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 spin_lock_irqsave(&clients_lock, flags);
274 clienttablock[client->number] = 1;
275 clienttab[client->number] = NULL;
276 spin_unlock_irqrestore(&clients_lock, flags);
277 snd_seq_delete_all_ports(client);
278 snd_seq_queue_client_leave(client->number);
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, true);
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,struct mutex * mutexp)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 struct mutex *mutexp)
924 {
925 struct snd_seq_event_cell *cell;
926 int err;
927
928 /* special queue values - force direct passing */
929 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
931 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
932 } else
933 #ifdef SUPPORT_BROADCAST
934 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
935 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
936 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
937 }
938 #endif
939 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
940 /* check presence of source port */
941 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
942 if (src_port == NULL)
943 return -EINVAL;
944 snd_seq_port_unlock(src_port);
945 }
946
947 /* direct event processing without enqueued */
948 if (snd_seq_ev_is_direct(event)) {
949 if (event->type == SNDRV_SEQ_EVENT_NOTE)
950 return -EINVAL; /* this event must be enqueued! */
951 return snd_seq_deliver_event(client, event, atomic, hop);
952 }
953
954 /* Not direct, normal queuing */
955 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
956 return -EINVAL; /* invalid queue */
957 if (! snd_seq_write_pool_allocated(client))
958 return -ENXIO; /* queue is not allocated */
959
960 /* allocate an event cell */
961 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
962 file, mutexp);
963 if (err < 0)
964 return err;
965
966 /* we got a cell. enqueue it. */
967 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
968 snd_seq_cell_free(cell);
969 return err;
970 }
971
972 return 0;
973 }
974
975
976 /*
977 * check validity of event type and data length.
978 * return non-zero if invalid.
979 */
check_event_type_and_length(struct snd_seq_event * ev)980 static int check_event_type_and_length(struct snd_seq_event *ev)
981 {
982 switch (snd_seq_ev_length_type(ev)) {
983 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
984 if (snd_seq_ev_is_variable_type(ev))
985 return -EINVAL;
986 break;
987 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
988 if (! snd_seq_ev_is_variable_type(ev) ||
989 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
990 return -EINVAL;
991 break;
992 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
993 if (! snd_seq_ev_is_direct(ev))
994 return -EINVAL;
995 break;
996 }
997 return 0;
998 }
999
1000
1001 /* handle write() */
1002 /* possible error values:
1003 * -ENXIO invalid client or file open mode
1004 * -ENOMEM malloc failed
1005 * -EFAULT seg. fault during copy from user space
1006 * -EINVAL invalid event
1007 * -EAGAIN no space in output pool
1008 * -EINTR interrupts while sleep
1009 * -EMLINK too many hops
1010 * others depends on return value from driver callback
1011 */
snd_seq_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)1012 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1013 size_t count, loff_t *offset)
1014 {
1015 struct snd_seq_client *client = file->private_data;
1016 int written = 0, len;
1017 int err, handled;
1018 struct snd_seq_event event;
1019
1020 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1021 return -ENXIO;
1022
1023 /* check client structures are in place */
1024 if (snd_BUG_ON(!client))
1025 return -ENXIO;
1026
1027 if (!client->accept_output || client->pool == NULL)
1028 return -ENXIO;
1029
1030 repeat:
1031 handled = 0;
1032 /* allocate the pool now if the pool is not allocated yet */
1033 mutex_lock(&client->ioctl_mutex);
1034 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1035 err = snd_seq_pool_init(client->pool);
1036 if (err < 0)
1037 goto out;
1038 }
1039
1040 /* only process whole events */
1041 err = -EINVAL;
1042 while (count >= sizeof(struct snd_seq_event)) {
1043 /* Read in the event header from the user */
1044 len = sizeof(event);
1045 if (copy_from_user(&event, buf, len)) {
1046 err = -EFAULT;
1047 break;
1048 }
1049 event.source.client = client->number; /* fill in client number */
1050 /* Check for extension data length */
1051 if (check_event_type_and_length(&event)) {
1052 err = -EINVAL;
1053 break;
1054 }
1055
1056 /* check for special events */
1057 if (event.type == SNDRV_SEQ_EVENT_NONE)
1058 goto __skip_event;
1059 else if (snd_seq_ev_is_reserved(&event)) {
1060 err = -EINVAL;
1061 break;
1062 }
1063
1064 if (snd_seq_ev_is_variable(&event)) {
1065 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1066 if ((size_t)(extlen + len) > count) {
1067 /* back out, will get an error this time or next */
1068 err = -EINVAL;
1069 break;
1070 }
1071 /* set user space pointer */
1072 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1073 event.data.ext.ptr = (char __force *)buf
1074 + sizeof(struct snd_seq_event);
1075 len += extlen; /* increment data length */
1076 } else {
1077 #ifdef CONFIG_COMPAT
1078 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1079 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1080 event.data.ext.ptr = ptr;
1081 }
1082 #endif
1083 }
1084
1085 /* ok, enqueue it */
1086 err = snd_seq_client_enqueue_event(client, &event, file,
1087 !(file->f_flags & O_NONBLOCK),
1088 0, 0, &client->ioctl_mutex);
1089 if (err < 0)
1090 break;
1091 handled++;
1092
1093 __skip_event:
1094 /* Update pointers and counts */
1095 count -= len;
1096 buf += len;
1097 written += len;
1098
1099 /* let's have a coffee break if too many events are queued */
1100 if (++handled >= 200) {
1101 mutex_unlock(&client->ioctl_mutex);
1102 goto repeat;
1103 }
1104 }
1105
1106 out:
1107 mutex_unlock(&client->ioctl_mutex);
1108 return written ? written : err;
1109 }
1110
1111
1112 /*
1113 * handle polling
1114 */
snd_seq_poll(struct file * file,poll_table * wait)1115 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1116 {
1117 struct snd_seq_client *client = file->private_data;
1118 unsigned int mask = 0;
1119
1120 /* check client structures are in place */
1121 if (snd_BUG_ON(!client))
1122 return -ENXIO;
1123
1124 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1125 client->data.user.fifo) {
1126
1127 /* check if data is available in the outqueue */
1128 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1129 mask |= POLLIN | POLLRDNORM;
1130 }
1131
1132 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1133
1134 /* check if data is available in the pool */
1135 if (!snd_seq_write_pool_allocated(client) ||
1136 snd_seq_pool_poll_wait(client->pool, file, wait))
1137 mask |= POLLOUT | POLLWRNORM;
1138 }
1139
1140 return mask;
1141 }
1142
1143
1144 /*-----------------------------------------------------*/
1145
1146
1147 /* SYSTEM_INFO ioctl() */
snd_seq_ioctl_system_info(struct snd_seq_client * client,void __user * arg)1148 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1149 {
1150 struct snd_seq_system_info info;
1151
1152 memset(&info, 0, sizeof(info));
1153 /* fill the info fields */
1154 info.queues = SNDRV_SEQ_MAX_QUEUES;
1155 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1156 info.ports = SNDRV_SEQ_MAX_PORTS;
1157 info.channels = 256; /* fixed limit */
1158 info.cur_clients = client_usage.cur;
1159 info.cur_queues = snd_seq_queue_get_cur_queues();
1160
1161 if (copy_to_user(arg, &info, sizeof(info)))
1162 return -EFAULT;
1163 return 0;
1164 }
1165
1166
1167 /* RUNNING_MODE ioctl() */
snd_seq_ioctl_running_mode(struct snd_seq_client * client,void __user * arg)1168 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1169 {
1170 struct snd_seq_running_info info;
1171 struct snd_seq_client *cptr;
1172 int err = 0;
1173
1174 if (copy_from_user(&info, arg, sizeof(info)))
1175 return -EFAULT;
1176
1177 /* requested client number */
1178 cptr = snd_seq_client_use_ptr(info.client);
1179 if (cptr == NULL)
1180 return -ENOENT; /* don't change !!! */
1181
1182 #ifdef SNDRV_BIG_ENDIAN
1183 if (! info.big_endian) {
1184 err = -EINVAL;
1185 goto __err;
1186 }
1187 #else
1188 if (info.big_endian) {
1189 err = -EINVAL;
1190 goto __err;
1191 }
1192
1193 #endif
1194 if (info.cpu_mode > sizeof(long)) {
1195 err = -EINVAL;
1196 goto __err;
1197 }
1198 cptr->convert32 = (info.cpu_mode < sizeof(long));
1199 __err:
1200 snd_seq_client_unlock(cptr);
1201 return err;
1202 }
1203
1204 /* CLIENT_INFO ioctl() */
get_client_info(struct snd_seq_client * cptr,struct snd_seq_client_info * info)1205 static void get_client_info(struct snd_seq_client *cptr,
1206 struct snd_seq_client_info *info)
1207 {
1208 info->client = cptr->number;
1209
1210 /* fill the info fields */
1211 info->type = cptr->type;
1212 strcpy(info->name, cptr->name);
1213 info->filter = cptr->filter;
1214 info->event_lost = cptr->event_lost;
1215 memcpy(info->event_filter, cptr->event_filter, 32);
1216 info->num_ports = cptr->num_ports;
1217 memset(info->reserved, 0, sizeof(info->reserved));
1218 }
1219
snd_seq_ioctl_get_client_info(struct snd_seq_client * client,void __user * arg)1220 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1221 void __user *arg)
1222 {
1223 struct snd_seq_client *cptr;
1224 struct snd_seq_client_info client_info;
1225
1226 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1227 return -EFAULT;
1228
1229 /* requested client number */
1230 cptr = snd_seq_client_use_ptr(client_info.client);
1231 if (cptr == NULL)
1232 return -ENOENT; /* don't change !!! */
1233
1234 get_client_info(cptr, &client_info);
1235 snd_seq_client_unlock(cptr);
1236
1237 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1238 return -EFAULT;
1239 return 0;
1240 }
1241
1242
1243 /* CLIENT_INFO ioctl() */
snd_seq_ioctl_set_client_info(struct snd_seq_client * client,void __user * arg)1244 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1245 void __user *arg)
1246 {
1247 struct snd_seq_client_info client_info;
1248
1249 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1250 return -EFAULT;
1251
1252 /* it is not allowed to set the info fields for an another client */
1253 if (client->number != client_info.client)
1254 return -EPERM;
1255 /* also client type must be set now */
1256 if (client->type != client_info.type)
1257 return -EINVAL;
1258
1259 /* fill the info fields */
1260 if (client_info.name[0])
1261 strscpy(client->name, client_info.name, sizeof(client->name));
1262
1263 client->filter = client_info.filter;
1264 client->event_lost = client_info.event_lost;
1265 memcpy(client->event_filter, client_info.event_filter, 32);
1266
1267 return 0;
1268 }
1269
1270
1271 /*
1272 * CREATE PORT ioctl()
1273 */
snd_seq_ioctl_create_port(struct snd_seq_client * client,void __user * arg)1274 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1275 void __user *arg)
1276 {
1277 struct snd_seq_client_port *port;
1278 struct snd_seq_port_info info;
1279 struct snd_seq_port_callback *callback;
1280 int port_idx;
1281
1282 if (copy_from_user(&info, arg, sizeof(info)))
1283 return -EFAULT;
1284
1285 /* it is not allowed to create the port for an another client */
1286 if (info.addr.client != client->number)
1287 return -EPERM;
1288
1289 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1290 if (port == NULL)
1291 return -ENOMEM;
1292
1293 if (client->type == USER_CLIENT && info.kernel) {
1294 port_idx = port->addr.port;
1295 snd_seq_port_unlock(port);
1296 snd_seq_delete_port(client, port_idx);
1297 return -EINVAL;
1298 }
1299 if (client->type == KERNEL_CLIENT) {
1300 if ((callback = info.kernel) != NULL) {
1301 if (callback->owner)
1302 port->owner = callback->owner;
1303 port->private_data = callback->private_data;
1304 port->private_free = callback->private_free;
1305 port->event_input = callback->event_input;
1306 port->c_src.open = callback->subscribe;
1307 port->c_src.close = callback->unsubscribe;
1308 port->c_dest.open = callback->use;
1309 port->c_dest.close = callback->unuse;
1310 }
1311 }
1312
1313 info.addr = port->addr;
1314
1315 snd_seq_set_port_info(port, &info);
1316 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1317 snd_seq_port_unlock(port);
1318
1319 if (copy_to_user(arg, &info, sizeof(info)))
1320 return -EFAULT;
1321
1322 return 0;
1323 }
1324
1325 /*
1326 * DELETE PORT ioctl()
1327 */
snd_seq_ioctl_delete_port(struct snd_seq_client * client,void __user * arg)1328 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1329 void __user *arg)
1330 {
1331 struct snd_seq_port_info info;
1332 int err;
1333
1334 /* set passed parameters */
1335 if (copy_from_user(&info, arg, sizeof(info)))
1336 return -EFAULT;
1337
1338 /* it is not allowed to remove the port for an another client */
1339 if (info.addr.client != client->number)
1340 return -EPERM;
1341
1342 err = snd_seq_delete_port(client, info.addr.port);
1343 if (err >= 0)
1344 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1345 return err;
1346 }
1347
1348
1349 /*
1350 * GET_PORT_INFO ioctl() (on any client)
1351 */
snd_seq_ioctl_get_port_info(struct snd_seq_client * client,void __user * arg)1352 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1353 void __user *arg)
1354 {
1355 struct snd_seq_client *cptr;
1356 struct snd_seq_client_port *port;
1357 struct snd_seq_port_info info;
1358
1359 if (copy_from_user(&info, arg, sizeof(info)))
1360 return -EFAULT;
1361 cptr = snd_seq_client_use_ptr(info.addr.client);
1362 if (cptr == NULL)
1363 return -ENXIO;
1364
1365 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1366 if (port == NULL) {
1367 snd_seq_client_unlock(cptr);
1368 return -ENOENT; /* don't change */
1369 }
1370
1371 /* get port info */
1372 snd_seq_get_port_info(port, &info);
1373 snd_seq_port_unlock(port);
1374 snd_seq_client_unlock(cptr);
1375
1376 if (copy_to_user(arg, &info, sizeof(info)))
1377 return -EFAULT;
1378 return 0;
1379 }
1380
1381
1382 /*
1383 * SET_PORT_INFO ioctl() (only ports on this/own client)
1384 */
snd_seq_ioctl_set_port_info(struct snd_seq_client * client,void __user * arg)1385 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1386 void __user *arg)
1387 {
1388 struct snd_seq_client_port *port;
1389 struct snd_seq_port_info info;
1390
1391 if (copy_from_user(&info, arg, sizeof(info)))
1392 return -EFAULT;
1393
1394 if (info.addr.client != client->number) /* only set our own ports ! */
1395 return -EPERM;
1396 port = snd_seq_port_use_ptr(client, info.addr.port);
1397 if (port) {
1398 snd_seq_set_port_info(port, &info);
1399 snd_seq_port_unlock(port);
1400 }
1401 return 0;
1402 }
1403
1404
1405 /*
1406 * port subscription (connection)
1407 */
1408 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1409 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1410
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)1411 static int check_subscription_permission(struct snd_seq_client *client,
1412 struct snd_seq_client_port *sport,
1413 struct snd_seq_client_port *dport,
1414 struct snd_seq_port_subscribe *subs)
1415 {
1416 if (client->number != subs->sender.client &&
1417 client->number != subs->dest.client) {
1418 /* connection by third client - check export permission */
1419 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1420 return -EPERM;
1421 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1422 return -EPERM;
1423 }
1424
1425 /* check read permission */
1426 /* if sender or receiver is the subscribing client itself,
1427 * no permission check is necessary
1428 */
1429 if (client->number != subs->sender.client) {
1430 if (! check_port_perm(sport, PERM_RD))
1431 return -EPERM;
1432 }
1433 /* check write permission */
1434 if (client->number != subs->dest.client) {
1435 if (! check_port_perm(dport, PERM_WR))
1436 return -EPERM;
1437 }
1438 return 0;
1439 }
1440
1441 /*
1442 * send an subscription notify event to user client:
1443 * client must be user client.
1444 */
snd_seq_client_notify_subscription(int client,int port,struct snd_seq_port_subscribe * info,int evtype)1445 int snd_seq_client_notify_subscription(int client, int port,
1446 struct snd_seq_port_subscribe *info,
1447 int evtype)
1448 {
1449 struct snd_seq_event event;
1450
1451 memset(&event, 0, sizeof(event));
1452 event.type = evtype;
1453 event.data.connect.dest = info->dest;
1454 event.data.connect.sender = info->sender;
1455
1456 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1457 }
1458
1459
1460 /*
1461 * add to port's subscription list IOCTL interface
1462 */
snd_seq_ioctl_subscribe_port(struct snd_seq_client * client,void __user * arg)1463 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1464 void __user *arg)
1465 {
1466 int result = -EINVAL;
1467 struct snd_seq_client *receiver = NULL, *sender = NULL;
1468 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1469 struct snd_seq_port_subscribe subs;
1470
1471 if (copy_from_user(&subs, arg, sizeof(subs)))
1472 return -EFAULT;
1473
1474 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1475 goto __end;
1476 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1477 goto __end;
1478 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1479 goto __end;
1480 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1481 goto __end;
1482
1483 result = check_subscription_permission(client, sport, dport, &subs);
1484 if (result < 0)
1485 goto __end;
1486
1487 /* connect them */
1488 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1489 if (! result) /* broadcast announce */
1490 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1491 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1492 __end:
1493 if (sport)
1494 snd_seq_port_unlock(sport);
1495 if (dport)
1496 snd_seq_port_unlock(dport);
1497 if (sender)
1498 snd_seq_client_unlock(sender);
1499 if (receiver)
1500 snd_seq_client_unlock(receiver);
1501 return result;
1502 }
1503
1504
1505 /*
1506 * remove from port's subscription list
1507 */
snd_seq_ioctl_unsubscribe_port(struct snd_seq_client * client,void __user * arg)1508 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1509 void __user *arg)
1510 {
1511 int result = -ENXIO;
1512 struct snd_seq_client *receiver = NULL, *sender = NULL;
1513 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1514 struct snd_seq_port_subscribe subs;
1515
1516 if (copy_from_user(&subs, arg, sizeof(subs)))
1517 return -EFAULT;
1518
1519 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1520 goto __end;
1521 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1522 goto __end;
1523 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1524 goto __end;
1525 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1526 goto __end;
1527
1528 result = check_subscription_permission(client, sport, dport, &subs);
1529 if (result < 0)
1530 goto __end;
1531
1532 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1533 if (! result) /* broadcast announce */
1534 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1535 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1536 __end:
1537 if (sport)
1538 snd_seq_port_unlock(sport);
1539 if (dport)
1540 snd_seq_port_unlock(dport);
1541 if (sender)
1542 snd_seq_client_unlock(sender);
1543 if (receiver)
1544 snd_seq_client_unlock(receiver);
1545 return result;
1546 }
1547
1548
1549 /* CREATE_QUEUE ioctl() */
snd_seq_ioctl_create_queue(struct snd_seq_client * client,void __user * arg)1550 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1551 void __user *arg)
1552 {
1553 struct snd_seq_queue_info info;
1554 struct snd_seq_queue *q;
1555
1556 if (copy_from_user(&info, arg, sizeof(info)))
1557 return -EFAULT;
1558
1559 q = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1560 if (IS_ERR(q))
1561 return PTR_ERR(q);
1562
1563 info.queue = q->queue;
1564 info.locked = q->locked;
1565 info.owner = q->owner;
1566
1567 /* set queue name */
1568 if (! info.name[0])
1569 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1570 strscpy(q->name, info.name, sizeof(q->name));
1571 snd_use_lock_free(&q->use_lock);
1572
1573 if (copy_to_user(arg, &info, sizeof(info)))
1574 return -EFAULT;
1575
1576 return 0;
1577 }
1578
1579 /* DELETE_QUEUE ioctl() */
snd_seq_ioctl_delete_queue(struct snd_seq_client * client,void __user * arg)1580 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1581 void __user *arg)
1582 {
1583 struct snd_seq_queue_info info;
1584
1585 if (copy_from_user(&info, arg, sizeof(info)))
1586 return -EFAULT;
1587
1588 return snd_seq_queue_delete(client->number, info.queue);
1589 }
1590
1591 /* GET_QUEUE_INFO ioctl() */
snd_seq_ioctl_get_queue_info(struct snd_seq_client * client,void __user * arg)1592 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1593 void __user *arg)
1594 {
1595 struct snd_seq_queue_info info;
1596 struct snd_seq_queue *q;
1597
1598 if (copy_from_user(&info, arg, sizeof(info)))
1599 return -EFAULT;
1600
1601 q = queueptr(info.queue);
1602 if (q == NULL)
1603 return -EINVAL;
1604
1605 memset(&info, 0, sizeof(info));
1606 info.queue = q->queue;
1607 info.owner = q->owner;
1608 info.locked = q->locked;
1609 strlcpy(info.name, q->name, sizeof(info.name));
1610 queuefree(q);
1611
1612 if (copy_to_user(arg, &info, sizeof(info)))
1613 return -EFAULT;
1614
1615 return 0;
1616 }
1617
1618 /* SET_QUEUE_INFO ioctl() */
snd_seq_ioctl_set_queue_info(struct snd_seq_client * client,void __user * arg)1619 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1620 void __user *arg)
1621 {
1622 struct snd_seq_queue_info info;
1623 struct snd_seq_queue *q;
1624
1625 if (copy_from_user(&info, arg, sizeof(info)))
1626 return -EFAULT;
1627
1628 if (info.owner != client->number)
1629 return -EINVAL;
1630
1631 /* change owner/locked permission */
1632 if (snd_seq_queue_check_access(info.queue, client->number)) {
1633 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1634 return -EPERM;
1635 if (info.locked)
1636 snd_seq_queue_use(info.queue, client->number, 1);
1637 } else {
1638 return -EPERM;
1639 }
1640
1641 q = queueptr(info.queue);
1642 if (! q)
1643 return -EINVAL;
1644 if (q->owner != client->number) {
1645 queuefree(q);
1646 return -EPERM;
1647 }
1648 strscpy(q->name, info.name, sizeof(q->name));
1649 queuefree(q);
1650
1651 return 0;
1652 }
1653
1654 /* GET_NAMED_QUEUE ioctl() */
snd_seq_ioctl_get_named_queue(struct snd_seq_client * client,void __user * arg)1655 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1656 {
1657 struct snd_seq_queue_info info;
1658 struct snd_seq_queue *q;
1659
1660 if (copy_from_user(&info, arg, sizeof(info)))
1661 return -EFAULT;
1662
1663 q = snd_seq_queue_find_name(info.name);
1664 if (q == NULL)
1665 return -EINVAL;
1666 info.queue = q->queue;
1667 info.owner = q->owner;
1668 info.locked = q->locked;
1669 queuefree(q);
1670
1671 if (copy_to_user(arg, &info, sizeof(info)))
1672 return -EFAULT;
1673
1674 return 0;
1675 }
1676
1677 /* GET_QUEUE_STATUS ioctl() */
snd_seq_ioctl_get_queue_status(struct snd_seq_client * client,void __user * arg)1678 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1679 void __user *arg)
1680 {
1681 struct snd_seq_queue_status status;
1682 struct snd_seq_queue *queue;
1683 struct snd_seq_timer *tmr;
1684
1685 if (copy_from_user(&status, arg, sizeof(status)))
1686 return -EFAULT;
1687
1688 queue = queueptr(status.queue);
1689 if (queue == NULL)
1690 return -EINVAL;
1691 memset(&status, 0, sizeof(status));
1692 status.queue = queue->queue;
1693
1694 tmr = queue->timer;
1695 status.events = queue->tickq->cells + queue->timeq->cells;
1696
1697 status.time = snd_seq_timer_get_cur_time(tmr, true);
1698 status.tick = snd_seq_timer_get_cur_tick(tmr);
1699
1700 status.running = tmr->running;
1701
1702 status.flags = queue->flags;
1703 queuefree(queue);
1704
1705 if (copy_to_user(arg, &status, sizeof(status)))
1706 return -EFAULT;
1707 return 0;
1708 }
1709
1710
1711 /* GET_QUEUE_TEMPO ioctl() */
snd_seq_ioctl_get_queue_tempo(struct snd_seq_client * client,void __user * arg)1712 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1713 void __user *arg)
1714 {
1715 struct snd_seq_queue_tempo tempo;
1716 struct snd_seq_queue *queue;
1717 struct snd_seq_timer *tmr;
1718
1719 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1720 return -EFAULT;
1721
1722 queue = queueptr(tempo.queue);
1723 if (queue == NULL)
1724 return -EINVAL;
1725 memset(&tempo, 0, sizeof(tempo));
1726 tempo.queue = queue->queue;
1727
1728 tmr = queue->timer;
1729
1730 tempo.tempo = tmr->tempo;
1731 tempo.ppq = tmr->ppq;
1732 tempo.skew_value = tmr->skew;
1733 tempo.skew_base = tmr->skew_base;
1734 queuefree(queue);
1735
1736 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1737 return -EFAULT;
1738 return 0;
1739 }
1740
1741
1742 /* SET_QUEUE_TEMPO ioctl() */
snd_seq_set_queue_tempo(int client,struct snd_seq_queue_tempo * tempo)1743 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1744 {
1745 if (!snd_seq_queue_check_access(tempo->queue, client))
1746 return -EPERM;
1747 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1748 }
1749
1750 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1751
snd_seq_ioctl_set_queue_tempo(struct snd_seq_client * client,void __user * arg)1752 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1753 void __user *arg)
1754 {
1755 int result;
1756 struct snd_seq_queue_tempo tempo;
1757
1758 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1759 return -EFAULT;
1760
1761 result = snd_seq_set_queue_tempo(client->number, &tempo);
1762 return result < 0 ? result : 0;
1763 }
1764
1765
1766 /* GET_QUEUE_TIMER ioctl() */
snd_seq_ioctl_get_queue_timer(struct snd_seq_client * client,void __user * arg)1767 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1768 void __user *arg)
1769 {
1770 struct snd_seq_queue_timer timer;
1771 struct snd_seq_queue *queue;
1772 struct snd_seq_timer *tmr;
1773
1774 if (copy_from_user(&timer, arg, sizeof(timer)))
1775 return -EFAULT;
1776
1777 queue = queueptr(timer.queue);
1778 if (queue == NULL)
1779 return -EINVAL;
1780
1781 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1782 queuefree(queue);
1783 return -ERESTARTSYS;
1784 }
1785 tmr = queue->timer;
1786 memset(&timer, 0, sizeof(timer));
1787 timer.queue = queue->queue;
1788
1789 timer.type = tmr->type;
1790 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1791 timer.u.alsa.id = tmr->alsa_id;
1792 timer.u.alsa.resolution = tmr->preferred_resolution;
1793 }
1794 mutex_unlock(&queue->timer_mutex);
1795 queuefree(queue);
1796
1797 if (copy_to_user(arg, &timer, sizeof(timer)))
1798 return -EFAULT;
1799 return 0;
1800 }
1801
1802
1803 /* SET_QUEUE_TIMER ioctl() */
snd_seq_ioctl_set_queue_timer(struct snd_seq_client * client,void __user * arg)1804 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1805 void __user *arg)
1806 {
1807 int result = 0;
1808 struct snd_seq_queue_timer timer;
1809
1810 if (copy_from_user(&timer, arg, sizeof(timer)))
1811 return -EFAULT;
1812
1813 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1814 return -EINVAL;
1815
1816 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1817 struct snd_seq_queue *q;
1818 struct snd_seq_timer *tmr;
1819
1820 q = queueptr(timer.queue);
1821 if (q == NULL)
1822 return -ENXIO;
1823 if (mutex_lock_interruptible(&q->timer_mutex)) {
1824 queuefree(q);
1825 return -ERESTARTSYS;
1826 }
1827 tmr = q->timer;
1828 snd_seq_queue_timer_close(timer.queue);
1829 tmr->type = timer.type;
1830 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1831 tmr->alsa_id = timer.u.alsa.id;
1832 tmr->preferred_resolution = timer.u.alsa.resolution;
1833 }
1834 result = snd_seq_queue_timer_open(timer.queue);
1835 mutex_unlock(&q->timer_mutex);
1836 queuefree(q);
1837 } else {
1838 return -EPERM;
1839 }
1840
1841 return result;
1842 }
1843
1844
1845 /* GET_QUEUE_CLIENT ioctl() */
snd_seq_ioctl_get_queue_client(struct snd_seq_client * client,void __user * arg)1846 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1847 void __user *arg)
1848 {
1849 struct snd_seq_queue_client info;
1850 int used;
1851
1852 if (copy_from_user(&info, arg, sizeof(info)))
1853 return -EFAULT;
1854
1855 used = snd_seq_queue_is_used(info.queue, client->number);
1856 if (used < 0)
1857 return -EINVAL;
1858 info.used = used;
1859 info.client = client->number;
1860
1861 if (copy_to_user(arg, &info, sizeof(info)))
1862 return -EFAULT;
1863 return 0;
1864 }
1865
1866
1867 /* SET_QUEUE_CLIENT ioctl() */
snd_seq_ioctl_set_queue_client(struct snd_seq_client * client,void __user * arg)1868 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1869 void __user *arg)
1870 {
1871 int err;
1872 struct snd_seq_queue_client info;
1873
1874 if (copy_from_user(&info, arg, sizeof(info)))
1875 return -EFAULT;
1876
1877 if (info.used >= 0) {
1878 err = snd_seq_queue_use(info.queue, client->number, info.used);
1879 if (err < 0)
1880 return err;
1881 }
1882
1883 return snd_seq_ioctl_get_queue_client(client, arg);
1884 }
1885
1886
1887 /* GET_CLIENT_POOL ioctl() */
snd_seq_ioctl_get_client_pool(struct snd_seq_client * client,void __user * arg)1888 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1889 void __user *arg)
1890 {
1891 struct snd_seq_client_pool info;
1892 struct snd_seq_client *cptr;
1893
1894 if (copy_from_user(&info, arg, sizeof(info)))
1895 return -EFAULT;
1896
1897 cptr = snd_seq_client_use_ptr(info.client);
1898 if (cptr == NULL)
1899 return -ENOENT;
1900 memset(&info, 0, sizeof(info));
1901 info.client = cptr->number;
1902 info.output_pool = cptr->pool->size;
1903 info.output_room = cptr->pool->room;
1904 info.output_free = info.output_pool;
1905 info.output_free = snd_seq_unused_cells(cptr->pool);
1906 if (cptr->type == USER_CLIENT) {
1907 info.input_pool = cptr->data.user.fifo_pool_size;
1908 info.input_free = info.input_pool;
1909 info.input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1910 } else {
1911 info.input_pool = 0;
1912 info.input_free = 0;
1913 }
1914 snd_seq_client_unlock(cptr);
1915
1916 if (copy_to_user(arg, &info, sizeof(info)))
1917 return -EFAULT;
1918 return 0;
1919 }
1920
1921 /* SET_CLIENT_POOL ioctl() */
snd_seq_ioctl_set_client_pool(struct snd_seq_client * client,void __user * arg)1922 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1923 void __user *arg)
1924 {
1925 struct snd_seq_client_pool info;
1926 int rc;
1927
1928 if (copy_from_user(&info, arg, sizeof(info)))
1929 return -EFAULT;
1930
1931 if (client->number != info.client)
1932 return -EINVAL; /* can't change other clients */
1933
1934 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1935 (! snd_seq_write_pool_allocated(client) ||
1936 info.output_pool != client->pool->size)) {
1937 if (snd_seq_write_pool_allocated(client)) {
1938 /* is the pool in use? */
1939 if (atomic_read(&client->pool->counter))
1940 return -EBUSY;
1941 /* remove all existing cells */
1942 snd_seq_pool_mark_closing(client->pool);
1943 snd_seq_queue_client_leave_cells(client->number);
1944 snd_seq_pool_done(client->pool);
1945 }
1946 client->pool->size = info.output_pool;
1947 rc = snd_seq_pool_init(client->pool);
1948 if (rc < 0)
1949 return rc;
1950 }
1951 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1952 info.input_pool >= 1 &&
1953 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1954 info.input_pool != client->data.user.fifo_pool_size) {
1955 /* change pool size */
1956 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1957 if (rc < 0)
1958 return rc;
1959 client->data.user.fifo_pool_size = info.input_pool;
1960 }
1961 if (info.output_room >= 1 &&
1962 info.output_room <= client->pool->size) {
1963 client->pool->room = info.output_room;
1964 }
1965
1966 return snd_seq_ioctl_get_client_pool(client, arg);
1967 }
1968
1969
1970 /* REMOVE_EVENTS ioctl() */
snd_seq_ioctl_remove_events(struct snd_seq_client * client,void __user * arg)1971 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1972 void __user *arg)
1973 {
1974 struct snd_seq_remove_events info;
1975
1976 if (copy_from_user(&info, arg, sizeof(info)))
1977 return -EFAULT;
1978
1979 /*
1980 * Input mostly not implemented XXX.
1981 */
1982 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1983 /*
1984 * No restrictions so for a user client we can clear
1985 * the whole fifo
1986 */
1987 if (client->type == USER_CLIENT && client->data.user.fifo)
1988 snd_seq_fifo_clear(client->data.user.fifo);
1989 }
1990
1991 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1992 snd_seq_queue_remove_cells(client->number, &info);
1993
1994 return 0;
1995 }
1996
1997
1998 /*
1999 * get subscription info
2000 */
snd_seq_ioctl_get_subscription(struct snd_seq_client * client,void __user * arg)2001 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
2002 void __user *arg)
2003 {
2004 int result;
2005 struct snd_seq_client *sender = NULL;
2006 struct snd_seq_client_port *sport = NULL;
2007 struct snd_seq_port_subscribe subs;
2008 struct snd_seq_subscribers *p;
2009
2010 if (copy_from_user(&subs, arg, sizeof(subs)))
2011 return -EFAULT;
2012
2013 result = -EINVAL;
2014 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
2015 goto __end;
2016 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
2017 goto __end;
2018 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2019 if (p) {
2020 result = 0;
2021 subs = p->info;
2022 } else
2023 result = -ENOENT;
2024
2025 __end:
2026 if (sport)
2027 snd_seq_port_unlock(sport);
2028 if (sender)
2029 snd_seq_client_unlock(sender);
2030 if (result >= 0) {
2031 if (copy_to_user(arg, &subs, sizeof(subs)))
2032 return -EFAULT;
2033 }
2034 return result;
2035 }
2036
2037
2038 /*
2039 * get subscription info - check only its presence
2040 */
snd_seq_ioctl_query_subs(struct snd_seq_client * client,void __user * arg)2041 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2042 void __user *arg)
2043 {
2044 int result = -ENXIO;
2045 struct snd_seq_client *cptr = NULL;
2046 struct snd_seq_client_port *port = NULL;
2047 struct snd_seq_query_subs subs;
2048 struct snd_seq_port_subs_info *group;
2049 struct list_head *p;
2050 int i;
2051
2052 if (copy_from_user(&subs, arg, sizeof(subs)))
2053 return -EFAULT;
2054
2055 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2056 goto __end;
2057 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2058 goto __end;
2059
2060 switch (subs.type) {
2061 case SNDRV_SEQ_QUERY_SUBS_READ:
2062 group = &port->c_src;
2063 break;
2064 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2065 group = &port->c_dest;
2066 break;
2067 default:
2068 goto __end;
2069 }
2070
2071 down_read(&group->list_mutex);
2072 /* search for the subscriber */
2073 subs.num_subs = group->count;
2074 i = 0;
2075 result = -ENOENT;
2076 list_for_each(p, &group->list_head) {
2077 if (i++ == subs.index) {
2078 /* found! */
2079 struct snd_seq_subscribers *s;
2080 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2081 s = list_entry(p, struct snd_seq_subscribers, src_list);
2082 subs.addr = s->info.dest;
2083 } else {
2084 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2085 subs.addr = s->info.sender;
2086 }
2087 subs.flags = s->info.flags;
2088 subs.queue = s->info.queue;
2089 result = 0;
2090 break;
2091 }
2092 }
2093 up_read(&group->list_mutex);
2094
2095 __end:
2096 if (port)
2097 snd_seq_port_unlock(port);
2098 if (cptr)
2099 snd_seq_client_unlock(cptr);
2100 if (result >= 0) {
2101 if (copy_to_user(arg, &subs, sizeof(subs)))
2102 return -EFAULT;
2103 }
2104 return result;
2105 }
2106
2107
2108 /*
2109 * query next client
2110 */
snd_seq_ioctl_query_next_client(struct snd_seq_client * client,void __user * arg)2111 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2112 void __user *arg)
2113 {
2114 struct snd_seq_client *cptr = NULL;
2115 struct snd_seq_client_info info;
2116
2117 if (copy_from_user(&info, arg, sizeof(info)))
2118 return -EFAULT;
2119
2120 /* search for next client */
2121 info.client++;
2122 if (info.client < 0)
2123 info.client = 0;
2124 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2125 cptr = snd_seq_client_use_ptr(info.client);
2126 if (cptr)
2127 break; /* found */
2128 }
2129 if (cptr == NULL)
2130 return -ENOENT;
2131
2132 get_client_info(cptr, &info);
2133 snd_seq_client_unlock(cptr);
2134
2135 if (copy_to_user(arg, &info, sizeof(info)))
2136 return -EFAULT;
2137 return 0;
2138 }
2139
2140 /*
2141 * query next port
2142 */
snd_seq_ioctl_query_next_port(struct snd_seq_client * client,void __user * arg)2143 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2144 void __user *arg)
2145 {
2146 struct snd_seq_client *cptr;
2147 struct snd_seq_client_port *port = NULL;
2148 struct snd_seq_port_info info;
2149
2150 if (copy_from_user(&info, arg, sizeof(info)))
2151 return -EFAULT;
2152 cptr = snd_seq_client_use_ptr(info.addr.client);
2153 if (cptr == NULL)
2154 return -ENXIO;
2155
2156 /* search for next port */
2157 info.addr.port++;
2158 port = snd_seq_port_query_nearest(cptr, &info);
2159 if (port == NULL) {
2160 snd_seq_client_unlock(cptr);
2161 return -ENOENT;
2162 }
2163
2164 /* get port info */
2165 info.addr = port->addr;
2166 snd_seq_get_port_info(port, &info);
2167 snd_seq_port_unlock(port);
2168 snd_seq_client_unlock(cptr);
2169
2170 if (copy_to_user(arg, &info, sizeof(info)))
2171 return -EFAULT;
2172 return 0;
2173 }
2174
2175 /* -------------------------------------------------------- */
2176
2177 static struct seq_ioctl_table {
2178 unsigned int cmd;
2179 int (*func)(struct snd_seq_client *client, void __user * arg);
2180 } ioctl_tables[] = {
2181 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2182 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2183 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2184 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2185 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2186 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2187 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2188 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2189 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2190 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2191 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2192 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2193 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2194 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2195 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2196 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2197 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2198 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2199 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2200 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2201 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2202 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2203 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2204 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2205 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2206 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2207 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2208 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2209 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2210 { 0, NULL },
2211 };
2212
snd_seq_do_ioctl(struct snd_seq_client * client,unsigned int cmd,void __user * arg)2213 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2214 void __user *arg)
2215 {
2216 struct seq_ioctl_table *p;
2217
2218 switch (cmd) {
2219 case SNDRV_SEQ_IOCTL_PVERSION:
2220 /* return sequencer version number */
2221 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2222 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2223 /* return the id of this client */
2224 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2225 }
2226
2227 if (! arg)
2228 return -EFAULT;
2229 for (p = ioctl_tables; p->cmd; p++) {
2230 if (p->cmd == cmd)
2231 return p->func(client, arg);
2232 }
2233 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2234 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2235 return -ENOTTY;
2236 }
2237
2238
snd_seq_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2239 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2240 {
2241 struct snd_seq_client *client = file->private_data;
2242 long ret;
2243
2244 if (snd_BUG_ON(!client))
2245 return -ENXIO;
2246
2247 mutex_lock(&client->ioctl_mutex);
2248 ret = snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2249 mutex_unlock(&client->ioctl_mutex);
2250 return ret;
2251 }
2252
2253 #ifdef CONFIG_COMPAT
2254 #include "seq_compat.c"
2255 #else
2256 #define snd_seq_ioctl_compat NULL
2257 #endif
2258
2259 /* -------------------------------------------------------- */
2260
2261
2262 /* exported to kernel modules */
snd_seq_create_kernel_client(struct snd_card * card,int client_index,const char * name_fmt,...)2263 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2264 const char *name_fmt, ...)
2265 {
2266 struct snd_seq_client *client;
2267 va_list args;
2268
2269 if (snd_BUG_ON(in_interrupt()))
2270 return -EBUSY;
2271
2272 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2273 return -EINVAL;
2274 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2275 return -EINVAL;
2276
2277 if (mutex_lock_interruptible(®ister_mutex))
2278 return -ERESTARTSYS;
2279
2280 if (card) {
2281 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2282 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2283 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2284 client_index = -1;
2285 }
2286
2287 /* empty write queue as default */
2288 client = seq_create_client1(client_index, 0);
2289 if (client == NULL) {
2290 mutex_unlock(®ister_mutex);
2291 return -EBUSY; /* failure code */
2292 }
2293 usage_alloc(&client_usage, 1);
2294
2295 client->accept_input = 1;
2296 client->accept_output = 1;
2297
2298 va_start(args, name_fmt);
2299 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2300 va_end(args);
2301
2302 client->type = KERNEL_CLIENT;
2303 mutex_unlock(®ister_mutex);
2304
2305 /* make others aware this new client */
2306 snd_seq_system_client_ev_client_start(client->number);
2307
2308 /* return client number to caller */
2309 return client->number;
2310 }
2311
2312 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2313
2314 /* exported to kernel modules */
snd_seq_delete_kernel_client(int client)2315 int snd_seq_delete_kernel_client(int client)
2316 {
2317 struct snd_seq_client *ptr;
2318
2319 if (snd_BUG_ON(in_interrupt()))
2320 return -EBUSY;
2321
2322 ptr = clientptr(client);
2323 if (ptr == NULL)
2324 return -EINVAL;
2325
2326 seq_free_client(ptr);
2327 kfree(ptr);
2328 return 0;
2329 }
2330
2331 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2332
2333 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2334 * and snd_seq_kernel_client_enqueue_blocking
2335 */
kernel_client_enqueue(int client,struct snd_seq_event * ev,struct file * file,int blocking,int atomic,int hop)2336 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2337 struct file *file, int blocking,
2338 int atomic, int hop)
2339 {
2340 struct snd_seq_client *cptr;
2341 int result;
2342
2343 if (snd_BUG_ON(!ev))
2344 return -EINVAL;
2345
2346 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2347 return 0; /* ignore this */
2348 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2349 return -EINVAL; /* quoted events can't be enqueued */
2350
2351 /* fill in client number */
2352 ev->source.client = client;
2353
2354 if (check_event_type_and_length(ev))
2355 return -EINVAL;
2356
2357 cptr = snd_seq_client_use_ptr(client);
2358 if (cptr == NULL)
2359 return -EINVAL;
2360
2361 if (! cptr->accept_output)
2362 result = -EPERM;
2363 else /* send it */
2364 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2365 atomic, hop, NULL);
2366
2367 snd_seq_client_unlock(cptr);
2368 return result;
2369 }
2370
2371 /*
2372 * exported, called by kernel clients to enqueue events (w/o blocking)
2373 *
2374 * RETURN VALUE: zero if succeed, negative if error
2375 */
snd_seq_kernel_client_enqueue(int client,struct snd_seq_event * ev,int atomic,int hop)2376 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2377 int atomic, int hop)
2378 {
2379 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2380 }
2381
2382 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2383
2384 /*
2385 * exported, called by kernel clients to enqueue events (with blocking)
2386 *
2387 * RETURN VALUE: zero if succeed, negative if error
2388 */
snd_seq_kernel_client_enqueue_blocking(int client,struct snd_seq_event * ev,struct file * file,int atomic,int hop)2389 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2390 struct file *file,
2391 int atomic, int hop)
2392 {
2393 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2394 }
2395
2396 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2397
2398 /*
2399 * exported, called by kernel clients to dispatch events directly to other
2400 * clients, bypassing the queues. Event time-stamp will be updated.
2401 *
2402 * RETURN VALUE: negative = delivery failed,
2403 * zero, or positive: the number of delivered events
2404 */
snd_seq_kernel_client_dispatch(int client,struct snd_seq_event * ev,int atomic,int hop)2405 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2406 int atomic, int hop)
2407 {
2408 struct snd_seq_client *cptr;
2409 int result;
2410
2411 if (snd_BUG_ON(!ev))
2412 return -EINVAL;
2413
2414 /* fill in client number */
2415 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2416 ev->source.client = client;
2417
2418 if (check_event_type_and_length(ev))
2419 return -EINVAL;
2420
2421 cptr = snd_seq_client_use_ptr(client);
2422 if (cptr == NULL)
2423 return -EINVAL;
2424
2425 if (!cptr->accept_output)
2426 result = -EPERM;
2427 else
2428 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2429
2430 snd_seq_client_unlock(cptr);
2431 return result;
2432 }
2433
2434 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2435
2436 /*
2437 * exported, called by kernel clients to perform same functions as with
2438 * userland ioctl()
2439 */
snd_seq_kernel_client_ctl(int clientid,unsigned int cmd,void * arg)2440 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2441 {
2442 struct snd_seq_client *client;
2443 mm_segment_t fs;
2444 int result;
2445
2446 client = clientptr(clientid);
2447 if (client == NULL)
2448 return -ENXIO;
2449 fs = snd_enter_user();
2450 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2451 snd_leave_user(fs);
2452 return result;
2453 }
2454
2455 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2456
2457 /* exported (for OSS emulator) */
snd_seq_kernel_client_write_poll(int clientid,struct file * file,poll_table * wait)2458 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2459 {
2460 struct snd_seq_client *client;
2461
2462 client = clientptr(clientid);
2463 if (client == NULL)
2464 return -ENXIO;
2465
2466 if (! snd_seq_write_pool_allocated(client))
2467 return 1;
2468 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2469 return 1;
2470 return 0;
2471 }
2472
2473 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2474
2475 /*---------------------------------------------------------------------------*/
2476
2477 #ifdef CONFIG_SND_PROC_FS
2478 /*
2479 * /proc interface
2480 */
snd_seq_info_dump_subscribers(struct snd_info_buffer * buffer,struct snd_seq_port_subs_info * group,int is_src,char * msg)2481 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2482 struct snd_seq_port_subs_info *group,
2483 int is_src, char *msg)
2484 {
2485 struct list_head *p;
2486 struct snd_seq_subscribers *s;
2487 int count = 0;
2488
2489 down_read(&group->list_mutex);
2490 if (list_empty(&group->list_head)) {
2491 up_read(&group->list_mutex);
2492 return;
2493 }
2494 snd_iprintf(buffer, msg);
2495 list_for_each(p, &group->list_head) {
2496 if (is_src)
2497 s = list_entry(p, struct snd_seq_subscribers, src_list);
2498 else
2499 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2500 if (count++)
2501 snd_iprintf(buffer, ", ");
2502 snd_iprintf(buffer, "%d:%d",
2503 is_src ? s->info.dest.client : s->info.sender.client,
2504 is_src ? s->info.dest.port : s->info.sender.port);
2505 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2506 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2507 if (group->exclusive)
2508 snd_iprintf(buffer, "[ex]");
2509 }
2510 up_read(&group->list_mutex);
2511 snd_iprintf(buffer, "\n");
2512 }
2513
2514 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2515 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2516 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2517
2518 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2519
snd_seq_info_dump_ports(struct snd_info_buffer * buffer,struct snd_seq_client * client)2520 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2521 struct snd_seq_client *client)
2522 {
2523 struct snd_seq_client_port *p;
2524
2525 mutex_lock(&client->ports_mutex);
2526 list_for_each_entry(p, &client->ports_list_head, list) {
2527 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2528 p->addr.port, p->name,
2529 FLAG_PERM_RD(p->capability),
2530 FLAG_PERM_WR(p->capability),
2531 FLAG_PERM_EX(p->capability),
2532 FLAG_PERM_DUPLEX(p->capability));
2533 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2534 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2535 }
2536 mutex_unlock(&client->ports_mutex);
2537 }
2538
2539
2540 /* exported to seq_info.c */
snd_seq_info_clients_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2541 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2542 struct snd_info_buffer *buffer)
2543 {
2544 int c;
2545 struct snd_seq_client *client;
2546
2547 snd_iprintf(buffer, "Client info\n");
2548 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2549 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2550 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2551 snd_iprintf(buffer, "\n");
2552
2553 /* list the client table */
2554 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2555 client = snd_seq_client_use_ptr(c);
2556 if (client == NULL)
2557 continue;
2558 if (client->type == NO_CLIENT) {
2559 snd_seq_client_unlock(client);
2560 continue;
2561 }
2562
2563 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2564 c, client->name,
2565 client->type == USER_CLIENT ? "User" : "Kernel");
2566 snd_seq_info_dump_ports(buffer, client);
2567 if (snd_seq_write_pool_allocated(client)) {
2568 snd_iprintf(buffer, " Output pool :\n");
2569 snd_seq_info_pool(buffer, client->pool, " ");
2570 }
2571 if (client->type == USER_CLIENT && client->data.user.fifo &&
2572 client->data.user.fifo->pool) {
2573 snd_iprintf(buffer, " Input pool :\n");
2574 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2575 }
2576 snd_seq_client_unlock(client);
2577 }
2578 }
2579 #endif /* CONFIG_SND_PROC_FS */
2580
2581 /*---------------------------------------------------------------------------*/
2582
2583
2584 /*
2585 * REGISTRATION PART
2586 */
2587
2588 static const struct file_operations snd_seq_f_ops =
2589 {
2590 .owner = THIS_MODULE,
2591 .read = snd_seq_read,
2592 .write = snd_seq_write,
2593 .open = snd_seq_open,
2594 .release = snd_seq_release,
2595 .llseek = no_llseek,
2596 .poll = snd_seq_poll,
2597 .unlocked_ioctl = snd_seq_ioctl,
2598 .compat_ioctl = snd_seq_ioctl_compat,
2599 };
2600
2601 static struct device seq_dev;
2602
2603 /*
2604 * register sequencer device
2605 */
snd_sequencer_device_init(void)2606 int __init snd_sequencer_device_init(void)
2607 {
2608 int err;
2609
2610 snd_device_initialize(&seq_dev, NULL);
2611 dev_set_name(&seq_dev, "seq");
2612
2613 if (mutex_lock_interruptible(®ister_mutex))
2614 return -ERESTARTSYS;
2615
2616 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2617 &snd_seq_f_ops, NULL, &seq_dev);
2618 if (err < 0) {
2619 mutex_unlock(®ister_mutex);
2620 put_device(&seq_dev);
2621 return err;
2622 }
2623
2624 mutex_unlock(®ister_mutex);
2625
2626 return 0;
2627 }
2628
2629
2630
2631 /*
2632 * unregister sequencer device
2633 */
snd_sequencer_device_done(void)2634 void __exit snd_sequencer_device_done(void)
2635 {
2636 snd_unregister_device(&seq_dev);
2637 put_device(&seq_dev);
2638 }
2639