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 		snd_printd("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 		snd_printd("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 
240 	/* find free slot in the client table */
241 	spin_lock_irqsave(&clients_lock, flags);
242 	if (client_index < 0) {
243 		for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
244 		     c < SNDRV_SEQ_MAX_CLIENTS;
245 		     c++) {
246 			if (clienttab[c] || clienttablock[c])
247 				continue;
248 			clienttab[client->number = c] = client;
249 			spin_unlock_irqrestore(&clients_lock, flags);
250 			return client;
251 		}
252 	} else {
253 		if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
254 			clienttab[client->number = client_index] = client;
255 			spin_unlock_irqrestore(&clients_lock, flags);
256 			return client;
257 		}
258 	}
259 	spin_unlock_irqrestore(&clients_lock, flags);
260 	snd_seq_pool_delete(&client->pool);
261 	kfree(client);
262 	return NULL;	/* no free slot found or busy, return failure code */
263 }
264 
265 
seq_free_client1(struct snd_seq_client * client)266 static int seq_free_client1(struct snd_seq_client *client)
267 {
268 	unsigned long flags;
269 
270 	if (!client)
271 		return 0;
272 	snd_seq_delete_all_ports(client);
273 	snd_seq_queue_client_leave(client->number);
274 	spin_lock_irqsave(&clients_lock, flags);
275 	clienttablock[client->number] = 1;
276 	clienttab[client->number] = NULL;
277 	spin_unlock_irqrestore(&clients_lock, flags);
278 	snd_use_lock_sync(&client->use_lock);
279 	snd_seq_queue_client_termination(client->number);
280 	if (client->pool)
281 		snd_seq_pool_delete(&client->pool);
282 	spin_lock_irqsave(&clients_lock, flags);
283 	clienttablock[client->number] = 0;
284 	spin_unlock_irqrestore(&clients_lock, flags);
285 	return 0;
286 }
287 
288 
seq_free_client(struct snd_seq_client * client)289 static void seq_free_client(struct snd_seq_client * client)
290 {
291 	mutex_lock(&register_mutex);
292 	switch (client->type) {
293 	case NO_CLIENT:
294 		snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
295 			   client->number);
296 		break;
297 	case USER_CLIENT:
298 	case KERNEL_CLIENT:
299 		seq_free_client1(client);
300 		usage_free(&client_usage, 1);
301 		break;
302 
303 	default:
304 		snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
305 			   client->number, client->type);
306 	}
307 	mutex_unlock(&register_mutex);
308 
309 	snd_seq_system_client_ev_client_exit(client->number);
310 }
311 
312 
313 
314 /* -------------------------------------------------------- */
315 
316 /* create a user client */
snd_seq_open(struct inode * inode,struct file * file)317 static int snd_seq_open(struct inode *inode, struct file *file)
318 {
319 	int c, mode;			/* client id */
320 	struct snd_seq_client *client;
321 	struct snd_seq_user_client *user;
322 	int err;
323 
324 	err = nonseekable_open(inode, file);
325 	if (err < 0)
326 		return err;
327 
328 	if (mutex_lock_interruptible(&register_mutex))
329 		return -ERESTARTSYS;
330 	client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
331 	if (client == NULL) {
332 		mutex_unlock(&register_mutex);
333 		return -ENOMEM;	/* failure code */
334 	}
335 
336 	mode = snd_seq_file_flags(file);
337 	if (mode & SNDRV_SEQ_LFLG_INPUT)
338 		client->accept_input = 1;
339 	if (mode & SNDRV_SEQ_LFLG_OUTPUT)
340 		client->accept_output = 1;
341 
342 	user = &client->data.user;
343 	user->fifo = NULL;
344 	user->fifo_pool_size = 0;
345 
346 	if (mode & SNDRV_SEQ_LFLG_INPUT) {
347 		user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
348 		user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
349 		if (user->fifo == NULL) {
350 			seq_free_client1(client);
351 			kfree(client);
352 			mutex_unlock(&register_mutex);
353 			return -ENOMEM;
354 		}
355 	}
356 
357 	usage_alloc(&client_usage, 1);
358 	client->type = USER_CLIENT;
359 	mutex_unlock(&register_mutex);
360 
361 	c = client->number;
362 	file->private_data = client;
363 
364 	/* fill client data */
365 	user->file = file;
366 	sprintf(client->name, "Client-%d", c);
367 
368 	/* make others aware this new client */
369 	snd_seq_system_client_ev_client_start(c);
370 
371 	return 0;
372 }
373 
374 /* delete a user client */
snd_seq_release(struct inode * inode,struct file * file)375 static int snd_seq_release(struct inode *inode, struct file *file)
376 {
377 	struct snd_seq_client *client = file->private_data;
378 
379 	if (client) {
380 		seq_free_client(client);
381 		if (client->data.user.fifo)
382 			snd_seq_fifo_delete(&client->data.user.fifo);
383 		kfree(client);
384 	}
385 
386 	return 0;
387 }
388 
389 
390 /* handle client read() */
391 /* possible error values:
392  *	-ENXIO	invalid client or file open mode
393  *	-ENOSPC	FIFO overflow (the flag is cleared after this error report)
394  *	-EINVAL	no enough user-space buffer to write the whole event
395  *	-EFAULT	seg. fault during copy to user space
396  */
snd_seq_read(struct file * file,char __user * buf,size_t count,loff_t * offset)397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
398 			    loff_t *offset)
399 {
400 	struct snd_seq_client *client = file->private_data;
401 	struct snd_seq_fifo *fifo;
402 	int err;
403 	long result = 0;
404 	struct snd_seq_event_cell *cell;
405 
406 	if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
407 		return -ENXIO;
408 
409 	if (!access_ok(VERIFY_WRITE, buf, count))
410 		return -EFAULT;
411 
412 	/* check client structures are in place */
413 	if (snd_BUG_ON(!client))
414 		return -ENXIO;
415 
416 	if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
417 		return -ENXIO;
418 
419 	if (atomic_read(&fifo->overflow) > 0) {
420 		/* buffer overflow is detected */
421 		snd_seq_fifo_clear(fifo);
422 		/* return error code */
423 		return -ENOSPC;
424 	}
425 
426 	cell = NULL;
427 	err = 0;
428 	snd_seq_fifo_lock(fifo);
429 
430 	/* while data available in queue */
431 	while (count >= sizeof(struct snd_seq_event)) {
432 		int nonblock;
433 
434 		nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
435 		if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
436 			break;
437 		}
438 		if (snd_seq_ev_is_variable(&cell->event)) {
439 			struct snd_seq_event tmpev;
440 			tmpev = cell->event;
441 			tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
442 			if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
443 				err = -EFAULT;
444 				break;
445 			}
446 			count -= sizeof(struct snd_seq_event);
447 			buf += sizeof(struct snd_seq_event);
448 			err = snd_seq_expand_var_event(&cell->event, count,
449 						       (char __force *)buf, 0,
450 						       sizeof(struct snd_seq_event));
451 			if (err < 0)
452 				break;
453 			result += err;
454 			count -= err;
455 			buf += err;
456 		} else {
457 			if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
458 				err = -EFAULT;
459 				break;
460 			}
461 			count -= sizeof(struct snd_seq_event);
462 			buf += sizeof(struct snd_seq_event);
463 		}
464 		snd_seq_cell_free(cell);
465 		cell = NULL; /* to be sure */
466 		result += sizeof(struct snd_seq_event);
467 	}
468 
469 	if (err < 0) {
470 		if (cell)
471 			snd_seq_fifo_cell_putback(fifo, cell);
472 		if (err == -EAGAIN && result > 0)
473 			err = 0;
474 	}
475 	snd_seq_fifo_unlock(fifo);
476 
477 	return (err < 0) ? err : result;
478 }
479 
480 
481 /*
482  * check access permission to the port
483  */
check_port_perm(struct snd_seq_client_port * port,unsigned int flags)484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
485 {
486 	if ((port->capability & flags) != flags)
487 		return 0;
488 	return flags;
489 }
490 
491 /*
492  * check if the destination client is available, and return the pointer
493  * if filter is non-zero, client filter bitmap is tested.
494  */
get_event_dest_client(struct snd_seq_event * event,int filter)495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
496 						    int filter)
497 {
498 	struct snd_seq_client *dest;
499 
500 	dest = snd_seq_client_use_ptr(event->dest.client);
501 	if (dest == NULL)
502 		return NULL;
503 	if (! dest->accept_input)
504 		goto __not_avail;
505 	if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
506 	    ! test_bit(event->type, dest->event_filter))
507 		goto __not_avail;
508 	if (filter && !(dest->filter & filter))
509 		goto __not_avail;
510 
511 	return dest; /* ok - accessible */
512 __not_avail:
513 	snd_seq_client_unlock(dest);
514 	return NULL;
515 }
516 
517 
518 /*
519  * Return the error event.
520  *
521  * If the receiver client is a user client, the original event is
522  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
523  * the original event is also variable length, the external data is
524  * copied after the event record.
525  * If the receiver client is a kernel client, the original event is
526  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
527  * kmalloc.
528  */
bounce_error_event(struct snd_seq_client * client,struct snd_seq_event * event,int err,int atomic,int hop)529 static int bounce_error_event(struct snd_seq_client *client,
530 			      struct snd_seq_event *event,
531 			      int err, int atomic, int hop)
532 {
533 	struct snd_seq_event bounce_ev;
534 	int result;
535 
536 	if (client == NULL ||
537 	    ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
538 	    ! client->accept_input)
539 		return 0; /* ignored */
540 
541 	/* set up quoted error */
542 	memset(&bounce_ev, 0, sizeof(bounce_ev));
543 	bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
544 	bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
545 	bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
546 	bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
547 	bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
548 	bounce_ev.dest.client = client->number;
549 	bounce_ev.dest.port = event->source.port;
550 	bounce_ev.data.quote.origin = event->dest;
551 	bounce_ev.data.quote.event = event;
552 	bounce_ev.data.quote.value = -err; /* use positive value */
553 	result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
554 	if (result < 0) {
555 		client->event_lost++;
556 		return result;
557 	}
558 
559 	return result;
560 }
561 
562 
563 /*
564  * rewrite the time-stamp of the event record with the curren time
565  * of the given queue.
566  * return non-zero if updated.
567  */
update_timestamp_of_queue(struct snd_seq_event * event,int queue,int real_time)568 static int update_timestamp_of_queue(struct snd_seq_event *event,
569 				     int queue, int real_time)
570 {
571 	struct snd_seq_queue *q;
572 
573 	q = queueptr(queue);
574 	if (! q)
575 		return 0;
576 	event->queue = queue;
577 	event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
578 	if (real_time) {
579 		event->time.time = snd_seq_timer_get_cur_time(q->timer);
580 		event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
581 	} else {
582 		event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
583 		event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
584 	}
585 	queuefree(q);
586 	return 1;
587 }
588 
589 
590 /*
591  * deliver an event to the specified destination.
592  * if filter is non-zero, client filter bitmap is tested.
593  *
594  *  RETURN VALUE: 0 : if succeeded
595  *		 <0 : error
596  */
snd_seq_deliver_single_event(struct snd_seq_client * client,struct snd_seq_event * event,int filter,int atomic,int hop)597 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
598 					struct snd_seq_event *event,
599 					int filter, int atomic, int hop)
600 {
601 	struct snd_seq_client *dest = NULL;
602 	struct snd_seq_client_port *dest_port = NULL;
603 	int result = -ENOENT;
604 	int direct;
605 
606 	direct = snd_seq_ev_is_direct(event);
607 
608 	dest = get_event_dest_client(event, filter);
609 	if (dest == NULL)
610 		goto __skip;
611 	dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
612 	if (dest_port == NULL)
613 		goto __skip;
614 
615 	/* check permission */
616 	if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
617 		result = -EPERM;
618 		goto __skip;
619 	}
620 
621 	if (dest_port->timestamping)
622 		update_timestamp_of_queue(event, dest_port->time_queue,
623 					  dest_port->time_real);
624 
625 	switch (dest->type) {
626 	case USER_CLIENT:
627 		if (dest->data.user.fifo)
628 			result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
629 		break;
630 
631 	case KERNEL_CLIENT:
632 		if (dest_port->event_input == NULL)
633 			break;
634 		result = dest_port->event_input(event, direct,
635 						dest_port->private_data,
636 						atomic, hop);
637 		break;
638 	default:
639 		break;
640 	}
641 
642   __skip:
643 	if (dest_port)
644 		snd_seq_port_unlock(dest_port);
645 	if (dest)
646 		snd_seq_client_unlock(dest);
647 
648 	if (result < 0 && !direct) {
649 		result = bounce_error_event(client, event, result, atomic, hop);
650 	}
651 	return result;
652 }
653 
654 
655 /*
656  * send the event to all subscribers:
657  */
deliver_to_subscribers(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)658 static int deliver_to_subscribers(struct snd_seq_client *client,
659 				  struct snd_seq_event *event,
660 				  int atomic, int hop)
661 {
662 	struct snd_seq_subscribers *subs;
663 	int err = 0, num_ev = 0;
664 	struct snd_seq_event event_saved;
665 	struct snd_seq_client_port *src_port;
666 	struct snd_seq_port_subs_info *grp;
667 
668 	src_port = snd_seq_port_use_ptr(client, event->source.port);
669 	if (src_port == NULL)
670 		return -EINVAL; /* invalid source port */
671 	/* save original event record */
672 	event_saved = *event;
673 	grp = &src_port->c_src;
674 
675 	/* lock list */
676 	if (atomic)
677 		read_lock(&grp->list_lock);
678 	else
679 		down_read(&grp->list_mutex);
680 	list_for_each_entry(subs, &grp->list_head, src_list) {
681 		event->dest = subs->info.dest;
682 		if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
683 			/* convert time according to flag with subscription */
684 			update_timestamp_of_queue(event, subs->info.queue,
685 						  subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
686 		err = snd_seq_deliver_single_event(client, event,
687 						   0, atomic, hop);
688 		if (err < 0)
689 			break;
690 		num_ev++;
691 		/* restore original event record */
692 		*event = event_saved;
693 	}
694 	if (atomic)
695 		read_unlock(&grp->list_lock);
696 	else
697 		up_read(&grp->list_mutex);
698 	*event = event_saved; /* restore */
699 	snd_seq_port_unlock(src_port);
700 	return (err < 0) ? err : num_ev;
701 }
702 
703 
704 #ifdef SUPPORT_BROADCAST
705 /*
706  * broadcast to all ports:
707  */
port_broadcast_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)708 static int port_broadcast_event(struct snd_seq_client *client,
709 				struct snd_seq_event *event,
710 				int atomic, int hop)
711 {
712 	int num_ev = 0, err = 0;
713 	struct snd_seq_client *dest_client;
714 	struct snd_seq_client_port *port;
715 
716 	dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
717 	if (dest_client == NULL)
718 		return 0; /* no matching destination */
719 
720 	read_lock(&dest_client->ports_lock);
721 	list_for_each_entry(port, &dest_client->ports_list_head, list) {
722 		event->dest.port = port->addr.port;
723 		/* pass NULL as source client to avoid error bounce */
724 		err = snd_seq_deliver_single_event(NULL, event,
725 						   SNDRV_SEQ_FILTER_BROADCAST,
726 						   atomic, hop);
727 		if (err < 0)
728 			break;
729 		num_ev++;
730 	}
731 	read_unlock(&dest_client->ports_lock);
732 	snd_seq_client_unlock(dest_client);
733 	event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
734 	return (err < 0) ? err : num_ev;
735 }
736 
737 /*
738  * send the event to all clients:
739  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
740  */
broadcast_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)741 static int broadcast_event(struct snd_seq_client *client,
742 			   struct snd_seq_event *event, int atomic, int hop)
743 {
744 	int err = 0, num_ev = 0;
745 	int dest;
746 	struct snd_seq_addr addr;
747 
748 	addr = event->dest; /* save */
749 
750 	for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
751 		/* don't send to itself */
752 		if (dest == client->number)
753 			continue;
754 		event->dest.client = dest;
755 		event->dest.port = addr.port;
756 		if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
757 			err = port_broadcast_event(client, event, atomic, hop);
758 		else
759 			/* pass NULL as source client to avoid error bounce */
760 			err = snd_seq_deliver_single_event(NULL, event,
761 							   SNDRV_SEQ_FILTER_BROADCAST,
762 							   atomic, hop);
763 		if (err < 0)
764 			break;
765 		num_ev += err;
766 	}
767 	event->dest = addr; /* restore */
768 	return (err < 0) ? err : num_ev;
769 }
770 
771 
772 /* multicast - not supported yet */
multicast_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)773 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
774 			   int atomic, int hop)
775 {
776 	snd_printd("seq: multicast not supported yet.\n");
777 	return 0; /* ignored */
778 }
779 #endif /* SUPPORT_BROADCAST */
780 
781 
782 /* deliver an event to the destination port(s).
783  * if the event is to subscribers or broadcast, the event is dispatched
784  * to multiple targets.
785  *
786  * RETURN VALUE: n > 0  : the number of delivered events.
787  *               n == 0 : the event was not passed to any client.
788  *               n < 0  : error - event was not processed.
789  */
snd_seq_deliver_event(struct snd_seq_client * client,struct snd_seq_event * event,int atomic,int hop)790 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
791 				 int atomic, int hop)
792 {
793 	int result;
794 
795 	hop++;
796 	if (hop >= SNDRV_SEQ_MAX_HOPS) {
797 		snd_printd("too long delivery path (%d:%d->%d:%d)\n",
798 			   event->source.client, event->source.port,
799 			   event->dest.client, event->dest.port);
800 		return -EMLINK;
801 	}
802 
803 	if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
804 	    event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
805 		result = deliver_to_subscribers(client, event, atomic, hop);
806 #ifdef SUPPORT_BROADCAST
807 	else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
808 		 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
809 		result = broadcast_event(client, event, atomic, hop);
810 	else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
811 		result = multicast_event(client, event, atomic, hop);
812 	else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
813 		result = port_broadcast_event(client, event, atomic, hop);
814 #endif
815 	else
816 		result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
817 
818 	return result;
819 }
820 
821 /*
822  * dispatch an event cell:
823  * This function is called only from queue check routines in timer
824  * interrupts or after enqueued.
825  * The event cell shall be released or re-queued in this function.
826  *
827  * RETURN VALUE: n > 0  : the number of delivered events.
828  *		 n == 0 : the event was not passed to any client.
829  *		 n < 0  : error - event was not processed.
830  */
snd_seq_dispatch_event(struct snd_seq_event_cell * cell,int atomic,int hop)831 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
832 {
833 	struct snd_seq_client *client;
834 	int result;
835 
836 	if (snd_BUG_ON(!cell))
837 		return -EINVAL;
838 
839 	client = snd_seq_client_use_ptr(cell->event.source.client);
840 	if (client == NULL) {
841 		snd_seq_cell_free(cell); /* release this cell */
842 		return -EINVAL;
843 	}
844 
845 	if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
846 		/* NOTE event:
847 		 * the event cell is re-used as a NOTE-OFF event and
848 		 * enqueued again.
849 		 */
850 		struct snd_seq_event tmpev, *ev;
851 
852 		/* reserve this event to enqueue note-off later */
853 		tmpev = cell->event;
854 		tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
855 		result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
856 
857 		/*
858 		 * This was originally a note event.  We now re-use the
859 		 * cell for the note-off event.
860 		 */
861 
862 		ev = &cell->event;
863 		ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
864 		ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
865 
866 		/* add the duration time */
867 		switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
868 		case SNDRV_SEQ_TIME_STAMP_TICK:
869 			ev->time.tick += ev->data.note.duration;
870 			break;
871 		case SNDRV_SEQ_TIME_STAMP_REAL:
872 			/* unit for duration is ms */
873 			ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
874 			ev->time.time.tv_sec += ev->data.note.duration / 1000 +
875 						ev->time.time.tv_nsec / 1000000000;
876 			ev->time.time.tv_nsec %= 1000000000;
877 			break;
878 		}
879 		ev->data.note.velocity = ev->data.note.off_velocity;
880 
881 		/* Now queue this cell as the note off event */
882 		if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
883 			snd_seq_cell_free(cell); /* release this cell */
884 
885 	} else {
886 		/* Normal events:
887 		 * event cell is freed after processing the event
888 		 */
889 
890 		result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
891 		snd_seq_cell_free(cell);
892 	}
893 
894 	snd_seq_client_unlock(client);
895 	return result;
896 }
897 
898 
899 /* Allocate a cell from client pool and enqueue it to queue:
900  * if pool is empty and blocking is TRUE, sleep until a new cell is
901  * available.
902  */
snd_seq_client_enqueue_event(struct snd_seq_client * client,struct snd_seq_event * event,struct file * file,int blocking,int atomic,int hop)903 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
904 					struct snd_seq_event *event,
905 					struct file *file, int blocking,
906 					int atomic, int hop)
907 {
908 	struct snd_seq_event_cell *cell;
909 	int err;
910 
911 	/* special queue values - force direct passing */
912 	if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
913 		event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
914 		event->queue = SNDRV_SEQ_QUEUE_DIRECT;
915 	} else
916 #ifdef SUPPORT_BROADCAST
917 		if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
918 			event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
919 			event->queue = SNDRV_SEQ_QUEUE_DIRECT;
920 		}
921 #endif
922 	if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
923 		/* check presence of source port */
924 		struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
925 		if (src_port == NULL)
926 			return -EINVAL;
927 		snd_seq_port_unlock(src_port);
928 	}
929 
930 	/* direct event processing without enqueued */
931 	if (snd_seq_ev_is_direct(event)) {
932 		if (event->type == SNDRV_SEQ_EVENT_NOTE)
933 			return -EINVAL; /* this event must be enqueued! */
934 		return snd_seq_deliver_event(client, event, atomic, hop);
935 	}
936 
937 	/* Not direct, normal queuing */
938 	if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
939 		return -EINVAL;  /* invalid queue */
940 	if (! snd_seq_write_pool_allocated(client))
941 		return -ENXIO; /* queue is not allocated */
942 
943 	/* allocate an event cell */
944 	err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
945 	if (err < 0)
946 		return err;
947 
948 	/* we got a cell. enqueue it. */
949 	if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
950 		snd_seq_cell_free(cell);
951 		return err;
952 	}
953 
954 	return 0;
955 }
956 
957 
958 /*
959  * check validity of event type and data length.
960  * return non-zero if invalid.
961  */
check_event_type_and_length(struct snd_seq_event * ev)962 static int check_event_type_and_length(struct snd_seq_event *ev)
963 {
964 	switch (snd_seq_ev_length_type(ev)) {
965 	case SNDRV_SEQ_EVENT_LENGTH_FIXED:
966 		if (snd_seq_ev_is_variable_type(ev))
967 			return -EINVAL;
968 		break;
969 	case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
970 		if (! snd_seq_ev_is_variable_type(ev) ||
971 		    (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
972 			return -EINVAL;
973 		break;
974 	case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
975 		if (! snd_seq_ev_is_direct(ev))
976 			return -EINVAL;
977 		break;
978 	}
979 	return 0;
980 }
981 
982 
983 /* handle write() */
984 /* possible error values:
985  *	-ENXIO	invalid client or file open mode
986  *	-ENOMEM	malloc failed
987  *	-EFAULT	seg. fault during copy from user space
988  *	-EINVAL	invalid event
989  *	-EAGAIN	no space in output pool
990  *	-EINTR	interrupts while sleep
991  *	-EMLINK	too many hops
992  *	others	depends on return value from driver callback
993  */
snd_seq_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)994 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
995 			     size_t count, loff_t *offset)
996 {
997 	struct snd_seq_client *client = file->private_data;
998 	int written = 0, len;
999 	int err = -EINVAL;
1000 	struct snd_seq_event event;
1001 
1002 	if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1003 		return -ENXIO;
1004 
1005 	/* check client structures are in place */
1006 	if (snd_BUG_ON(!client))
1007 		return -ENXIO;
1008 
1009 	if (!client->accept_output || client->pool == NULL)
1010 		return -ENXIO;
1011 
1012 	/* allocate the pool now if the pool is not allocated yet */
1013 	if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1014 		if (snd_seq_pool_init(client->pool) < 0)
1015 			return -ENOMEM;
1016 	}
1017 
1018 	/* only process whole events */
1019 	while (count >= sizeof(struct snd_seq_event)) {
1020 		/* Read in the event header from the user */
1021 		len = sizeof(event);
1022 		if (copy_from_user(&event, buf, len)) {
1023 			err = -EFAULT;
1024 			break;
1025 		}
1026 		event.source.client = client->number;	/* fill in client number */
1027 		/* Check for extension data length */
1028 		if (check_event_type_and_length(&event)) {
1029 			err = -EINVAL;
1030 			break;
1031 		}
1032 
1033 		/* check for special events */
1034 		if (event.type == SNDRV_SEQ_EVENT_NONE)
1035 			goto __skip_event;
1036 		else if (snd_seq_ev_is_reserved(&event)) {
1037 			err = -EINVAL;
1038 			break;
1039 		}
1040 
1041 		if (snd_seq_ev_is_variable(&event)) {
1042 			int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1043 			if ((size_t)(extlen + len) > count) {
1044 				/* back out, will get an error this time or next */
1045 				err = -EINVAL;
1046 				break;
1047 			}
1048 			/* set user space pointer */
1049 			event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1050 			event.data.ext.ptr = (char __force *)buf
1051 						+ sizeof(struct snd_seq_event);
1052 			len += extlen; /* increment data length */
1053 		} else {
1054 #ifdef CONFIG_COMPAT
1055 			if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1056 				void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1057 				event.data.ext.ptr = ptr;
1058 			}
1059 #endif
1060 		}
1061 
1062 		/* ok, enqueue it */
1063 		err = snd_seq_client_enqueue_event(client, &event, file,
1064 						   !(file->f_flags & O_NONBLOCK),
1065 						   0, 0);
1066 		if (err < 0)
1067 			break;
1068 
1069 	__skip_event:
1070 		/* Update pointers and counts */
1071 		count -= len;
1072 		buf += len;
1073 		written += len;
1074 	}
1075 
1076 	return written ? written : err;
1077 }
1078 
1079 
1080 /*
1081  * handle polling
1082  */
snd_seq_poll(struct file * file,poll_table * wait)1083 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1084 {
1085 	struct snd_seq_client *client = file->private_data;
1086 	unsigned int mask = 0;
1087 
1088 	/* check client structures are in place */
1089 	if (snd_BUG_ON(!client))
1090 		return -ENXIO;
1091 
1092 	if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1093 	    client->data.user.fifo) {
1094 
1095 		/* check if data is available in the outqueue */
1096 		if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1097 			mask |= POLLIN | POLLRDNORM;
1098 	}
1099 
1100 	if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1101 
1102 		/* check if data is available in the pool */
1103 		if (!snd_seq_write_pool_allocated(client) ||
1104 		    snd_seq_pool_poll_wait(client->pool, file, wait))
1105 			mask |= POLLOUT | POLLWRNORM;
1106 	}
1107 
1108 	return mask;
1109 }
1110 
1111 
1112 /*-----------------------------------------------------*/
1113 
1114 
1115 /* SYSTEM_INFO ioctl() */
snd_seq_ioctl_system_info(struct snd_seq_client * client,void __user * arg)1116 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1117 {
1118 	struct snd_seq_system_info info;
1119 
1120 	memset(&info, 0, sizeof(info));
1121 	/* fill the info fields */
1122 	info.queues = SNDRV_SEQ_MAX_QUEUES;
1123 	info.clients = SNDRV_SEQ_MAX_CLIENTS;
1124 	info.ports = 256;	/* fixed limit */
1125 	info.channels = 256;	/* fixed limit */
1126 	info.cur_clients = client_usage.cur;
1127 	info.cur_queues = snd_seq_queue_get_cur_queues();
1128 
1129 	if (copy_to_user(arg, &info, sizeof(info)))
1130 		return -EFAULT;
1131 	return 0;
1132 }
1133 
1134 
1135 /* RUNNING_MODE ioctl() */
snd_seq_ioctl_running_mode(struct snd_seq_client * client,void __user * arg)1136 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1137 {
1138 	struct snd_seq_running_info info;
1139 	struct snd_seq_client *cptr;
1140 	int err = 0;
1141 
1142 	if (copy_from_user(&info, arg, sizeof(info)))
1143 		return -EFAULT;
1144 
1145 	/* requested client number */
1146 	cptr = snd_seq_client_use_ptr(info.client);
1147 	if (cptr == NULL)
1148 		return -ENOENT;		/* don't change !!! */
1149 
1150 #ifdef SNDRV_BIG_ENDIAN
1151 	if (! info.big_endian) {
1152 		err = -EINVAL;
1153 		goto __err;
1154 	}
1155 #else
1156 	if (info.big_endian) {
1157 		err = -EINVAL;
1158 		goto __err;
1159 	}
1160 
1161 #endif
1162 	if (info.cpu_mode > sizeof(long)) {
1163 		err = -EINVAL;
1164 		goto __err;
1165 	}
1166 	cptr->convert32 = (info.cpu_mode < sizeof(long));
1167  __err:
1168 	snd_seq_client_unlock(cptr);
1169 	return err;
1170 }
1171 
1172 /* CLIENT_INFO ioctl() */
get_client_info(struct snd_seq_client * cptr,struct snd_seq_client_info * info)1173 static void get_client_info(struct snd_seq_client *cptr,
1174 			    struct snd_seq_client_info *info)
1175 {
1176 	info->client = cptr->number;
1177 
1178 	/* fill the info fields */
1179 	info->type = cptr->type;
1180 	strcpy(info->name, cptr->name);
1181 	info->filter = cptr->filter;
1182 	info->event_lost = cptr->event_lost;
1183 	memcpy(info->event_filter, cptr->event_filter, 32);
1184 	info->num_ports = cptr->num_ports;
1185 	memset(info->reserved, 0, sizeof(info->reserved));
1186 }
1187 
snd_seq_ioctl_get_client_info(struct snd_seq_client * client,void __user * arg)1188 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1189 					 void __user *arg)
1190 {
1191 	struct snd_seq_client *cptr;
1192 	struct snd_seq_client_info client_info;
1193 
1194 	if (copy_from_user(&client_info, arg, sizeof(client_info)))
1195 		return -EFAULT;
1196 
1197 	/* requested client number */
1198 	cptr = snd_seq_client_use_ptr(client_info.client);
1199 	if (cptr == NULL)
1200 		return -ENOENT;		/* don't change !!! */
1201 
1202 	get_client_info(cptr, &client_info);
1203 	snd_seq_client_unlock(cptr);
1204 
1205 	if (copy_to_user(arg, &client_info, sizeof(client_info)))
1206 		return -EFAULT;
1207 	return 0;
1208 }
1209 
1210 
1211 /* CLIENT_INFO ioctl() */
snd_seq_ioctl_set_client_info(struct snd_seq_client * client,void __user * arg)1212 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1213 					 void __user *arg)
1214 {
1215 	struct snd_seq_client_info client_info;
1216 
1217 	if (copy_from_user(&client_info, arg, sizeof(client_info)))
1218 		return -EFAULT;
1219 
1220 	/* it is not allowed to set the info fields for an another client */
1221 	if (client->number != client_info.client)
1222 		return -EPERM;
1223 	/* also client type must be set now */
1224 	if (client->type != client_info.type)
1225 		return -EINVAL;
1226 
1227 	/* fill the info fields */
1228 	if (client_info.name[0])
1229 		strlcpy(client->name, client_info.name, sizeof(client->name));
1230 
1231 	client->filter = client_info.filter;
1232 	client->event_lost = client_info.event_lost;
1233 	memcpy(client->event_filter, client_info.event_filter, 32);
1234 
1235 	return 0;
1236 }
1237 
1238 
1239 /*
1240  * CREATE PORT ioctl()
1241  */
snd_seq_ioctl_create_port(struct snd_seq_client * client,void __user * arg)1242 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1243 				     void __user *arg)
1244 {
1245 	struct snd_seq_client_port *port;
1246 	struct snd_seq_port_info info;
1247 	struct snd_seq_port_callback *callback;
1248 
1249 	if (copy_from_user(&info, arg, sizeof(info)))
1250 		return -EFAULT;
1251 
1252 	/* it is not allowed to create the port for an another client */
1253 	if (info.addr.client != client->number)
1254 		return -EPERM;
1255 
1256 	port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1257 	if (port == NULL)
1258 		return -ENOMEM;
1259 
1260 	if (client->type == USER_CLIENT && info.kernel) {
1261 		snd_seq_delete_port(client, port->addr.port);
1262 		return -EINVAL;
1263 	}
1264 	if (client->type == KERNEL_CLIENT) {
1265 		if ((callback = info.kernel) != NULL) {
1266 			if (callback->owner)
1267 				port->owner = callback->owner;
1268 			port->private_data = callback->private_data;
1269 			port->private_free = callback->private_free;
1270 			port->callback_all = callback->callback_all;
1271 			port->event_input = callback->event_input;
1272 			port->c_src.open = callback->subscribe;
1273 			port->c_src.close = callback->unsubscribe;
1274 			port->c_dest.open = callback->use;
1275 			port->c_dest.close = callback->unuse;
1276 		}
1277 	}
1278 
1279 	info.addr = port->addr;
1280 
1281 	snd_seq_set_port_info(port, &info);
1282 	snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1283 
1284 	if (copy_to_user(arg, &info, sizeof(info)))
1285 		return -EFAULT;
1286 
1287 	return 0;
1288 }
1289 
1290 /*
1291  * DELETE PORT ioctl()
1292  */
snd_seq_ioctl_delete_port(struct snd_seq_client * client,void __user * arg)1293 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1294 				     void __user *arg)
1295 {
1296 	struct snd_seq_port_info info;
1297 	int err;
1298 
1299 	/* set passed parameters */
1300 	if (copy_from_user(&info, arg, sizeof(info)))
1301 		return -EFAULT;
1302 
1303 	/* it is not allowed to remove the port for an another client */
1304 	if (info.addr.client != client->number)
1305 		return -EPERM;
1306 
1307 	err = snd_seq_delete_port(client, info.addr.port);
1308 	if (err >= 0)
1309 		snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1310 	return err;
1311 }
1312 
1313 
1314 /*
1315  * GET_PORT_INFO ioctl() (on any client)
1316  */
snd_seq_ioctl_get_port_info(struct snd_seq_client * client,void __user * arg)1317 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1318 				       void __user *arg)
1319 {
1320 	struct snd_seq_client *cptr;
1321 	struct snd_seq_client_port *port;
1322 	struct snd_seq_port_info info;
1323 
1324 	if (copy_from_user(&info, arg, sizeof(info)))
1325 		return -EFAULT;
1326 	cptr = snd_seq_client_use_ptr(info.addr.client);
1327 	if (cptr == NULL)
1328 		return -ENXIO;
1329 
1330 	port = snd_seq_port_use_ptr(cptr, info.addr.port);
1331 	if (port == NULL) {
1332 		snd_seq_client_unlock(cptr);
1333 		return -ENOENT;			/* don't change */
1334 	}
1335 
1336 	/* get port info */
1337 	snd_seq_get_port_info(port, &info);
1338 	snd_seq_port_unlock(port);
1339 	snd_seq_client_unlock(cptr);
1340 
1341 	if (copy_to_user(arg, &info, sizeof(info)))
1342 		return -EFAULT;
1343 	return 0;
1344 }
1345 
1346 
1347 /*
1348  * SET_PORT_INFO ioctl() (only ports on this/own client)
1349  */
snd_seq_ioctl_set_port_info(struct snd_seq_client * client,void __user * arg)1350 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1351 				       void __user *arg)
1352 {
1353 	struct snd_seq_client_port *port;
1354 	struct snd_seq_port_info info;
1355 
1356 	if (copy_from_user(&info, arg, sizeof(info)))
1357 		return -EFAULT;
1358 
1359 	if (info.addr.client != client->number) /* only set our own ports ! */
1360 		return -EPERM;
1361 	port = snd_seq_port_use_ptr(client, info.addr.port);
1362 	if (port) {
1363 		snd_seq_set_port_info(port, &info);
1364 		snd_seq_port_unlock(port);
1365 	}
1366 	return 0;
1367 }
1368 
1369 
1370 /*
1371  * port subscription (connection)
1372  */
1373 #define PERM_RD		(SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1374 #define PERM_WR		(SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1375 
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)1376 static int check_subscription_permission(struct snd_seq_client *client,
1377 					 struct snd_seq_client_port *sport,
1378 					 struct snd_seq_client_port *dport,
1379 					 struct snd_seq_port_subscribe *subs)
1380 {
1381 	if (client->number != subs->sender.client &&
1382 	    client->number != subs->dest.client) {
1383 		/* connection by third client - check export permission */
1384 		if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1385 			return -EPERM;
1386 		if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1387 			return -EPERM;
1388 	}
1389 
1390 	/* check read permission */
1391 	/* if sender or receiver is the subscribing client itself,
1392 	 * no permission check is necessary
1393 	 */
1394 	if (client->number != subs->sender.client) {
1395 		if (! check_port_perm(sport, PERM_RD))
1396 			return -EPERM;
1397 	}
1398 	/* check write permission */
1399 	if (client->number != subs->dest.client) {
1400 		if (! check_port_perm(dport, PERM_WR))
1401 			return -EPERM;
1402 	}
1403 	return 0;
1404 }
1405 
1406 /*
1407  * send an subscription notify event to user client:
1408  * client must be user client.
1409  */
snd_seq_client_notify_subscription(int client,int port,struct snd_seq_port_subscribe * info,int evtype)1410 int snd_seq_client_notify_subscription(int client, int port,
1411 				       struct snd_seq_port_subscribe *info,
1412 				       int evtype)
1413 {
1414 	struct snd_seq_event event;
1415 
1416 	memset(&event, 0, sizeof(event));
1417 	event.type = evtype;
1418 	event.data.connect.dest = info->dest;
1419 	event.data.connect.sender = info->sender;
1420 
1421 	return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1422 }
1423 
1424 
1425 /*
1426  * add to port's subscription list IOCTL interface
1427  */
snd_seq_ioctl_subscribe_port(struct snd_seq_client * client,void __user * arg)1428 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1429 					void __user *arg)
1430 {
1431 	int result = -EINVAL;
1432 	struct snd_seq_client *receiver = NULL, *sender = NULL;
1433 	struct snd_seq_client_port *sport = NULL, *dport = NULL;
1434 	struct snd_seq_port_subscribe subs;
1435 
1436 	if (copy_from_user(&subs, arg, sizeof(subs)))
1437 		return -EFAULT;
1438 
1439 	if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1440 		goto __end;
1441 	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1442 		goto __end;
1443 	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1444 		goto __end;
1445 	if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1446 		goto __end;
1447 
1448 	result = check_subscription_permission(client, sport, dport, &subs);
1449 	if (result < 0)
1450 		goto __end;
1451 
1452 	/* connect them */
1453 	result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1454 	if (! result) /* broadcast announce */
1455 		snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1456 						   &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1457       __end:
1458       	if (sport)
1459 		snd_seq_port_unlock(sport);
1460 	if (dport)
1461 		snd_seq_port_unlock(dport);
1462 	if (sender)
1463 		snd_seq_client_unlock(sender);
1464 	if (receiver)
1465 		snd_seq_client_unlock(receiver);
1466 	return result;
1467 }
1468 
1469 
1470 /*
1471  * remove from port's subscription list
1472  */
snd_seq_ioctl_unsubscribe_port(struct snd_seq_client * client,void __user * arg)1473 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1474 					  void __user *arg)
1475 {
1476 	int result = -ENXIO;
1477 	struct snd_seq_client *receiver = NULL, *sender = NULL;
1478 	struct snd_seq_client_port *sport = NULL, *dport = NULL;
1479 	struct snd_seq_port_subscribe subs;
1480 
1481 	if (copy_from_user(&subs, arg, sizeof(subs)))
1482 		return -EFAULT;
1483 
1484 	if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1485 		goto __end;
1486 	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1487 		goto __end;
1488 	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1489 		goto __end;
1490 	if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1491 		goto __end;
1492 
1493 	result = check_subscription_permission(client, sport, dport, &subs);
1494 	if (result < 0)
1495 		goto __end;
1496 
1497 	result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1498 	if (! result) /* broadcast announce */
1499 		snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1500 						   &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1501       __end:
1502       	if (sport)
1503 		snd_seq_port_unlock(sport);
1504 	if (dport)
1505 		snd_seq_port_unlock(dport);
1506 	if (sender)
1507 		snd_seq_client_unlock(sender);
1508 	if (receiver)
1509 		snd_seq_client_unlock(receiver);
1510 	return result;
1511 }
1512 
1513 
1514 /* CREATE_QUEUE ioctl() */
snd_seq_ioctl_create_queue(struct snd_seq_client * client,void __user * arg)1515 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1516 				      void __user *arg)
1517 {
1518 	struct snd_seq_queue_info info;
1519 	int result;
1520 	struct snd_seq_queue *q;
1521 
1522 	if (copy_from_user(&info, arg, sizeof(info)))
1523 		return -EFAULT;
1524 
1525 	result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1526 	if (result < 0)
1527 		return result;
1528 
1529 	q = queueptr(result);
1530 	if (q == NULL)
1531 		return -EINVAL;
1532 
1533 	info.queue = q->queue;
1534 	info.locked = q->locked;
1535 	info.owner = q->owner;
1536 
1537 	/* set queue name */
1538 	if (! info.name[0])
1539 		snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1540 	strlcpy(q->name, info.name, sizeof(q->name));
1541 	queuefree(q);
1542 
1543 	if (copy_to_user(arg, &info, sizeof(info)))
1544 		return -EFAULT;
1545 
1546 	return 0;
1547 }
1548 
1549 /* DELETE_QUEUE ioctl() */
snd_seq_ioctl_delete_queue(struct snd_seq_client * client,void __user * arg)1550 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1551 				      void __user *arg)
1552 {
1553 	struct snd_seq_queue_info info;
1554 
1555 	if (copy_from_user(&info, arg, sizeof(info)))
1556 		return -EFAULT;
1557 
1558 	return snd_seq_queue_delete(client->number, info.queue);
1559 }
1560 
1561 /* GET_QUEUE_INFO ioctl() */
snd_seq_ioctl_get_queue_info(struct snd_seq_client * client,void __user * arg)1562 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1563 					void __user *arg)
1564 {
1565 	struct snd_seq_queue_info info;
1566 	struct snd_seq_queue *q;
1567 
1568 	if (copy_from_user(&info, arg, sizeof(info)))
1569 		return -EFAULT;
1570 
1571 	q = queueptr(info.queue);
1572 	if (q == NULL)
1573 		return -EINVAL;
1574 
1575 	memset(&info, 0, sizeof(info));
1576 	info.queue = q->queue;
1577 	info.owner = q->owner;
1578 	info.locked = q->locked;
1579 	strlcpy(info.name, q->name, sizeof(info.name));
1580 	queuefree(q);
1581 
1582 	if (copy_to_user(arg, &info, sizeof(info)))
1583 		return -EFAULT;
1584 
1585 	return 0;
1586 }
1587 
1588 /* SET_QUEUE_INFO ioctl() */
snd_seq_ioctl_set_queue_info(struct snd_seq_client * client,void __user * arg)1589 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1590 					void __user *arg)
1591 {
1592 	struct snd_seq_queue_info info;
1593 	struct snd_seq_queue *q;
1594 
1595 	if (copy_from_user(&info, arg, sizeof(info)))
1596 		return -EFAULT;
1597 
1598 	if (info.owner != client->number)
1599 		return -EINVAL;
1600 
1601 	/* change owner/locked permission */
1602 	if (snd_seq_queue_check_access(info.queue, client->number)) {
1603 		if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1604 			return -EPERM;
1605 		if (info.locked)
1606 			snd_seq_queue_use(info.queue, client->number, 1);
1607 	} else {
1608 		return -EPERM;
1609 	}
1610 
1611 	q = queueptr(info.queue);
1612 	if (! q)
1613 		return -EINVAL;
1614 	if (q->owner != client->number) {
1615 		queuefree(q);
1616 		return -EPERM;
1617 	}
1618 	strlcpy(q->name, info.name, sizeof(q->name));
1619 	queuefree(q);
1620 
1621 	return 0;
1622 }
1623 
1624 /* GET_NAMED_QUEUE ioctl() */
snd_seq_ioctl_get_named_queue(struct snd_seq_client * client,void __user * arg)1625 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1626 {
1627 	struct snd_seq_queue_info info;
1628 	struct snd_seq_queue *q;
1629 
1630 	if (copy_from_user(&info, arg, sizeof(info)))
1631 		return -EFAULT;
1632 
1633 	q = snd_seq_queue_find_name(info.name);
1634 	if (q == NULL)
1635 		return -EINVAL;
1636 	info.queue = q->queue;
1637 	info.owner = q->owner;
1638 	info.locked = q->locked;
1639 	queuefree(q);
1640 
1641 	if (copy_to_user(arg, &info, sizeof(info)))
1642 		return -EFAULT;
1643 
1644 	return 0;
1645 }
1646 
1647 /* GET_QUEUE_STATUS ioctl() */
snd_seq_ioctl_get_queue_status(struct snd_seq_client * client,void __user * arg)1648 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1649 					  void __user *arg)
1650 {
1651 	struct snd_seq_queue_status status;
1652 	struct snd_seq_queue *queue;
1653 	struct snd_seq_timer *tmr;
1654 
1655 	if (copy_from_user(&status, arg, sizeof(status)))
1656 		return -EFAULT;
1657 
1658 	queue = queueptr(status.queue);
1659 	if (queue == NULL)
1660 		return -EINVAL;
1661 	memset(&status, 0, sizeof(status));
1662 	status.queue = queue->queue;
1663 
1664 	tmr = queue->timer;
1665 	status.events = queue->tickq->cells + queue->timeq->cells;
1666 
1667 	status.time = snd_seq_timer_get_cur_time(tmr);
1668 	status.tick = snd_seq_timer_get_cur_tick(tmr);
1669 
1670 	status.running = tmr->running;
1671 
1672 	status.flags = queue->flags;
1673 	queuefree(queue);
1674 
1675 	if (copy_to_user(arg, &status, sizeof(status)))
1676 		return -EFAULT;
1677 	return 0;
1678 }
1679 
1680 
1681 /* GET_QUEUE_TEMPO ioctl() */
snd_seq_ioctl_get_queue_tempo(struct snd_seq_client * client,void __user * arg)1682 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1683 					 void __user *arg)
1684 {
1685 	struct snd_seq_queue_tempo tempo;
1686 	struct snd_seq_queue *queue;
1687 	struct snd_seq_timer *tmr;
1688 
1689 	if (copy_from_user(&tempo, arg, sizeof(tempo)))
1690 		return -EFAULT;
1691 
1692 	queue = queueptr(tempo.queue);
1693 	if (queue == NULL)
1694 		return -EINVAL;
1695 	memset(&tempo, 0, sizeof(tempo));
1696 	tempo.queue = queue->queue;
1697 
1698 	tmr = queue->timer;
1699 
1700 	tempo.tempo = tmr->tempo;
1701 	tempo.ppq = tmr->ppq;
1702 	tempo.skew_value = tmr->skew;
1703 	tempo.skew_base = tmr->skew_base;
1704 	queuefree(queue);
1705 
1706 	if (copy_to_user(arg, &tempo, sizeof(tempo)))
1707 		return -EFAULT;
1708 	return 0;
1709 }
1710 
1711 
1712 /* SET_QUEUE_TEMPO ioctl() */
snd_seq_set_queue_tempo(int client,struct snd_seq_queue_tempo * tempo)1713 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1714 {
1715 	if (!snd_seq_queue_check_access(tempo->queue, client))
1716 		return -EPERM;
1717 	return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1718 }
1719 
1720 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1721 
snd_seq_ioctl_set_queue_tempo(struct snd_seq_client * client,void __user * arg)1722 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1723 					 void __user *arg)
1724 {
1725 	int result;
1726 	struct snd_seq_queue_tempo tempo;
1727 
1728 	if (copy_from_user(&tempo, arg, sizeof(tempo)))
1729 		return -EFAULT;
1730 
1731 	result = snd_seq_set_queue_tempo(client->number, &tempo);
1732 	return result < 0 ? result : 0;
1733 }
1734 
1735 
1736 /* GET_QUEUE_TIMER ioctl() */
snd_seq_ioctl_get_queue_timer(struct snd_seq_client * client,void __user * arg)1737 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1738 					 void __user *arg)
1739 {
1740 	struct snd_seq_queue_timer timer;
1741 	struct snd_seq_queue *queue;
1742 	struct snd_seq_timer *tmr;
1743 
1744 	if (copy_from_user(&timer, arg, sizeof(timer)))
1745 		return -EFAULT;
1746 
1747 	queue = queueptr(timer.queue);
1748 	if (queue == NULL)
1749 		return -EINVAL;
1750 
1751 	if (mutex_lock_interruptible(&queue->timer_mutex)) {
1752 		queuefree(queue);
1753 		return -ERESTARTSYS;
1754 	}
1755 	tmr = queue->timer;
1756 	memset(&timer, 0, sizeof(timer));
1757 	timer.queue = queue->queue;
1758 
1759 	timer.type = tmr->type;
1760 	if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1761 		timer.u.alsa.id = tmr->alsa_id;
1762 		timer.u.alsa.resolution = tmr->preferred_resolution;
1763 	}
1764 	mutex_unlock(&queue->timer_mutex);
1765 	queuefree(queue);
1766 
1767 	if (copy_to_user(arg, &timer, sizeof(timer)))
1768 		return -EFAULT;
1769 	return 0;
1770 }
1771 
1772 
1773 /* SET_QUEUE_TIMER ioctl() */
snd_seq_ioctl_set_queue_timer(struct snd_seq_client * client,void __user * arg)1774 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1775 					 void __user *arg)
1776 {
1777 	int result = 0;
1778 	struct snd_seq_queue_timer timer;
1779 
1780 	if (copy_from_user(&timer, arg, sizeof(timer)))
1781 		return -EFAULT;
1782 
1783 	if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1784 		return -EINVAL;
1785 
1786 	if (snd_seq_queue_check_access(timer.queue, client->number)) {
1787 		struct snd_seq_queue *q;
1788 		struct snd_seq_timer *tmr;
1789 
1790 		q = queueptr(timer.queue);
1791 		if (q == NULL)
1792 			return -ENXIO;
1793 		if (mutex_lock_interruptible(&q->timer_mutex)) {
1794 			queuefree(q);
1795 			return -ERESTARTSYS;
1796 		}
1797 		tmr = q->timer;
1798 		snd_seq_queue_timer_close(timer.queue);
1799 		tmr->type = timer.type;
1800 		if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1801 			tmr->alsa_id = timer.u.alsa.id;
1802 			tmr->preferred_resolution = timer.u.alsa.resolution;
1803 		}
1804 		result = snd_seq_queue_timer_open(timer.queue);
1805 		mutex_unlock(&q->timer_mutex);
1806 		queuefree(q);
1807 	} else {
1808 		return -EPERM;
1809 	}
1810 
1811 	return result;
1812 }
1813 
1814 
1815 /* GET_QUEUE_CLIENT ioctl() */
snd_seq_ioctl_get_queue_client(struct snd_seq_client * client,void __user * arg)1816 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1817 					  void __user *arg)
1818 {
1819 	struct snd_seq_queue_client info;
1820 	int used;
1821 
1822 	if (copy_from_user(&info, arg, sizeof(info)))
1823 		return -EFAULT;
1824 
1825 	used = snd_seq_queue_is_used(info.queue, client->number);
1826 	if (used < 0)
1827 		return -EINVAL;
1828 	info.used = used;
1829 	info.client = client->number;
1830 
1831 	if (copy_to_user(arg, &info, sizeof(info)))
1832 		return -EFAULT;
1833 	return 0;
1834 }
1835 
1836 
1837 /* SET_QUEUE_CLIENT ioctl() */
snd_seq_ioctl_set_queue_client(struct snd_seq_client * client,void __user * arg)1838 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1839 					  void __user *arg)
1840 {
1841 	int err;
1842 	struct snd_seq_queue_client info;
1843 
1844 	if (copy_from_user(&info, arg, sizeof(info)))
1845 		return -EFAULT;
1846 
1847 	if (info.used >= 0) {
1848 		err = snd_seq_queue_use(info.queue, client->number, info.used);
1849 		if (err < 0)
1850 			return err;
1851 	}
1852 
1853 	return snd_seq_ioctl_get_queue_client(client, arg);
1854 }
1855 
1856 
1857 /* GET_CLIENT_POOL ioctl() */
snd_seq_ioctl_get_client_pool(struct snd_seq_client * client,void __user * arg)1858 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1859 					 void __user *arg)
1860 {
1861 	struct snd_seq_client_pool info;
1862 	struct snd_seq_client *cptr;
1863 
1864 	if (copy_from_user(&info, arg, sizeof(info)))
1865 		return -EFAULT;
1866 
1867 	cptr = snd_seq_client_use_ptr(info.client);
1868 	if (cptr == NULL)
1869 		return -ENOENT;
1870 	memset(&info, 0, sizeof(info));
1871 	info.output_pool = cptr->pool->size;
1872 	info.output_room = cptr->pool->room;
1873 	info.output_free = info.output_pool;
1874 	info.output_free = snd_seq_unused_cells(cptr->pool);
1875 	if (cptr->type == USER_CLIENT) {
1876 		info.input_pool = cptr->data.user.fifo_pool_size;
1877 		info.input_free = info.input_pool;
1878 		if (cptr->data.user.fifo)
1879 			info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1880 	} else {
1881 		info.input_pool = 0;
1882 		info.input_free = 0;
1883 	}
1884 	snd_seq_client_unlock(cptr);
1885 
1886 	if (copy_to_user(arg, &info, sizeof(info)))
1887 		return -EFAULT;
1888 	return 0;
1889 }
1890 
1891 /* SET_CLIENT_POOL ioctl() */
snd_seq_ioctl_set_client_pool(struct snd_seq_client * client,void __user * arg)1892 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1893 					 void __user *arg)
1894 {
1895 	struct snd_seq_client_pool info;
1896 	int rc;
1897 
1898 	if (copy_from_user(&info, arg, sizeof(info)))
1899 		return -EFAULT;
1900 
1901 	if (client->number != info.client)
1902 		return -EINVAL; /* can't change other clients */
1903 
1904 	if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1905 	    (! snd_seq_write_pool_allocated(client) ||
1906 	     info.output_pool != client->pool->size)) {
1907 		if (snd_seq_write_pool_allocated(client)) {
1908 			/* remove all existing cells */
1909 			snd_seq_queue_client_leave_cells(client->number);
1910 			snd_seq_pool_done(client->pool);
1911 		}
1912 		client->pool->size = info.output_pool;
1913 		rc = snd_seq_pool_init(client->pool);
1914 		if (rc < 0)
1915 			return rc;
1916 	}
1917 	if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1918 	    info.input_pool >= 1 &&
1919 	    info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1920 	    info.input_pool != client->data.user.fifo_pool_size) {
1921 		/* change pool size */
1922 		rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1923 		if (rc < 0)
1924 			return rc;
1925 		client->data.user.fifo_pool_size = info.input_pool;
1926 	}
1927 	if (info.output_room >= 1 &&
1928 	    info.output_room <= client->pool->size) {
1929 		client->pool->room  = info.output_room;
1930 	}
1931 
1932 	return snd_seq_ioctl_get_client_pool(client, arg);
1933 }
1934 
1935 
1936 /* REMOVE_EVENTS ioctl() */
snd_seq_ioctl_remove_events(struct snd_seq_client * client,void __user * arg)1937 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1938 				       void __user *arg)
1939 {
1940 	struct snd_seq_remove_events info;
1941 
1942 	if (copy_from_user(&info, arg, sizeof(info)))
1943 		return -EFAULT;
1944 
1945 	/*
1946 	 * Input mostly not implemented XXX.
1947 	 */
1948 	if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1949 		/*
1950 		 * No restrictions so for a user client we can clear
1951 		 * the whole fifo
1952 		 */
1953 		if (client->type == USER_CLIENT)
1954 			snd_seq_fifo_clear(client->data.user.fifo);
1955 	}
1956 
1957 	if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1958 		snd_seq_queue_remove_cells(client->number, &info);
1959 
1960 	return 0;
1961 }
1962 
1963 
1964 /*
1965  * get subscription info
1966  */
snd_seq_ioctl_get_subscription(struct snd_seq_client * client,void __user * arg)1967 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1968 					  void __user *arg)
1969 {
1970 	int result;
1971 	struct snd_seq_client *sender = NULL;
1972 	struct snd_seq_client_port *sport = NULL;
1973 	struct snd_seq_port_subscribe subs;
1974 	struct snd_seq_subscribers *p;
1975 
1976 	if (copy_from_user(&subs, arg, sizeof(subs)))
1977 		return -EFAULT;
1978 
1979 	result = -EINVAL;
1980 	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1981 		goto __end;
1982 	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1983 		goto __end;
1984 	p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1985 	if (p) {
1986 		result = 0;
1987 		subs = p->info;
1988 	} else
1989 		result = -ENOENT;
1990 
1991       __end:
1992       	if (sport)
1993 		snd_seq_port_unlock(sport);
1994 	if (sender)
1995 		snd_seq_client_unlock(sender);
1996 	if (result >= 0) {
1997 		if (copy_to_user(arg, &subs, sizeof(subs)))
1998 			return -EFAULT;
1999 	}
2000 	return result;
2001 }
2002 
2003 
2004 /*
2005  * get subscription info - check only its presence
2006  */
snd_seq_ioctl_query_subs(struct snd_seq_client * client,void __user * arg)2007 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2008 				    void __user *arg)
2009 {
2010 	int result = -ENXIO;
2011 	struct snd_seq_client *cptr = NULL;
2012 	struct snd_seq_client_port *port = NULL;
2013 	struct snd_seq_query_subs subs;
2014 	struct snd_seq_port_subs_info *group;
2015 	struct list_head *p;
2016 	int i;
2017 
2018 	if (copy_from_user(&subs, arg, sizeof(subs)))
2019 		return -EFAULT;
2020 
2021 	if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2022 		goto __end;
2023 	if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2024 		goto __end;
2025 
2026 	switch (subs.type) {
2027 	case SNDRV_SEQ_QUERY_SUBS_READ:
2028 		group = &port->c_src;
2029 		break;
2030 	case SNDRV_SEQ_QUERY_SUBS_WRITE:
2031 		group = &port->c_dest;
2032 		break;
2033 	default:
2034 		goto __end;
2035 	}
2036 
2037 	down_read(&group->list_mutex);
2038 	/* search for the subscriber */
2039 	subs.num_subs = group->count;
2040 	i = 0;
2041 	result = -ENOENT;
2042 	list_for_each(p, &group->list_head) {
2043 		if (i++ == subs.index) {
2044 			/* found! */
2045 			struct snd_seq_subscribers *s;
2046 			if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2047 				s = list_entry(p, struct snd_seq_subscribers, src_list);
2048 				subs.addr = s->info.dest;
2049 			} else {
2050 				s = list_entry(p, struct snd_seq_subscribers, dest_list);
2051 				subs.addr = s->info.sender;
2052 			}
2053 			subs.flags = s->info.flags;
2054 			subs.queue = s->info.queue;
2055 			result = 0;
2056 			break;
2057 		}
2058 	}
2059 	up_read(&group->list_mutex);
2060 
2061       __end:
2062    	if (port)
2063 		snd_seq_port_unlock(port);
2064 	if (cptr)
2065 		snd_seq_client_unlock(cptr);
2066 	if (result >= 0) {
2067 		if (copy_to_user(arg, &subs, sizeof(subs)))
2068 			return -EFAULT;
2069 	}
2070 	return result;
2071 }
2072 
2073 
2074 /*
2075  * query next client
2076  */
snd_seq_ioctl_query_next_client(struct snd_seq_client * client,void __user * arg)2077 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2078 					   void __user *arg)
2079 {
2080 	struct snd_seq_client *cptr = NULL;
2081 	struct snd_seq_client_info info;
2082 
2083 	if (copy_from_user(&info, arg, sizeof(info)))
2084 		return -EFAULT;
2085 
2086 	/* search for next client */
2087 	info.client++;
2088 	if (info.client < 0)
2089 		info.client = 0;
2090 	for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2091 		cptr = snd_seq_client_use_ptr(info.client);
2092 		if (cptr)
2093 			break; /* found */
2094 	}
2095 	if (cptr == NULL)
2096 		return -ENOENT;
2097 
2098 	get_client_info(cptr, &info);
2099 	snd_seq_client_unlock(cptr);
2100 
2101 	if (copy_to_user(arg, &info, sizeof(info)))
2102 		return -EFAULT;
2103 	return 0;
2104 }
2105 
2106 /*
2107  * query next port
2108  */
snd_seq_ioctl_query_next_port(struct snd_seq_client * client,void __user * arg)2109 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2110 					 void __user *arg)
2111 {
2112 	struct snd_seq_client *cptr;
2113 	struct snd_seq_client_port *port = NULL;
2114 	struct snd_seq_port_info info;
2115 
2116 	if (copy_from_user(&info, arg, sizeof(info)))
2117 		return -EFAULT;
2118 	cptr = snd_seq_client_use_ptr(info.addr.client);
2119 	if (cptr == NULL)
2120 		return -ENXIO;
2121 
2122 	/* search for next port */
2123 	info.addr.port++;
2124 	port = snd_seq_port_query_nearest(cptr, &info);
2125 	if (port == NULL) {
2126 		snd_seq_client_unlock(cptr);
2127 		return -ENOENT;
2128 	}
2129 
2130 	/* get port info */
2131 	info.addr = port->addr;
2132 	snd_seq_get_port_info(port, &info);
2133 	snd_seq_port_unlock(port);
2134 	snd_seq_client_unlock(cptr);
2135 
2136 	if (copy_to_user(arg, &info, sizeof(info)))
2137 		return -EFAULT;
2138 	return 0;
2139 }
2140 
2141 /* -------------------------------------------------------- */
2142 
2143 static struct seq_ioctl_table {
2144 	unsigned int cmd;
2145 	int (*func)(struct snd_seq_client *client, void __user * arg);
2146 } ioctl_tables[] = {
2147 	{ SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2148 	{ SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2149 	{ SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2150 	{ SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2151 	{ SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2152 	{ SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2153 	{ SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2154 	{ SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2155 	{ SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2156 	{ SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2157 	{ SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2158 	{ SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2159 	{ SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2160 	{ SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2161 	{ SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2162 	{ SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2163 	{ SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2164 	{ SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2165 	{ SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2166 	{ SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2167 	{ SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2168 	{ SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2169 	{ SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2170 	{ SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2171 	{ SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2172 	{ SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2173 	{ SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2174 	{ SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2175 	{ SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2176 	{ 0, NULL },
2177 };
2178 
snd_seq_do_ioctl(struct snd_seq_client * client,unsigned int cmd,void __user * arg)2179 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2180 			    void __user *arg)
2181 {
2182 	struct seq_ioctl_table *p;
2183 
2184 	switch (cmd) {
2185 	case SNDRV_SEQ_IOCTL_PVERSION:
2186 		/* return sequencer version number */
2187 		return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2188 	case SNDRV_SEQ_IOCTL_CLIENT_ID:
2189 		/* return the id of this client */
2190 		return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2191 	}
2192 
2193 	if (! arg)
2194 		return -EFAULT;
2195 	for (p = ioctl_tables; p->cmd; p++) {
2196 		if (p->cmd == cmd)
2197 			return p->func(client, arg);
2198 	}
2199 	snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2200 		   cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2201 	return -ENOTTY;
2202 }
2203 
2204 
snd_seq_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2205 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2206 {
2207 	struct snd_seq_client *client = file->private_data;
2208 
2209 	if (snd_BUG_ON(!client))
2210 		return -ENXIO;
2211 
2212 	return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2213 }
2214 
2215 #ifdef CONFIG_COMPAT
2216 #include "seq_compat.c"
2217 #else
2218 #define snd_seq_ioctl_compat	NULL
2219 #endif
2220 
2221 /* -------------------------------------------------------- */
2222 
2223 
2224 /* exported to kernel modules */
snd_seq_create_kernel_client(struct snd_card * card,int client_index,const char * name_fmt,...)2225 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2226 				 const char *name_fmt, ...)
2227 {
2228 	struct snd_seq_client *client;
2229 	va_list args;
2230 
2231 	if (snd_BUG_ON(in_interrupt()))
2232 		return -EBUSY;
2233 
2234 	if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2235 		return -EINVAL;
2236 	if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2237 		return -EINVAL;
2238 
2239 	if (mutex_lock_interruptible(&register_mutex))
2240 		return -ERESTARTSYS;
2241 
2242 	if (card) {
2243 		client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2244 			+ card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2245 		if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2246 			client_index = -1;
2247 	}
2248 
2249 	/* empty write queue as default */
2250 	client = seq_create_client1(client_index, 0);
2251 	if (client == NULL) {
2252 		mutex_unlock(&register_mutex);
2253 		return -EBUSY;	/* failure code */
2254 	}
2255 	usage_alloc(&client_usage, 1);
2256 
2257 	client->accept_input = 1;
2258 	client->accept_output = 1;
2259 
2260 	va_start(args, name_fmt);
2261 	vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2262 	va_end(args);
2263 
2264 	client->type = KERNEL_CLIENT;
2265 	mutex_unlock(&register_mutex);
2266 
2267 	/* make others aware this new client */
2268 	snd_seq_system_client_ev_client_start(client->number);
2269 
2270 	/* return client number to caller */
2271 	return client->number;
2272 }
2273 
2274 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2275 
2276 /* exported to kernel modules */
snd_seq_delete_kernel_client(int client)2277 int snd_seq_delete_kernel_client(int client)
2278 {
2279 	struct snd_seq_client *ptr;
2280 
2281 	if (snd_BUG_ON(in_interrupt()))
2282 		return -EBUSY;
2283 
2284 	ptr = clientptr(client);
2285 	if (ptr == NULL)
2286 		return -EINVAL;
2287 
2288 	seq_free_client(ptr);
2289 	kfree(ptr);
2290 	return 0;
2291 }
2292 
2293 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2294 
2295 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2296  * and snd_seq_kernel_client_enqueue_blocking
2297  */
kernel_client_enqueue(int client,struct snd_seq_event * ev,struct file * file,int blocking,int atomic,int hop)2298 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2299 				 struct file *file, int blocking,
2300 				 int atomic, int hop)
2301 {
2302 	struct snd_seq_client *cptr;
2303 	int result;
2304 
2305 	if (snd_BUG_ON(!ev))
2306 		return -EINVAL;
2307 
2308 	if (ev->type == SNDRV_SEQ_EVENT_NONE)
2309 		return 0; /* ignore this */
2310 	if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2311 		return -EINVAL; /* quoted events can't be enqueued */
2312 
2313 	/* fill in client number */
2314 	ev->source.client = client;
2315 
2316 	if (check_event_type_and_length(ev))
2317 		return -EINVAL;
2318 
2319 	cptr = snd_seq_client_use_ptr(client);
2320 	if (cptr == NULL)
2321 		return -EINVAL;
2322 
2323 	if (! cptr->accept_output)
2324 		result = -EPERM;
2325 	else /* send it */
2326 		result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2327 
2328 	snd_seq_client_unlock(cptr);
2329 	return result;
2330 }
2331 
2332 /*
2333  * exported, called by kernel clients to enqueue events (w/o blocking)
2334  *
2335  * RETURN VALUE: zero if succeed, negative if error
2336  */
snd_seq_kernel_client_enqueue(int client,struct snd_seq_event * ev,int atomic,int hop)2337 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2338 				  int atomic, int hop)
2339 {
2340 	return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2341 }
2342 
2343 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2344 
2345 /*
2346  * exported, called by kernel clients to enqueue events (with blocking)
2347  *
2348  * RETURN VALUE: zero if succeed, negative if error
2349  */
snd_seq_kernel_client_enqueue_blocking(int client,struct snd_seq_event * ev,struct file * file,int atomic,int hop)2350 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2351 					   struct file *file,
2352 					   int atomic, int hop)
2353 {
2354 	return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2355 }
2356 
2357 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2358 
2359 /*
2360  * exported, called by kernel clients to dispatch events directly to other
2361  * clients, bypassing the queues.  Event time-stamp will be updated.
2362  *
2363  * RETURN VALUE: negative = delivery failed,
2364  *		 zero, or positive: the number of delivered events
2365  */
snd_seq_kernel_client_dispatch(int client,struct snd_seq_event * ev,int atomic,int hop)2366 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2367 				   int atomic, int hop)
2368 {
2369 	struct snd_seq_client *cptr;
2370 	int result;
2371 
2372 	if (snd_BUG_ON(!ev))
2373 		return -EINVAL;
2374 
2375 	/* fill in client number */
2376 	ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2377 	ev->source.client = client;
2378 
2379 	if (check_event_type_and_length(ev))
2380 		return -EINVAL;
2381 
2382 	cptr = snd_seq_client_use_ptr(client);
2383 	if (cptr == NULL)
2384 		return -EINVAL;
2385 
2386 	if (!cptr->accept_output)
2387 		result = -EPERM;
2388 	else
2389 		result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2390 
2391 	snd_seq_client_unlock(cptr);
2392 	return result;
2393 }
2394 
2395 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2396 
2397 /*
2398  * exported, called by kernel clients to perform same functions as with
2399  * userland ioctl()
2400  */
snd_seq_kernel_client_ctl(int clientid,unsigned int cmd,void * arg)2401 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2402 {
2403 	struct snd_seq_client *client;
2404 	mm_segment_t fs;
2405 	int result;
2406 
2407 	client = clientptr(clientid);
2408 	if (client == NULL)
2409 		return -ENXIO;
2410 	fs = snd_enter_user();
2411 	result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2412 	snd_leave_user(fs);
2413 	return result;
2414 }
2415 
2416 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2417 
2418 /* exported (for OSS emulator) */
snd_seq_kernel_client_write_poll(int clientid,struct file * file,poll_table * wait)2419 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2420 {
2421 	struct snd_seq_client *client;
2422 
2423 	client = clientptr(clientid);
2424 	if (client == NULL)
2425 		return -ENXIO;
2426 
2427 	if (! snd_seq_write_pool_allocated(client))
2428 		return 1;
2429 	if (snd_seq_pool_poll_wait(client->pool, file, wait))
2430 		return 1;
2431 	return 0;
2432 }
2433 
2434 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2435 
2436 /*---------------------------------------------------------------------------*/
2437 
2438 #ifdef CONFIG_PROC_FS
2439 /*
2440  *  /proc interface
2441  */
snd_seq_info_dump_subscribers(struct snd_info_buffer * buffer,struct snd_seq_port_subs_info * group,int is_src,char * msg)2442 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2443 					  struct snd_seq_port_subs_info *group,
2444 					  int is_src, char *msg)
2445 {
2446 	struct list_head *p;
2447 	struct snd_seq_subscribers *s;
2448 	int count = 0;
2449 
2450 	down_read(&group->list_mutex);
2451 	if (list_empty(&group->list_head)) {
2452 		up_read(&group->list_mutex);
2453 		return;
2454 	}
2455 	snd_iprintf(buffer, msg);
2456 	list_for_each(p, &group->list_head) {
2457 		if (is_src)
2458 			s = list_entry(p, struct snd_seq_subscribers, src_list);
2459 		else
2460 			s = list_entry(p, struct snd_seq_subscribers, dest_list);
2461 		if (count++)
2462 			snd_iprintf(buffer, ", ");
2463 		snd_iprintf(buffer, "%d:%d",
2464 			    is_src ? s->info.dest.client : s->info.sender.client,
2465 			    is_src ? s->info.dest.port : s->info.sender.port);
2466 		if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2467 			snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2468 		if (group->exclusive)
2469 			snd_iprintf(buffer, "[ex]");
2470 	}
2471 	up_read(&group->list_mutex);
2472 	snd_iprintf(buffer, "\n");
2473 }
2474 
2475 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2476 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2477 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2478 
2479 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2480 
snd_seq_info_dump_ports(struct snd_info_buffer * buffer,struct snd_seq_client * client)2481 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2482 				    struct snd_seq_client *client)
2483 {
2484 	struct snd_seq_client_port *p;
2485 
2486 	mutex_lock(&client->ports_mutex);
2487 	list_for_each_entry(p, &client->ports_list_head, list) {
2488 		snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2489 			    p->addr.port, p->name,
2490 			    FLAG_PERM_RD(p->capability),
2491 			    FLAG_PERM_WR(p->capability),
2492 			    FLAG_PERM_EX(p->capability),
2493 			    FLAG_PERM_DUPLEX(p->capability));
2494 		snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2495 		snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2496 	}
2497 	mutex_unlock(&client->ports_mutex);
2498 }
2499 
2500 
2501 /* exported to seq_info.c */
snd_seq_info_clients_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2502 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2503 			       struct snd_info_buffer *buffer)
2504 {
2505 	int c;
2506 	struct snd_seq_client *client;
2507 
2508 	snd_iprintf(buffer, "Client info\n");
2509 	snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2510 	snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2511 	snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2512 	snd_iprintf(buffer, "\n");
2513 
2514 	/* list the client table */
2515 	for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2516 		client = snd_seq_client_use_ptr(c);
2517 		if (client == NULL)
2518 			continue;
2519 		if (client->type == NO_CLIENT) {
2520 			snd_seq_client_unlock(client);
2521 			continue;
2522 		}
2523 
2524 		snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2525 			    c, client->name,
2526 			    client->type == USER_CLIENT ? "User" : "Kernel");
2527 		snd_seq_info_dump_ports(buffer, client);
2528 		if (snd_seq_write_pool_allocated(client)) {
2529 			snd_iprintf(buffer, "  Output pool :\n");
2530 			snd_seq_info_pool(buffer, client->pool, "    ");
2531 		}
2532 		if (client->type == USER_CLIENT && client->data.user.fifo &&
2533 		    client->data.user.fifo->pool) {
2534 			snd_iprintf(buffer, "  Input pool :\n");
2535 			snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2536 		}
2537 		snd_seq_client_unlock(client);
2538 	}
2539 }
2540 #endif /* CONFIG_PROC_FS */
2541 
2542 /*---------------------------------------------------------------------------*/
2543 
2544 
2545 /*
2546  *  REGISTRATION PART
2547  */
2548 
2549 static const struct file_operations snd_seq_f_ops =
2550 {
2551 	.owner =	THIS_MODULE,
2552 	.read =		snd_seq_read,
2553 	.write =	snd_seq_write,
2554 	.open =		snd_seq_open,
2555 	.release =	snd_seq_release,
2556 	.llseek =	no_llseek,
2557 	.poll =		snd_seq_poll,
2558 	.unlocked_ioctl =	snd_seq_ioctl,
2559 	.compat_ioctl =	snd_seq_ioctl_compat,
2560 };
2561 
2562 /*
2563  * register sequencer device
2564  */
snd_sequencer_device_init(void)2565 int __init snd_sequencer_device_init(void)
2566 {
2567 	int err;
2568 
2569 	if (mutex_lock_interruptible(&register_mutex))
2570 		return -ERESTARTSYS;
2571 
2572 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2573 				       &snd_seq_f_ops, NULL, "seq")) < 0) {
2574 		mutex_unlock(&register_mutex);
2575 		return err;
2576 	}
2577 
2578 	mutex_unlock(&register_mutex);
2579 
2580 	return 0;
2581 }
2582 
2583 
2584 
2585 /*
2586  * unregister sequencer device
2587  */
snd_sequencer_device_done(void)2588 void __exit snd_sequencer_device_done(void)
2589 {
2590 	snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2591 }
2592