
1810 q = queueptr(timer.queue);
1811 if (q == NULL)
1812 return -ENXIO;
1813 if (mutex_lock_interruptible(&q->timer_mutex)) {
1814 queuefree(q);
1815 return -ERESTARTSYS;
1816 }
1817 tmr = q->timer;
1818 snd_seq_queue_timer_close(timer.queue);
1819 tmr->type = timer.type;
1820 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1821 tmr->alsa_id = timer.u.alsa.id;
1822 tmr->preferred_resolution = timer.u.alsa.resolution;
1823 }
1824 result = snd_seq_queue_timer_open(timer.queue);
1825 mutex_unlock(&q->timer_mutex);
1826 queuefree(q);
1827 } else {
1828 return -EPERM;
1829 }
1830
1831 return result;
1832 }
1833
1834
1835 /* GET_QUEUE_CLIENT ioctl() */
snd_seq_ioctl_get_queue_client(struct snd_seq_client * client,void __user * arg)1836 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1837 void __user *arg)
1838 {
1839 struct snd_seq_queue_client info;
1840 int used;
1841
1842 if (copy_from_user(&info, arg, sizeof(info)))
1843 return -EFAULT;
1844
1845 used = snd_seq_queue_is_used(info.queue, client->number);
1846 if (used < 0)
1847 return -EINVAL;
1848 info.used = used;
1849 info.client = client->number;
1850
1851 if (copy_to_user(arg, &info, sizeof(info)))
1852 return -EFAULT;
1853 return 0;
1854 }
1855
1856
1857 /* SET_QUEUE_CLIENT ioctl() */
snd_seq_ioctl_set_queue_client(struct snd_seq_client * client,void __user * arg)1858 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1859 void __user *arg)
1860 {
1861 int err;
1862 struct snd_seq_queue_client info;
1863
1864 if (copy_from_user(&info, arg, sizeof(info)))
1865 return -EFAULT;
1866
1867 if (info.used >= 0) {
1868 err = snd_seq_queue_use(info.queue, client->number, info.used);
1869 if (err < 0)
1870 return err;
1871 }
1872
1873 return snd_seq_ioctl_get_queue_client(client, arg);
1874 }
1875
1876
1877 /* GET_CLIENT_POOL ioctl() */
snd_seq_ioctl_get_client_pool(struct snd_seq_client * client,void __user * arg)1878 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1879 void __user *arg)
1880 {
1881 struct snd_seq_client_pool info;
1882 struct snd_seq_client *cptr;
1883
1884 if (copy_from_user(&info, arg, sizeof(info)))
1885 return -EFAULT;
1886
1887 cptr = snd_seq_client_use_ptr(info.client);
1888 if (cptr == NULL)
1889 return -ENOENT;
1890 memset(&info, 0, sizeof(info));
1891 info.output_pool = cptr->pool->size;
1892 info.output_room = cptr->pool->room;
1893 info.output_free = info.output_pool;
1894 info.output_free = snd_seq_unused_cells(cptr->pool);
1895 if (cptr->type == USER_CLIENT) {
1896 info.input_pool = cptr->data.user.fifo_pool_size;
1897 info.input_free = info.input_pool;
1898 if (cptr->data.user.fifo)
1899 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1900 } else {
1901 info.input_pool = 0;
1902 info.input_free = 0;
1903 }
1904 snd_seq_client_unlock(cptr);
1905
1906 if (copy_to_user(arg, &info, sizeof(info)))
1907 return -EFAULT;
1908 return 0;
1909 }
1910
1911 /* SET_CLIENT_POOL ioctl() */
snd_seq_ioctl_set_client_pool(struct snd_seq_client * client,void __user * arg)1912 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1913 void __user *arg)
1914 {
1915 struct snd_seq_client_pool info;
1916 int rc;
1917
1918 if (copy_from_user(&info, arg, sizeof(info)))
1919 return -EFAULT;
1920
1921 if (client->number != info.client)
1922 return -EINVAL; /* can't change other clients */
1923
1924 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1925 (! snd_seq_write_pool_allocated(client) ||
1926 info.output_pool != client->pool->size)) {
1927 if (snd_seq_write_pool_allocated(client)) {
1928 /* remove all existing cells */
1929 snd_seq_pool_mark_closing(client->pool);
1930 snd_seq_queue_client_leave_cells(client->number);
1931 snd_seq_pool_done(client->pool);
1932 }
1933 client->pool->size = info.output_pool;
1934 rc = snd_seq_pool_init(client->pool);
1935 if (rc < 0)
1936 return rc;
1937 }
1938 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1939 info.input_pool >= 1 &&
1940 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1941 info.input_pool != client->data.user.fifo_pool_size) {
1942 /* change pool size */
1943 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1944 if (rc < 0)
1945 return rc;
1946 client->data.user.fifo_pool_size = info.input_pool;
1947 }
1948 if (info.output_room >= 1 &&
1949 info.output_room <= client->pool->size) {
1950 client->pool->room = info.output_room;
1951 }
1952
1953 return snd_seq_ioctl_get_client_pool(client, arg);
1954 }
1955
1956
1957 /* REMOVE_EVENTS ioctl() */
snd_seq_ioctl_remove_events(struct snd_seq_client * client,void __user * arg)1958 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1959 void __user *arg)
1960 {
1961 struct snd_seq_remove_events info;
1962
1963 if (copy_from_user(&info, arg, sizeof(info)))
1964 return -EFAULT;
1965
1966 /*
1967 * Input mostly not implemented XXX.
1968 */
1969 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1970 /*
1971 * No restrictions so for a user client we can clear
1972 * the whole fifo
1973 */
1974 if (client->type == USER_CLIENT && client->data.user.fifo)
1975 snd_seq_fifo_clear(client->data.user.fifo);
1976 }
1977
1978 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1979 snd_seq_queue_remove_cells(client->number, &info);
1980
1981 return 0;
1982 }
1983
1984
1985 /*
1986 * get subscription info
1987 */
snd_seq_ioctl_get_subscription(struct snd_seq_client * client,void __user * arg)1988 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1989 void __user *arg)
1990 {
1991 int result;
1992 struct snd_seq_client *sender = NULL;
1993 struct snd_seq_client_port *sport = NULL;
1994 struct snd_seq_port_subscribe subs;
1995 struct snd_seq_subscribers *p;
1996
1997 if (copy_from_user(&subs, arg, sizeof(subs)))
1998 return -EFAULT;
1999
2000 result = -EINVAL;
2001 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
2002 goto __end;
2003 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
2004 goto __end;
2005 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2006 if (p) {
2007 result = 0;
2008 subs = p->info;
2009 } else
2010 result = -ENOENT;
2011
2012 __end:
2013 if (sport)
2014 snd_seq_port_unlock(sport);
2015 if (sender)
2016 snd_seq_client_unlock(sender);
2017 if (result >= 0) {
2018 if (copy_to_user(arg, &subs, sizeof(subs)))
2019 return -EFAULT;
2020 }
2021 return result;
2022 }
2023
2024
2025 /*
2026 * get subscription info - check only its presence
2027 */
snd_seq_ioctl_query_subs(struct snd_seq_client * client,void __user * arg)2028 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2029 void __user *arg)
2030 {
2031 int result = -ENXIO;
2032 struct snd_seq_client *cptr = NULL;
2033 struct snd_seq_client_port *port = NULL;
2034 struct snd_seq_query_subs subs;
2035 struct snd_seq_port_subs_info *group;
2036 struct list_head *p;
2037 int i;
2038
2039 if (copy_from_user(&subs, arg, sizeof(subs)))
2040 return -EFAULT;
2041
2042 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2043 goto __end;
2044 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2045 goto __end;
2046
2047 switch (subs.type) {
2048 case SNDRV_SEQ_QUERY_SUBS_READ:
2049 group = &port->c_src;
2050 break;
2051 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2052 group = &port->c_dest;
2053 break;
2054 default:
2055 goto __end;
2056 }
2057
2058 down_read(&group->list_mutex);
2059 /* search for the subscriber */
2060 subs.num_subs = group->count;
2061 i = 0;
2062 result = -ENOENT;
2063 list_for_each(p, &group->list_head) {
2064 if (i++ == subs.index) {
2065 /* found! */
2066 struct snd_seq_subscribers *s;
2067 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2068 s = list_entry(p, struct snd_seq_subscribers, src_list);
2069 subs.addr = s->info.dest;
2070 } else {
2071 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2072 subs.addr = s->info.sender;
2073 }
2074 subs.flags = s->info.flags;
2075 subs.queue = s->info.queue;
2076 result = 0;
2077 break;
2078 }
2079 }
2080 up_read(&group->list_mutex);
2081
2082 __end:
2083 if (port)
2084 snd_seq_port_unlock(port);
2085 if (cptr)
2086 snd_seq_client_unlock(cptr);
2087 if (result >= 0) {
2088 if (copy_to_user(arg, &subs, sizeof(subs)))
2089 return -EFAULT;
2090 }
2091 return result;
2092 }
2093
2094
2095 /*
2096 * query next client
2097 */
snd_seq_ioctl_query_next_client(struct snd_seq_client * client,void __user * arg)2098 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2099 void __user *arg)
2100 {
2101 struct snd_seq_client *cptr = NULL;
2102 struct snd_seq_client_info info;
2103
2104 if (copy_from_user(&info, arg, sizeof(info)))
2105 return -EFAULT;
2106
2107 /* search for next client */
2108 info.client++;
2109 if (info.client < 0)
2110 info.client = 0;
2111 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2112 cptr = snd_seq_client_use_ptr(info.client);
2113 if (cptr)
2114 break; /* found */
2115 }
2116 if (cptr == NULL)
2117 return -ENOENT;
2118
2119 get_client_info(cptr, &info);
2120 snd_seq_client_unlock(cptr);
2121
2122 if (copy_to_user(arg, &info, sizeof(info)))
2123 return -EFAULT;
2124 return 0;
2125 }
2126
2127 /*
2128 * query next port
2129 */
snd_seq_ioctl_query_next_port(struct snd_seq_client * client,void __user * arg)2130 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2131 void __user *arg)
2132 {
2133 struct snd_seq_client *cptr;
2134 struct snd_seq_client_port *port = NULL;
2135 struct snd_seq_port_info info;
2136
2137 if (copy_from_user(&info, arg, sizeof(info)))
2138 return -EFAULT;
2139 cptr = snd_seq_client_use_ptr(info.addr.client);
2140 if (cptr == NULL)
2141 return -ENXIO;
2142
2143 /* search for next port */
2144 info.addr.port++;
2145 port = snd_seq_port_query_nearest(cptr, &info);
2146 if (port == NULL) {
2147 snd_seq_client_unlock(cptr);
2148 return -ENOENT;
2149 }
2150
2151 /* get port info */
2152 info.addr = port->addr;
2153 snd_seq_get_port_info(port, &info);
2154 snd_seq_port_unlock(port);
2155 snd_seq_client_unlock(cptr);
2156
2157 if (copy_to_user(arg, &info, sizeof(info)))
2158 return -EFAULT;
2159 return 0;
2160 }
2161
2162 /* -------------------------------------------------------- */
2163
2164 static struct seq_ioctl_table {
2165 unsigned int cmd;
2166 int (*func)(struct snd_seq_client *client, void __user * arg);
2167 } ioctl_tables[] = {
2168 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2169 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2170 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2171 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2172 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2173 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2174 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2175 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2176 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2177 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2178 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2179 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2180 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2181 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2182 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2183 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2184 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2185 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2186 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2187 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2188 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2189 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2190 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2191 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2192 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2193 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2194 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2195 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2196 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2197 { 0, NULL },
2198 };
2199
snd_seq_do_ioctl(struct snd_seq_client * client,unsigned int cmd,void __user * arg)2200 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2201 void __user *arg)
2202 {
2203 struct seq_ioctl_table *p;
2204 int ret;
2205
2206 switch (cmd) {
2207 case SNDRV_SEQ_IOCTL_PVERSION:
2208 /* return sequencer version number */
2209 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2210 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2211 /* return the id of this client */
2212 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2213 }
2214
2215 if (! arg)
2216 return -EFAULT;
2217 for (p = ioctl_tables; p->cmd; p++) {
2218 if (p->cmd == cmd) {
2219 mutex_lock(&client->ioctl_mutex);
2220 ret = p->func(client, arg);
2221 mutex_unlock(&client->ioctl_mutex);
2222 return ret;
2223 }
2224 }
2225 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2226 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2227 return -ENOTTY;
2228 }
2229
2230
snd_seq_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2231 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2232 {
2233 struct snd_seq_client *client = file->private_data;
2234
2235 if (snd_BUG_ON(!client))
2236 return -ENXIO;
2237
2238 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2239 }
2240
2241 #ifdef CONFIG_COMPAT
2242 #include "seq_compat.c"
2243 #else
2244 #define snd_seq_ioctl_compat NULL
2245 #endif
2246
2247 /* -------------------------------------------------------- */
2248
2249
2250 /* exported to kernel modules */
snd_seq_create_kernel_client(struct snd_card * card,int client_index,const char * name_fmt,...)2251 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2252 const char *name_fmt, ...)
2253 {
2254 struct snd_seq_client *client;
2255 va_list args;
2256
2257 if (snd_BUG_ON(in_interrupt()))
2258 return -EBUSY;
2259
2260 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2261 return -EINVAL;
2262 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2263 return -EINVAL;
2264
2265 if (mutex_lock_interruptible(®ister_mutex))
2266 return -ERESTARTSYS;
2267
2268 if (card) {
2269 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2270 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2271 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2272 client_index = -1;
2273 }
2274
2275 /* empty write queue as default */
2276 client = seq_create_client1(client_index, 0);
2277 if (client == NULL) {
2278 mutex_unlock(®ister_mutex);
2279 return -EBUSY; /* failure code */
2280 }
2281 usage_alloc(&client_usage, 1);
2282
2283 client->accept_input = 1;
2284 client->accept_output = 1;
2285
2286 va_start(args, name_fmt);
2287 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2288 va_end(args);
2289
2290 client->type = KERNEL_CLIENT;
2291 mutex_unlock(®ister_mutex);
2292
2293 /* make others aware this new client */
2294 snd_seq_system_client_ev_client_start(client->number);
2295
2296 /* return client number to caller */
2297 return client->number;
2298 }
2299
2300 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2301
2302 /* exported to kernel modules */
snd_seq_delete_kernel_client(int client)2303 int snd_seq_delete_kernel_client(int client)
2304 {
2305 struct snd_seq_client *ptr;
2306
2307 if (snd_BUG_ON(in_interrupt()))
2308 return -EBUSY;
2309
2310 ptr = clientptr(client);
2311 if (ptr == NULL)
2312 return -EINVAL;
2313
2314 seq_free_client(ptr);
2315 kfree(ptr);
2316 return 0;
2317 }
2318
2319 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2320
2321 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2322 * and snd_seq_kernel_client_enqueue_blocking
2323 */
kernel_client_enqueue(int client,struct snd_seq_event * ev,struct file * file,int blocking,int atomic,int hop)2324 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2325 struct file *file, int blocking,
2326 int atomic, int hop)
2327 {
2328 struct snd_seq_client *cptr;
2329 int result;
2330
2331 if (snd_BUG_ON(!ev))
2332 return -EINVAL;
2333
2334 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2335 return 0; /* ignore this */
2336 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2337 return -EINVAL; /* quoted events can't be enqueued */
2338
2339 /* fill in client number */
2340 ev->source.client = client;
2341
2342 if (check_event_type_and_length(ev))
2343 return -EINVAL;
2344
2345 cptr = snd_seq_client_use_ptr(client);
2346 if (cptr == NULL)
2347 return -EINVAL;
2348
2349 if (! cptr->accept_output)
2350 result = -EPERM;
2351 else /* send it */
2352 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2353
2354 snd_seq_client_unlock(cptr);
2355 return result;
2356 }
2357
2358 /*
2359 * exported, called by kernel clients to enqueue events (w/o blocking)
2360 *
2361 * RETURN VALUE: zero if succeed, negative if error
2362 */
snd_seq_kernel_client_enqueue(int client,struct snd_seq_event * ev,int atomic,int hop)2363 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2364 int atomic, int hop)
2365 {
2366 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2367 }
2368
2369 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2370
2371 /*
2372 * exported, called by kernel clients to enqueue events (with blocking)
2373 *
2374 * RETURN VALUE: zero if succeed, negative if error
2375 */
snd_seq_kernel_client_enqueue_blocking(int client,struct snd_seq_event * ev,struct file * file,int atomic,int hop)2376 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2377 struct file *file,
2378 int atomic, int hop)
2379 {
2380 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2381 }
2382
2383 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2384
2385 /*
2386 * exported, called by kernel clients to dispatch events directly to other
2387 * clients, bypassing the queues. Event time-stamp will be updated.
2388 *
2389 * RETURN VALUE: negative = delivery failed,
2390 * zero, or positive: the number of delivered events
2391 */
snd_seq_kernel_client_dispatch(int client,struct snd_seq_event * ev,int atomic,int hop)2392 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2393 int atomic, int hop)
2394 {
2395 struct snd_seq_client *cptr;
2396 int result;
2397
2398 if (snd_BUG_ON(!ev))
2399 return -EINVAL;
2400
2401 /* fill in client number */
2402 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2403 ev->source.client = client;
2404
2405 if (check_event_type_and_length(ev))
2406 return -EINVAL;
2407
2408 cptr = snd_seq_client_use_ptr(client);
2409 if (cptr == NULL)
2410 return -EINVAL;
2411
2412 if (!cptr->accept_output)
2413 result = -EPERM;
2414 else
2415 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2416
2417 snd_seq_client_unlock(cptr);
2418 return result;
2419 }
2420
2421 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2422
2423 /*
2424 * exported, called by kernel clients to perform same functions as with
2425 * userland ioctl()
2426 */
snd_seq_kernel_client_ctl(int clientid,unsigned int cmd,void * arg)2427 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2428 {
2429 struct snd_seq_client *client;
2430 mm_segment_t fs;
2431 int result;
2432
2433 client = clientptr(clientid);
2434 if (client == NULL)
2435 return -ENXIO;
2436 fs = snd_enter_user();
2437 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2438 snd_leave_user(fs);
2439 return result;
2440 }
2441
2442 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2443
2444 /* exported (for OSS emulator) */
snd_seq_kernel_client_write_poll(int clientid,struct file * file,poll_table * wait)2445 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2446 {
2447 struct snd_seq_client *client;
2448
2449 client = clientptr(clientid);
2450 if (client == NULL)
2451 return -ENXIO;
2452
2453 if (! snd_seq_write_pool_allocated(client))
2454 return 1;
2455 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2456 return 1;
2457 return 0;
2458 }
2459
2460 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2461
2462 /*---------------------------------------------------------------------------*/
2463
2464 #ifdef CONFIG_PROC_FS
2465 /*
2466 * /proc interface
2467 */
snd_seq_info_dump_subscribers(struct snd_info_buffer * buffer,struct snd_seq_port_subs_info * group,int is_src,char * msg)2468 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2469 struct snd_seq_port_subs_info *group,
2470 int is_src, char *msg)
2471 {
2472 struct list_head *p;
2473 struct snd_seq_subscribers *s;
2474 int count = 0;
2475
2476 down_read(&group->list_mutex);
2477 if (list_empty(&group->list_head)) {
2478 up_read(&group->list_mutex);
2479 return;
2480 }
2481 snd_iprintf(buffer, msg);
2482 list_for_each(p, &group->list_head) {
2483 if (is_src)
2484 s = list_entry(p, struct snd_seq_subscribers, src_list);
2485 else
2486 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2487 if (count++)
2488 snd_iprintf(buffer, ", ");
2489 snd_iprintf(buffer, "%d:%d",
2490 is_src ? s->info.dest.client : s->info.sender.client,
2491 is_src ? s->info.dest.port : s->info.sender.port);
2492 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2493 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2494 if (group->exclusive)
2495 snd_iprintf(buffer, "[ex]");
2496 }
2497 up_read(&group->list_mutex);
2498 snd_iprintf(buffer, "\n");
2499 }
2500
2501 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2502 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2503 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2504
2505 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2506
snd_seq_info_dump_ports(struct snd_info_buffer * buffer,struct snd_seq_client * client)2507 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2508 struct snd_seq_client *client)
2509 {
2510 struct snd_seq_client_port *p;
2511
2512 mutex_lock(&client->ports_mutex);
2513 list_for_each_entry(p, &client->ports_list_head, list) {
2514 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2515 p->addr.port, p->name,
2516 FLAG_PERM_RD(p->capability),
2517 FLAG_PERM_WR(p->capability),
2518 FLAG_PERM_EX(p->capability),
2519 FLAG_PERM_DUPLEX(p->capability));
2520 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2521 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2522 }
2523 mutex_unlock(&client->ports_mutex);
2524 }
2525
2526
2527 /* exported to seq_info.c */
snd_seq_info_clients_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2528 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2529 struct snd_info_buffer *buffer)
2530 {
2531 int c;
2532 struct snd_seq_client *client;
2533
2534 snd_iprintf(buffer, "Client info\n");
2535 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2536 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2537 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2538 snd_iprintf(buffer, "\n");
2539
2540 /* list the client table */
2541 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2542 client = snd_seq_client_use_ptr(c);
2543 if (client == NULL)
2544 continue;
2545 if (client->type == NO_CLIENT) {
2546 snd_seq_client_unlock(client);
2547 continue;
2548 }
2549
2550 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2551 c, client->name,
2552 client->type == USER_CLIENT ? "User" : "Kernel");
2553 snd_seq_info_dump_ports(buffer, client);
2554 if (snd_seq_write_pool_allocated(client)) {
2555 snd_iprintf(buffer, " Output pool :\n");
2556 snd_seq_info_pool(buffer, client->pool, " ");
2557 }
2558 if (client->type == USER_CLIENT && client->data.user.fifo &&
2559 client->data.user.fifo->pool) {
2560 snd_iprintf(buffer, " Input pool :\n");
2561 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2562 }
2563 snd_seq_client_unlock(client);
2564 }
2565 }
2566 #endif /* CONFIG_PROC_FS */
2567
2568 /*---------------------------------------------------------------------------*/
2569
2570
2571 /*
2572 * REGISTRATION PART
2573 */
2574
2575 static const struct file_operations snd_seq_f_ops =
2576 {
2577 .owner = THIS_MODULE,
2578 .read = snd_seq_read,
2579 .write = snd_seq_write,
2580 .open = snd_seq_open,
2581 .release = snd_seq_release,
2582 .llseek = no_llseek,
2583 .poll = snd_seq_poll,
2584 .unlocked_ioctl = snd_seq_ioctl,
2585 .compat_ioctl = snd_seq_ioctl_compat,
2586 };
2587
2588 /*
2589 * register sequencer device
2590 */
snd_sequencer_device_init(void)2591 int __init snd_sequencer_device_init(void)
2592 {
2593 int err;
2594
2595 if (mutex_lock_interruptible(®ister_mutex))
2596 return -ERESTARTSYS;
2597
2598 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2599 &snd_seq_f_ops, NULL, "seq")) < 0) {
2600 mutex_unlock(®ister_mutex);
2601 return err;
2602 }
2603
2604 mutex_unlock(®ister_mutex);
2605
2606 return 0;
2607 }
2608
2609
2610
2611 /*
2612 * unregister sequencer device
2613 */
snd_sequencer_device_done(void)2614 void __exit snd_sequencer_device_done(void)
2615 {
2616 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2617 }
2618