~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/sound/core/seq/seq_clientmgr.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  ALSA sequencer Client Manager
  4  *  Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
  5  *                             Jaroslav Kysela <perex@perex.cz>
  6  *                             Takashi Iwai <tiwai@suse.de>
  7  */
  8 
  9 #include <linux/init.h>
 10 #include <linux/export.h>
 11 #include <linux/slab.h>
 12 #include <sound/core.h>
 13 #include <sound/minors.h>
 14 #include <linux/kmod.h>
 15 
 16 #include <sound/seq_kernel.h>
 17 #include "seq_clientmgr.h"
 18 #include "seq_memory.h"
 19 #include "seq_queue.h"
 20 #include "seq_timer.h"
 21 #include "seq_info.h"
 22 #include "seq_system.h"
 23 #include <sound/seq_device.h>
 24 #ifdef CONFIG_COMPAT
 25 #include <linux/compat.h>
 26 #endif
 27 
 28 /* Client Manager
 29 
 30  * this module handles the connections of userland and kernel clients
 31  * 
 32  */
 33 
 34 /*
 35  * There are four ranges of client numbers (last two shared):
 36  * 0..15: global clients
 37  * 16..127: statically allocated client numbers for cards 0..27
 38  * 128..191: dynamically allocated client numbers for cards 28..31
 39  * 128..191: dynamically allocated client numbers for applications
 40  */
 41 
 42 /* number of kernel non-card clients */
 43 #define SNDRV_SEQ_GLOBAL_CLIENTS        16
 44 /* clients per cards, for static clients */
 45 #define SNDRV_SEQ_CLIENTS_PER_CARD      4
 46 /* dynamically allocated client numbers (both kernel drivers and user space) */
 47 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
 48 
 49 #define SNDRV_SEQ_LFLG_INPUT    0x0001
 50 #define SNDRV_SEQ_LFLG_OUTPUT   0x0002
 51 #define SNDRV_SEQ_LFLG_OPEN     (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
 52 
 53 static DEFINE_SPINLOCK(clients_lock);
 54 static DEFINE_MUTEX(register_mutex);
 55 
 56 /*
 57  * client table
 58  */
 59 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
 60 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
 61 static struct snd_seq_usage client_usage;
 62 
 63 /*
 64  * prototypes
 65  */
 66 static int bounce_error_event(struct snd_seq_client *client,
 67                               struct snd_seq_event *event,
 68                               int err, int atomic, int hop);
 69 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
 70                                         struct snd_seq_event *event,
 71                                         int filter, int atomic, int hop);
 72 
 73 /*
 74  */
 75 static inline unsigned short snd_seq_file_flags(struct file *file)
 76 {
 77         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
 78         case FMODE_WRITE:
 79                 return SNDRV_SEQ_LFLG_OUTPUT;
 80         case FMODE_READ:
 81                 return SNDRV_SEQ_LFLG_INPUT;
 82         default:
 83                 return SNDRV_SEQ_LFLG_OPEN;
 84         }
 85 }
 86 
 87 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
 88 {
 89         return snd_seq_total_cells(client->pool) > 0;
 90 }
 91 
 92 /* return pointer to client structure for specified id */
 93 static struct snd_seq_client *clientptr(int clientid)
 94 {
 95         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
 96                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
 97                            clientid);
 98                 return NULL;
 99         }
100         return clienttab[clientid];
101 }
102 
103 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
104 {
105         unsigned long flags;
106         struct snd_seq_client *client;
107 
108         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
109                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
110                            clientid);
111                 return NULL;
112         }
113         spin_lock_irqsave(&clients_lock, flags);
114         client = clientptr(clientid);
115         if (client)
116                 goto __lock;
117         if (clienttablock[clientid]) {
118                 spin_unlock_irqrestore(&clients_lock, flags);
119                 return NULL;
120         }
121         spin_unlock_irqrestore(&clients_lock, flags);
122 #ifdef CONFIG_MODULES
123         if (!in_interrupt()) {
124                 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
125                 static char card_requested[SNDRV_CARDS];
126                 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
127                         int idx;
128                         
129                         if (!client_requested[clientid]) {
130                                 client_requested[clientid] = 1;
131                                 for (idx = 0; idx < 15; idx++) {
132                                         if (seq_client_load[idx] < 0)
133                                                 break;
134                                         if (seq_client_load[idx] == clientid) {
135                                                 request_module("snd-seq-client-%i",
136                                                                clientid);
137                                                 break;
138                                         }
139                                 }
140                         }
141                 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
142                         int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
143                                 SNDRV_SEQ_CLIENTS_PER_CARD;
144                         if (card < snd_ecards_limit) {
145                                 if (! card_requested[card]) {
146                                         card_requested[card] = 1;
147                                         snd_request_card(card);
148                                 }
149                                 snd_seq_device_load_drivers();
150                         }
151                 }
152                 spin_lock_irqsave(&clients_lock, flags);
153                 client = clientptr(clientid);
154                 if (client)
155                         goto __lock;
156                 spin_unlock_irqrestore(&clients_lock, flags);
157         }
158 #endif
159         return NULL;
160 
161       __lock:
162         snd_use_lock_use(&client->use_lock);
163         spin_unlock_irqrestore(&clients_lock, flags);
164         return client;
165 }
166 
167 /* Take refcount and perform ioctl_mutex lock on the given client;
168  * used only for OSS sequencer
169  * Unlock via snd_seq_client_ioctl_unlock() below
170  */
171 bool snd_seq_client_ioctl_lock(int clientid)
172 {
173         struct snd_seq_client *client;
174 
175         client = snd_seq_client_use_ptr(clientid);
176         if (!client)
177                 return false;
178         mutex_lock(&client->ioctl_mutex);
179         /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */
180         return true;
181 }
182 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock);
183 
184 /* Unlock and unref the given client; for OSS sequencer use only */
185 void snd_seq_client_ioctl_unlock(int clientid)
186 {
187         struct snd_seq_client *client;
188 
189         client = snd_seq_client_use_ptr(clientid);
190         if (WARN_ON(!client))
191                 return;
192         mutex_unlock(&client->ioctl_mutex);
193         /* The doubly unrefs below are intentional; the first one releases the
194          * leftover from snd_seq_client_ioctl_lock() above, and the second one
195          * is for releasing snd_seq_client_use_ptr() in this function
196          */
197         snd_seq_client_unlock(client);
198         snd_seq_client_unlock(client);
199 }
200 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock);
201 
202 static void usage_alloc(struct snd_seq_usage *res, int num)
203 {
204         res->cur += num;
205         if (res->cur > res->peak)
206                 res->peak = res->cur;
207 }
208 
209 static void usage_free(struct snd_seq_usage *res, int num)
210 {
211         res->cur -= num;
212 }
213 
214 /* initialise data structures */
215 int __init client_init_data(void)
216 {
217         /* zap out the client table */
218         memset(&clienttablock, 0, sizeof(clienttablock));
219         memset(&clienttab, 0, sizeof(clienttab));
220         return 0;
221 }
222 
223 
224 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
225 {
226         int c;
227         struct snd_seq_client *client;
228 
229         /* init client data */
230         client = kzalloc(sizeof(*client), GFP_KERNEL);
231         if (client == NULL)
232                 return NULL;
233         client->pool = snd_seq_pool_new(poolsize);
234         if (client->pool == NULL) {
235                 kfree(client);
236                 return NULL;
237         }
238         client->type = NO_CLIENT;
239         snd_use_lock_init(&client->use_lock);
240         rwlock_init(&client->ports_lock);
241         mutex_init(&client->ports_mutex);
242         INIT_LIST_HEAD(&client->ports_list_head);
243         mutex_init(&client->ioctl_mutex);
244 
245         /* find free slot in the client table */
246         spin_lock_irq(&clients_lock);
247         if (client_index < 0) {
248                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
249                      c < SNDRV_SEQ_MAX_CLIENTS;
250                      c++) {
251                         if (clienttab[c] || clienttablock[c])
252                                 continue;
253                         clienttab[client->number = c] = client;
254                         spin_unlock_irq(&clients_lock);
255                         return client;
256                 }
257         } else {
258                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
259                         clienttab[client->number = client_index] = client;
260                         spin_unlock_irq(&clients_lock);
261                         return client;
262                 }
263         }
264         spin_unlock_irq(&clients_lock);
265         snd_seq_pool_delete(&client->pool);
266         kfree(client);
267         return NULL;    /* no free slot found or busy, return failure code */
268 }
269 
270 
271 static int seq_free_client1(struct snd_seq_client *client)
272 {
273         if (!client)
274                 return 0;
275         spin_lock_irq(&clients_lock);
276         clienttablock[client->number] = 1;
277         clienttab[client->number] = NULL;
278         spin_unlock_irq(&clients_lock);
279         snd_seq_delete_all_ports(client);
280         snd_seq_queue_client_leave(client->number);
281         snd_use_lock_sync(&client->use_lock);
282         snd_seq_queue_client_termination(client->number);
283         if (client->pool)
284                 snd_seq_pool_delete(&client->pool);
285         spin_lock_irq(&clients_lock);
286         clienttablock[client->number] = 0;
287         spin_unlock_irq(&clients_lock);
288         return 0;
289 }
290 
291 
292 static void seq_free_client(struct snd_seq_client * client)
293 {
294         mutex_lock(&register_mutex);
295         switch (client->type) {
296         case NO_CLIENT:
297                 pr_warn("ALSA: seq: Trying to free unused client %d\n",
298                         client->number);
299                 break;
300         case USER_CLIENT:
301         case KERNEL_CLIENT:
302                 seq_free_client1(client);
303                 usage_free(&client_usage, 1);
304                 break;
305 
306         default:
307                 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
308                            client->number, client->type);
309         }
310         mutex_unlock(&register_mutex);
311 
312         snd_seq_system_client_ev_client_exit(client->number);
313 }
314 
315 
316 
317 /* -------------------------------------------------------- */
318 
319 /* create a user client */
320 static int snd_seq_open(struct inode *inode, struct file *file)
321 {
322         int c, mode;                    /* client id */
323         struct snd_seq_client *client;
324         struct snd_seq_user_client *user;
325         int err;
326 
327         err = stream_open(inode, file);
328         if (err < 0)
329                 return err;
330 
331         mutex_lock(&register_mutex);
332         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
333         if (!client) {
334                 mutex_unlock(&register_mutex);
335                 return -ENOMEM; /* failure code */
336         }
337 
338         mode = snd_seq_file_flags(file);
339         if (mode & SNDRV_SEQ_LFLG_INPUT)
340                 client->accept_input = 1;
341         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
342                 client->accept_output = 1;
343 
344         user = &client->data.user;
345         user->fifo = NULL;
346         user->fifo_pool_size = 0;
347 
348         if (mode & SNDRV_SEQ_LFLG_INPUT) {
349                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
350                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
351                 if (user->fifo == NULL) {
352                         seq_free_client1(client);
353                         kfree(client);
354                         mutex_unlock(&register_mutex);
355                         return -ENOMEM;
356                 }
357         }
358 
359         usage_alloc(&client_usage, 1);
360         client->type = USER_CLIENT;
361         mutex_unlock(&register_mutex);
362 
363         c = client->number;
364         file->private_data = client;
365 
366         /* fill client data */
367         user->file = file;
368         sprintf(client->name, "Client-%d", c);
369         client->data.user.owner = get_pid(task_pid(current));
370 
371         /* make others aware this new client */
372         snd_seq_system_client_ev_client_start(c);
373 
374         return 0;
375 }
376 
377 /* delete a user client */
378 static int snd_seq_release(struct inode *inode, struct file *file)
379 {
380         struct snd_seq_client *client = file->private_data;
381 
382         if (client) {
383                 seq_free_client(client);
384                 if (client->data.user.fifo)
385                         snd_seq_fifo_delete(&client->data.user.fifo);
386                 put_pid(client->data.user.owner);
387                 kfree(client);
388         }
389 
390         return 0;
391 }
392 
393 
394 /* handle client read() */
395 /* possible error values:
396  *      -ENXIO  invalid client or file open mode
397  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
398  *      -EINVAL no enough user-space buffer to write the whole event
399  *      -EFAULT seg. fault during copy to user space
400  */
401 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
402                             loff_t *offset)
403 {
404         struct snd_seq_client *client = file->private_data;
405         struct snd_seq_fifo *fifo;
406         int err;
407         long result = 0;
408         struct snd_seq_event_cell *cell;
409 
410         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
411                 return -ENXIO;
412 
413         if (!access_ok(buf, count))
414                 return -EFAULT;
415 
416         /* check client structures are in place */
417         if (snd_BUG_ON(!client))
418                 return -ENXIO;
419 
420         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
421                 return -ENXIO;
422 
423         if (atomic_read(&fifo->overflow) > 0) {
424                 /* buffer overflow is detected */
425                 snd_seq_fifo_clear(fifo);
426                 /* return error code */
427                 return -ENOSPC;
428         }
429 
430         cell = NULL;
431         err = 0;
432         snd_seq_fifo_lock(fifo);
433 
434         /* while data available in queue */
435         while (count >= sizeof(struct snd_seq_event)) {
436                 int nonblock;
437 
438                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
439                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
440                         break;
441                 }
442                 if (snd_seq_ev_is_variable(&cell->event)) {
443                         struct snd_seq_event tmpev;
444                         tmpev = cell->event;
445                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
446                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
447                                 err = -EFAULT;
448                                 break;
449                         }
450                         count -= sizeof(struct snd_seq_event);
451                         buf += sizeof(struct snd_seq_event);
452                         err = snd_seq_expand_var_event(&cell->event, count,
453                                                        (char __force *)buf, 0,
454                                                        sizeof(struct snd_seq_event));
455                         if (err < 0)
456                                 break;
457                         result += err;
458                         count -= err;
459                         buf += err;
460                 } else {
461                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
462                                 err = -EFAULT;
463                                 break;
464                         }
465                         count -= sizeof(struct snd_seq_event);
466                         buf += sizeof(struct snd_seq_event);
467                 }
468                 snd_seq_cell_free(cell);
469                 cell = NULL; /* to be sure */
470                 result += sizeof(struct snd_seq_event);
471         }
472 
473         if (err < 0) {
474                 if (cell)
475                         snd_seq_fifo_cell_putback(fifo, cell);
476                 if (err == -EAGAIN && result > 0)
477                         err = 0;
478         }
479         snd_seq_fifo_unlock(fifo);
480 
481         return (err < 0) ? err : result;
482 }
483 
484 
485 /*
486  * check access permission to the port
487  */
488 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
489 {
490         if ((port->capability & flags) != flags)
491                 return 0;
492         return flags;
493 }
494 
495 /*
496  * check if the destination client is available, and return the pointer
497  * if filter is non-zero, client filter bitmap is tested.
498  */
499 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
500                                                     int filter)
501 {
502         struct snd_seq_client *dest;
503 
504         dest = snd_seq_client_use_ptr(event->dest.client);
505         if (dest == NULL)
506                 return NULL;
507         if (! dest->accept_input)
508                 goto __not_avail;
509         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
510             ! test_bit(event->type, dest->event_filter))
511                 goto __not_avail;
512         if (filter && !(dest->filter & filter))
513                 goto __not_avail;
514 
515         return dest; /* ok - accessible */
516 __not_avail:
517         snd_seq_client_unlock(dest);
518         return NULL;
519 }
520 
521 
522 /*
523  * Return the error event.
524  *
525  * If the receiver client is a user client, the original event is
526  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
527  * the original event is also variable length, the external data is
528  * copied after the event record. 
529  * If the receiver client is a kernel client, the original event is
530  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
531  * kmalloc.
532  */
533 static int bounce_error_event(struct snd_seq_client *client,
534                               struct snd_seq_event *event,
535                               int err, int atomic, int hop)
536 {
537         struct snd_seq_event bounce_ev;
538         int result;
539 
540         if (client == NULL ||
541             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
542             ! client->accept_input)
543                 return 0; /* ignored */
544 
545         /* set up quoted error */
546         memset(&bounce_ev, 0, sizeof(bounce_ev));
547         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
548         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
549         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
550         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
551         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
552         bounce_ev.dest.client = client->number;
553         bounce_ev.dest.port = event->source.port;
554         bounce_ev.data.quote.origin = event->dest;
555         bounce_ev.data.quote.event = event;
556         bounce_ev.data.quote.value = -err; /* use positive value */
557         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
558         if (result < 0) {
559                 client->event_lost++;
560                 return result;
561         }
562 
563         return result;
564 }
565 
566 
567 /*
568  * rewrite the time-stamp of the event record with the curren time
569  * of the given queue.
570  * return non-zero if updated.
571  */
572 static int update_timestamp_of_queue(struct snd_seq_event *event,
573                                      int queue, int real_time)
574 {
575         struct snd_seq_queue *q;
576 
577         q = queueptr(queue);
578         if (! q)
579                 return 0;
580         event->queue = queue;
581         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
582         if (real_time) {
583                 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
584                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
585         } else {
586                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
587                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
588         }
589         queuefree(q);
590         return 1;
591 }
592 
593 
594 /*
595  * deliver an event to the specified destination.
596  * if filter is non-zero, client filter bitmap is tested.
597  *
598  *  RETURN VALUE: 0 : if succeeded
599  *               <0 : error
600  */
601 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
602                                         struct snd_seq_event *event,
603                                         int filter, int atomic, int hop)
604 {
605         struct snd_seq_client *dest = NULL;
606         struct snd_seq_client_port *dest_port = NULL;
607         int result = -ENOENT;
608         int direct;
609 
610         direct = snd_seq_ev_is_direct(event);
611 
612         dest = get_event_dest_client(event, filter);
613         if (dest == NULL)
614                 goto __skip;
615         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
616         if (dest_port == NULL)
617                 goto __skip;
618 
619         /* check permission */
620         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
621                 result = -EPERM;
622                 goto __skip;
623         }
624                 
625         if (dest_port->timestamping)
626                 update_timestamp_of_queue(event, dest_port->time_queue,
627                                           dest_port->time_real);
628 
629         switch (dest->type) {
630         case USER_CLIENT:
631                 if (dest->data.user.fifo)
632                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
633                 break;
634 
635         case KERNEL_CLIENT:
636                 if (dest_port->event_input == NULL)
637                         break;
638                 result = dest_port->event_input(event, direct,
639                                                 dest_port->private_data,
640                                                 atomic, hop);
641                 break;
642         default:
643                 break;
644         }
645 
646   __skip:
647         if (dest_port)
648                 snd_seq_port_unlock(dest_port);
649         if (dest)
650                 snd_seq_client_unlock(dest);
651 
652         if (result < 0 && !direct) {
653                 result = bounce_error_event(client, event, result, atomic, hop);
654         }
655         return result;
656 }
657 
658 
659 /*
660  * send the event to all subscribers:
661  */
662 static int deliver_to_subscribers(struct snd_seq_client *client,
663                                   struct snd_seq_event *event,
664                                   int atomic, int hop)
665 {
666         struct snd_seq_subscribers *subs;
667         int err, result = 0, num_ev = 0;
668         struct snd_seq_event event_saved;
669         struct snd_seq_client_port *src_port;
670         struct snd_seq_port_subs_info *grp;
671 
672         src_port = snd_seq_port_use_ptr(client, event->source.port);
673         if (src_port == NULL)
674                 return -EINVAL; /* invalid source port */
675         /* save original event record */
676         event_saved = *event;
677         grp = &src_port->c_src;
678         
679         /* lock list */
680         if (atomic)
681                 read_lock(&grp->list_lock);
682         else
683                 down_read_nested(&grp->list_mutex, hop);
684         list_for_each_entry(subs, &grp->list_head, src_list) {
685                 /* both ports ready? */
686                 if (atomic_read(&subs->ref_count) != 2)
687                         continue;
688                 event->dest = subs->info.dest;
689                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
690                         /* convert time according to flag with subscription */
691                         update_timestamp_of_queue(event, subs->info.queue,
692                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
693                 err = snd_seq_deliver_single_event(client, event,
694                                                    0, atomic, hop);
695                 if (err < 0) {
696                         /* save first error that occurs and continue */
697                         if (!result)
698                                 result = err;
699                         continue;
700                 }
701                 num_ev++;
702                 /* restore original event record */
703                 *event = event_saved;
704         }
705         if (atomic)
706                 read_unlock(&grp->list_lock);
707         else
708                 up_read(&grp->list_mutex);
709         *event = event_saved; /* restore */
710         snd_seq_port_unlock(src_port);
711         return (result < 0) ? result : num_ev;
712 }
713 
714 
715 #ifdef SUPPORT_BROADCAST 
716 /*
717  * broadcast to all ports:
718  */
719 static int port_broadcast_event(struct snd_seq_client *client,
720                                 struct snd_seq_event *event,
721                                 int atomic, int hop)
722 {
723         int num_ev = 0, err, result = 0;
724         struct snd_seq_client *dest_client;
725         struct snd_seq_client_port *port;
726 
727         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
728         if (dest_client == NULL)
729                 return 0; /* no matching destination */
730 
731         read_lock(&dest_client->ports_lock);
732         list_for_each_entry(port, &dest_client->ports_list_head, list) {
733                 event->dest.port = port->addr.port;
734                 /* pass NULL as source client to avoid error bounce */
735                 err = snd_seq_deliver_single_event(NULL, event,
736                                                    SNDRV_SEQ_FILTER_BROADCAST,
737                                                    atomic, hop);
738                 if (err < 0) {
739                         /* save first error that occurs and continue */
740                         if (!result)
741                                 result = err;
742                         continue;
743                 }
744                 num_ev++;
745         }
746         read_unlock(&dest_client->ports_lock);
747         snd_seq_client_unlock(dest_client);
748         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
749         return (result < 0) ? result : num_ev;
750 }
751 
752 /*
753  * send the event to all clients:
754  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
755  */
756 static int broadcast_event(struct snd_seq_client *client,
757                            struct snd_seq_event *event, int atomic, int hop)
758 {
759         int err, result = 0, num_ev = 0;
760         int dest;
761         struct snd_seq_addr addr;
762 
763         addr = event->dest; /* save */
764 
765         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
766                 /* don't send to itself */
767                 if (dest == client->number)
768                         continue;
769                 event->dest.client = dest;
770                 event->dest.port = addr.port;
771                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
772                         err = port_broadcast_event(client, event, atomic, hop);
773                 else
774                         /* pass NULL as source client to avoid error bounce */
775                         err = snd_seq_deliver_single_event(NULL, event,
776                                                            SNDRV_SEQ_FILTER_BROADCAST,
777                                                            atomic, hop);
778                 if (err < 0) {
779                         /* save first error that occurs and continue */
780                         if (!result)
781                                 result = err;
782                         continue;
783                 }
784                 num_ev += err;
785         }
786         event->dest = addr; /* restore */
787         return (result < 0) ? result : num_ev;
788 }
789 
790 
791 /* multicast - not supported yet */
792 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
793                            int atomic, int hop)
794 {
795         pr_debug("ALSA: seq: multicast not supported yet.\n");
796         return 0; /* ignored */
797 }
798 #endif /* SUPPORT_BROADCAST */
799 
800 
801 /* deliver an event to the destination port(s).
802  * if the event is to subscribers or broadcast, the event is dispatched
803  * to multiple targets.
804  *
805  * RETURN VALUE: n > 0  : the number of delivered events.
806  *               n == 0 : the event was not passed to any client.
807  *               n < 0  : error - event was not processed.
808  */
809 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
810                                  int atomic, int hop)
811 {
812         int result;
813 
814         hop++;
815         if (hop >= SNDRV_SEQ_MAX_HOPS) {
816                 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
817                            event->source.client, event->source.port,
818                            event->dest.client, event->dest.port);
819                 return -EMLINK;
820         }
821 
822         if (snd_seq_ev_is_variable(event) &&
823             snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
824                 return -EINVAL;
825 
826         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
827             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
828                 result = deliver_to_subscribers(client, event, atomic, hop);
829 #ifdef SUPPORT_BROADCAST
830         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
831                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
832                 result = broadcast_event(client, event, atomic, hop);
833         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
834                 result = multicast_event(client, event, atomic, hop);
835         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
836                 result = port_broadcast_event(client, event, atomic, hop);
837 #endif
838         else
839                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
840 
841         return result;
842 }
843 
844 /*
845  * dispatch an event cell:
846  * This function is called only from queue check routines in timer
847  * interrupts or after enqueued.
848  * The event cell shall be released or re-queued in this function.
849  *
850  * RETURN VALUE: n > 0  : the number of delivered events.
851  *               n == 0 : the event was not passed to any client.
852  *               n < 0  : error - event was not processed.
853  */
854 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
855 {
856         struct snd_seq_client *client;
857         int result;
858 
859         if (snd_BUG_ON(!cell))
860                 return -EINVAL;
861 
862         client = snd_seq_client_use_ptr(cell->event.source.client);
863         if (client == NULL) {
864                 snd_seq_cell_free(cell); /* release this cell */
865                 return -EINVAL;
866         }
867 
868         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
869                 /* NOTE event:
870                  * the event cell is re-used as a NOTE-OFF event and
871                  * enqueued again.
872                  */
873                 struct snd_seq_event tmpev, *ev;
874 
875                 /* reserve this event to enqueue note-off later */
876                 tmpev = cell->event;
877                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
878                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
879 
880                 /*
881                  * This was originally a note event.  We now re-use the
882                  * cell for the note-off event.
883                  */
884 
885                 ev = &cell->event;
886                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
887                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
888 
889                 /* add the duration time */
890                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
891                 case SNDRV_SEQ_TIME_STAMP_TICK:
892                         ev->time.tick += ev->data.note.duration;
893                         break;
894                 case SNDRV_SEQ_TIME_STAMP_REAL:
895                         /* unit for duration is ms */
896                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
897                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
898                                                 ev->time.time.tv_nsec / 1000000000;
899                         ev->time.time.tv_nsec %= 1000000000;
900                         break;
901                 }
902                 ev->data.note.velocity = ev->data.note.off_velocity;
903 
904                 /* Now queue this cell as the note off event */
905                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
906                         snd_seq_cell_free(cell); /* release this cell */
907 
908         } else {
909                 /* Normal events:
910                  * event cell is freed after processing the event
911                  */
912 
913                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
914                 snd_seq_cell_free(cell);
915         }
916 
917         snd_seq_client_unlock(client);
918         return result;
919 }
920 
921 
922 /* Allocate a cell from client pool and enqueue it to queue:
923  * if pool is empty and blocking is TRUE, sleep until a new cell is
924  * available.
925  */
926 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
927                                         struct snd_seq_event *event,
928                                         struct file *file, int blocking,
929                                         int atomic, int hop,
930                                         struct mutex *mutexp)
931 {
932         struct snd_seq_event_cell *cell;
933         int err;
934 
935         /* special queue values - force direct passing */
936         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
937                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
938                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
939         } else
940 #ifdef SUPPORT_BROADCAST
941                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
942                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
943                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
944                 }
945 #endif
946         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
947                 /* check presence of source port */
948                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
949                 if (src_port == NULL)
950                         return -EINVAL;
951                 snd_seq_port_unlock(src_port);
952         }
953 
954         /* direct event processing without enqueued */
955         if (snd_seq_ev_is_direct(event)) {
956                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
957                         return -EINVAL; /* this event must be enqueued! */
958                 return snd_seq_deliver_event(client, event, atomic, hop);
959         }
960 
961         /* Not direct, normal queuing */
962         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
963                 return -EINVAL;  /* invalid queue */
964         if (! snd_seq_write_pool_allocated(client))
965                 return -ENXIO; /* queue is not allocated */
966 
967         /* allocate an event cell */
968         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
969                                 file, mutexp);
970         if (err < 0)
971                 return err;
972 
973         /* we got a cell. enqueue it. */
974         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
975                 snd_seq_cell_free(cell);
976                 return err;
977         }
978 
979         return 0;
980 }
981 
982 
983 /*
984  * check validity of event type and data length.
985  * return non-zero if invalid.
986  */
987 static int check_event_type_and_length(struct snd_seq_event *ev)
988 {
989         switch (snd_seq_ev_length_type(ev)) {
990         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
991                 if (snd_seq_ev_is_variable_type(ev))
992                         return -EINVAL;
993                 break;
994         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
995                 if (! snd_seq_ev_is_variable_type(ev) ||
996                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
997                         return -EINVAL;
998                 break;
999         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
1000                 if (! snd_seq_ev_is_direct(ev))
1001                         return -EINVAL;
1002                 break;
1003         }
1004         return 0;
1005 }
1006 
1007 
1008 /* handle write() */
1009 /* possible error values:
1010  *      -ENXIO  invalid client or file open mode
1011  *      -ENOMEM malloc failed
1012  *      -EFAULT seg. fault during copy from user space
1013  *      -EINVAL invalid event
1014  *      -EAGAIN no space in output pool
1015  *      -EINTR  interrupts while sleep
1016  *      -EMLINK too many hops
1017  *      others  depends on return value from driver callback
1018  */
1019 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1020                              size_t count, loff_t *offset)
1021 {
1022         struct snd_seq_client *client = file->private_data;
1023         int written = 0, len;
1024         int err, handled;
1025         struct snd_seq_event event;
1026 
1027         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1028                 return -ENXIO;
1029 
1030         /* check client structures are in place */
1031         if (snd_BUG_ON(!client))
1032                 return -ENXIO;
1033                 
1034         if (!client->accept_output || client->pool == NULL)
1035                 return -ENXIO;
1036 
1037  repeat:
1038         handled = 0;
1039         /* allocate the pool now if the pool is not allocated yet */ 
1040         mutex_lock(&client->ioctl_mutex);
1041         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1042                 err = snd_seq_pool_init(client->pool);
1043                 if (err < 0)
1044                         goto out;
1045         }
1046 
1047         /* only process whole events */
1048         err = -EINVAL;
1049         while (count >= sizeof(struct snd_seq_event)) {
1050                 /* Read in the event header from the user */
1051                 len = sizeof(event);
1052                 if (copy_from_user(&event, buf, len)) {
1053                         err = -EFAULT;
1054                         break;
1055                 }
1056                 event.source.client = client->number;   /* fill in client number */
1057                 /* Check for extension data length */
1058                 if (check_event_type_and_length(&event)) {
1059                         err = -EINVAL;
1060                         break;
1061                 }
1062 
1063                 /* check for special events */
1064                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1065                         goto __skip_event;
1066                 else if (snd_seq_ev_is_reserved(&event)) {
1067                         err = -EINVAL;
1068                         break;
1069                 }
1070 
1071                 if (snd_seq_ev_is_variable(&event)) {
1072                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1073                         if ((size_t)(extlen + len) > count) {
1074                                 /* back out, will get an error this time or next */
1075                                 err = -EINVAL;
1076                                 break;
1077                         }
1078                         /* set user space pointer */
1079                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1080                         event.data.ext.ptr = (char __force *)buf
1081                                                 + sizeof(struct snd_seq_event);
1082                         len += extlen; /* increment data length */
1083                 } else {
1084 #ifdef CONFIG_COMPAT
1085                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1086                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1087                                 event.data.ext.ptr = ptr;
1088                         }
1089 #endif
1090                 }
1091 
1092                 /* ok, enqueue it */
1093                 err = snd_seq_client_enqueue_event(client, &event, file,
1094                                                    !(file->f_flags & O_NONBLOCK),
1095                                                    0, 0, &client->ioctl_mutex);
1096                 if (err < 0)
1097                         break;
1098                 handled++;
1099 
1100         __skip_event:
1101                 /* Update pointers and counts */
1102                 count -= len;
1103                 buf += len;
1104                 written += len;
1105 
1106                 /* let's have a coffee break if too many events are queued */
1107                 if (++handled >= 200) {
1108                         mutex_unlock(&client->ioctl_mutex);
1109                         goto repeat;
1110                 }
1111         }
1112 
1113  out:
1114         mutex_unlock(&client->ioctl_mutex);
1115         return written ? written : err;
1116 }
1117 
1118 
1119 /*
1120  * handle polling
1121  */
1122 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1123 {
1124         struct snd_seq_client *client = file->private_data;
1125         __poll_t mask = 0;
1126 
1127         /* check client structures are in place */
1128         if (snd_BUG_ON(!client))
1129                 return EPOLLERR;
1130 
1131         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1132             client->data.user.fifo) {
1133 
1134                 /* check if data is available in the outqueue */
1135                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1136                         mask |= EPOLLIN | EPOLLRDNORM;
1137         }
1138 
1139         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1140 
1141                 /* check if data is available in the pool */
1142                 if (!snd_seq_write_pool_allocated(client) ||
1143                     snd_seq_pool_poll_wait(client->pool, file, wait))
1144                         mask |= EPOLLOUT | EPOLLWRNORM;
1145         }
1146 
1147         return mask;
1148 }
1149 
1150 
1151 /*-----------------------------------------------------*/
1152 
1153 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1154 {
1155         int *pversion = arg;
1156 
1157         *pversion = SNDRV_SEQ_VERSION;
1158         return 0;
1159 }
1160 
1161 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1162 {
1163         int *client_id = arg;
1164 
1165         *client_id = client->number;
1166         return 0;
1167 }
1168 
1169 /* SYSTEM_INFO ioctl() */
1170 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1171 {
1172         struct snd_seq_system_info *info = arg;
1173 
1174         memset(info, 0, sizeof(*info));
1175         /* fill the info fields */
1176         info->queues = SNDRV_SEQ_MAX_QUEUES;
1177         info->clients = SNDRV_SEQ_MAX_CLIENTS;
1178         info->ports = SNDRV_SEQ_MAX_PORTS;
1179         info->channels = 256;   /* fixed limit */
1180         info->cur_clients = client_usage.cur;
1181         info->cur_queues = snd_seq_queue_get_cur_queues();
1182 
1183         return 0;
1184 }
1185 
1186 
1187 /* RUNNING_MODE ioctl() */
1188 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void  *arg)
1189 {
1190         struct snd_seq_running_info *info = arg;
1191         struct snd_seq_client *cptr;
1192         int err = 0;
1193 
1194         /* requested client number */
1195         cptr = snd_seq_client_use_ptr(info->client);
1196         if (cptr == NULL)
1197                 return -ENOENT;         /* don't change !!! */
1198 
1199 #ifdef SNDRV_BIG_ENDIAN
1200         if (!info->big_endian) {
1201                 err = -EINVAL;
1202                 goto __err;
1203         }
1204 #else
1205         if (info->big_endian) {
1206                 err = -EINVAL;
1207                 goto __err;
1208         }
1209 
1210 #endif
1211         if (info->cpu_mode > sizeof(long)) {
1212                 err = -EINVAL;
1213                 goto __err;
1214         }
1215         cptr->convert32 = (info->cpu_mode < sizeof(long));
1216  __err:
1217         snd_seq_client_unlock(cptr);
1218         return err;
1219 }
1220 
1221 /* CLIENT_INFO ioctl() */
1222 static void get_client_info(struct snd_seq_client *cptr,
1223                             struct snd_seq_client_info *info)
1224 {
1225         info->client = cptr->number;
1226 
1227         /* fill the info fields */
1228         info->type = cptr->type;
1229         strcpy(info->name, cptr->name);
1230         info->filter = cptr->filter;
1231         info->event_lost = cptr->event_lost;
1232         memcpy(info->event_filter, cptr->event_filter, 32);
1233         info->num_ports = cptr->num_ports;
1234 
1235         if (cptr->type == USER_CLIENT)
1236                 info->pid = pid_vnr(cptr->data.user.owner);
1237         else
1238                 info->pid = -1;
1239 
1240         if (cptr->type == KERNEL_CLIENT)
1241                 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1242         else
1243                 info->card = -1;
1244 
1245         memset(info->reserved, 0, sizeof(info->reserved));
1246 }
1247 
1248 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1249                                          void *arg)
1250 {
1251         struct snd_seq_client_info *client_info = arg;
1252         struct snd_seq_client *cptr;
1253 
1254         /* requested client number */
1255         cptr = snd_seq_client_use_ptr(client_info->client);
1256         if (cptr == NULL)
1257                 return -ENOENT;         /* don't change !!! */
1258 
1259         get_client_info(cptr, client_info);
1260         snd_seq_client_unlock(cptr);
1261 
1262         return 0;
1263 }
1264 
1265 
1266 /* CLIENT_INFO ioctl() */
1267 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1268                                          void *arg)
1269 {
1270         struct snd_seq_client_info *client_info = arg;
1271 
1272         /* it is not allowed to set the info fields for an another client */
1273         if (client->number != client_info->client)
1274                 return -EPERM;
1275         /* also client type must be set now */
1276         if (client->type != client_info->type)
1277                 return -EINVAL;
1278 
1279         /* fill the info fields */
1280         if (client_info->name[0])
1281                 strscpy(client->name, client_info->name, sizeof(client->name));
1282 
1283         client->filter = client_info->filter;
1284         client->event_lost = client_info->event_lost;
1285         memcpy(client->event_filter, client_info->event_filter, 32);
1286 
1287         return 0;
1288 }
1289 
1290 
1291 /* 
1292  * CREATE PORT ioctl() 
1293  */
1294 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1295 {
1296         struct snd_seq_port_info *info = arg;
1297         struct snd_seq_client_port *port;
1298         struct snd_seq_port_callback *callback;
1299         int port_idx;
1300 
1301         /* it is not allowed to create the port for an another client */
1302         if (info->addr.client != client->number)
1303                 return -EPERM;
1304 
1305         port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1306         if (port == NULL)
1307                 return -ENOMEM;
1308 
1309         if (client->type == USER_CLIENT && info->kernel) {
1310                 port_idx = port->addr.port;
1311                 snd_seq_port_unlock(port);
1312                 snd_seq_delete_port(client, port_idx);
1313                 return -EINVAL;
1314         }
1315         if (client->type == KERNEL_CLIENT) {
1316                 if ((callback = info->kernel) != NULL) {
1317                         if (callback->owner)
1318                                 port->owner = callback->owner;
1319                         port->private_data = callback->private_data;
1320                         port->private_free = callback->private_free;
1321                         port->event_input = callback->event_input;
1322                         port->c_src.open = callback->subscribe;
1323                         port->c_src.close = callback->unsubscribe;
1324                         port->c_dest.open = callback->use;
1325                         port->c_dest.close = callback->unuse;
1326                 }
1327         }
1328 
1329         info->addr = port->addr;
1330 
1331         snd_seq_set_port_info(port, info);
1332         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1333         snd_seq_port_unlock(port);
1334 
1335         return 0;
1336 }
1337 
1338 /* 
1339  * DELETE PORT ioctl() 
1340  */
1341 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1342 {
1343         struct snd_seq_port_info *info = arg;
1344         int err;
1345 
1346         /* it is not allowed to remove the port for an another client */
1347         if (info->addr.client != client->number)
1348                 return -EPERM;
1349 
1350         err = snd_seq_delete_port(client, info->addr.port);
1351         if (err >= 0)
1352                 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1353         return err;
1354 }
1355 
1356 
1357 /* 
1358  * GET_PORT_INFO ioctl() (on any client) 
1359  */
1360 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1361 {
1362         struct snd_seq_port_info *info = arg;
1363         struct snd_seq_client *cptr;
1364         struct snd_seq_client_port *port;
1365 
1366         cptr = snd_seq_client_use_ptr(info->addr.client);
1367         if (cptr == NULL)
1368                 return -ENXIO;
1369 
1370         port = snd_seq_port_use_ptr(cptr, info->addr.port);
1371         if (port == NULL) {
1372                 snd_seq_client_unlock(cptr);
1373                 return -ENOENT;                 /* don't change */
1374         }
1375 
1376         /* get port info */
1377         snd_seq_get_port_info(port, info);
1378         snd_seq_port_unlock(port);
1379         snd_seq_client_unlock(cptr);
1380 
1381         return 0;
1382 }
1383 
1384 
1385 /* 
1386  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1387  */
1388 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1389 {
1390         struct snd_seq_port_info *info = arg;
1391         struct snd_seq_client_port *port;
1392 
1393         if (info->addr.client != client->number) /* only set our own ports ! */
1394                 return -EPERM;
1395         port = snd_seq_port_use_ptr(client, info->addr.port);
1396         if (port) {
1397                 snd_seq_set_port_info(port, info);
1398                 snd_seq_port_unlock(port);
1399         }
1400         return 0;
1401 }
1402 
1403 
1404 /*
1405  * port subscription (connection)
1406  */
1407 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1408 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1409 
1410 static int check_subscription_permission(struct snd_seq_client *client,
1411                                          struct snd_seq_client_port *sport,
1412                                          struct snd_seq_client_port *dport,
1413                                          struct snd_seq_port_subscribe *subs)
1414 {
1415         if (client->number != subs->sender.client &&
1416             client->number != subs->dest.client) {
1417                 /* connection by third client - check export permission */
1418                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1419                         return -EPERM;
1420                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1421                         return -EPERM;
1422         }
1423 
1424         /* check read permission */
1425         /* if sender or receiver is the subscribing client itself,
1426          * no permission check is necessary
1427          */
1428         if (client->number != subs->sender.client) {
1429                 if (! check_port_perm(sport, PERM_RD))
1430                         return -EPERM;
1431         }
1432         /* check write permission */
1433         if (client->number != subs->dest.client) {
1434                 if (! check_port_perm(dport, PERM_WR))
1435                         return -EPERM;
1436         }
1437         return 0;
1438 }
1439 
1440 /*
1441  * send an subscription notify event to user client:
1442  * client must be user client.
1443  */
1444 int snd_seq_client_notify_subscription(int client, int port,
1445                                        struct snd_seq_port_subscribe *info,
1446                                        int evtype)
1447 {
1448         struct snd_seq_event event;
1449 
1450         memset(&event, 0, sizeof(event));
1451         event.type = evtype;
1452         event.data.connect.dest = info->dest;
1453         event.data.connect.sender = info->sender;
1454 
1455         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1456 }
1457 
1458 
1459 /* 
1460  * add to port's subscription list IOCTL interface 
1461  */
1462 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1463                                         void *arg)
1464 {
1465         struct snd_seq_port_subscribe *subs = arg;
1466         int result = -EINVAL;
1467         struct snd_seq_client *receiver = NULL, *sender = NULL;
1468         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1469 
1470         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1471                 goto __end;
1472         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1473                 goto __end;
1474         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1475                 goto __end;
1476         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1477                 goto __end;
1478 
1479         result = check_subscription_permission(client, sport, dport, subs);
1480         if (result < 0)
1481                 goto __end;
1482 
1483         /* connect them */
1484         result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1485         if (! result) /* broadcast announce */
1486                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1487                                                    subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1488       __end:
1489         if (sport)
1490                 snd_seq_port_unlock(sport);
1491         if (dport)
1492                 snd_seq_port_unlock(dport);
1493         if (sender)
1494                 snd_seq_client_unlock(sender);
1495         if (receiver)
1496                 snd_seq_client_unlock(receiver);
1497         return result;
1498 }
1499 
1500 
1501 /* 
1502  * remove from port's subscription list 
1503  */
1504 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1505                                           void *arg)
1506 {
1507         struct snd_seq_port_subscribe *subs = arg;
1508         int result = -ENXIO;
1509         struct snd_seq_client *receiver = NULL, *sender = NULL;
1510         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1511 
1512         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1513                 goto __end;
1514         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1515                 goto __end;
1516         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1517                 goto __end;
1518         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1519                 goto __end;
1520 
1521         result = check_subscription_permission(client, sport, dport, subs);
1522         if (result < 0)
1523                 goto __end;
1524 
1525         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1526         if (! result) /* broadcast announce */
1527                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1528                                                    subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1529       __end:
1530         if (sport)
1531                 snd_seq_port_unlock(sport);
1532         if (dport)
1533                 snd_seq_port_unlock(dport);
1534         if (sender)
1535                 snd_seq_client_unlock(sender);
1536         if (receiver)
1537                 snd_seq_client_unlock(receiver);
1538         return result;
1539 }
1540 
1541 
1542 /* CREATE_QUEUE ioctl() */
1543 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1544 {
1545         struct snd_seq_queue_info *info = arg;
1546         struct snd_seq_queue *q;
1547 
1548         q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1549         if (IS_ERR(q))
1550                 return PTR_ERR(q);
1551 
1552         info->queue = q->queue;
1553         info->locked = q->locked;
1554         info->owner = q->owner;
1555 
1556         /* set queue name */
1557         if (!info->name[0])
1558                 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1559         strscpy(q->name, info->name, sizeof(q->name));
1560         snd_use_lock_free(&q->use_lock);
1561 
1562         return 0;
1563 }
1564 
1565 /* DELETE_QUEUE ioctl() */
1566 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1567 {
1568         struct snd_seq_queue_info *info = arg;
1569 
1570         return snd_seq_queue_delete(client->number, info->queue);
1571 }
1572 
1573 /* GET_QUEUE_INFO ioctl() */
1574 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1575                                         void *arg)
1576 {
1577         struct snd_seq_queue_info *info = arg;
1578         struct snd_seq_queue *q;
1579 
1580         q = queueptr(info->queue);
1581         if (q == NULL)
1582                 return -EINVAL;
1583 
1584         memset(info, 0, sizeof(*info));
1585         info->queue = q->queue;
1586         info->owner = q->owner;
1587         info->locked = q->locked;
1588         strlcpy(info->name, q->name, sizeof(info->name));
1589         queuefree(q);
1590 
1591         return 0;
1592 }
1593 
1594 /* SET_QUEUE_INFO ioctl() */
1595 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1596                                         void *arg)
1597 {
1598         struct snd_seq_queue_info *info = arg;
1599         struct snd_seq_queue *q;
1600 
1601         if (info->owner != client->number)
1602                 return -EINVAL;
1603 
1604         /* change owner/locked permission */
1605         if (snd_seq_queue_check_access(info->queue, client->number)) {
1606                 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1607                         return -EPERM;
1608                 if (info->locked)
1609                         snd_seq_queue_use(info->queue, client->number, 1);
1610         } else {
1611                 return -EPERM;
1612         }       
1613 
1614         q = queueptr(info->queue);
1615         if (! q)
1616                 return -EINVAL;
1617         if (q->owner != client->number) {
1618                 queuefree(q);
1619                 return -EPERM;
1620         }
1621         strscpy(q->name, info->name, sizeof(q->name));
1622         queuefree(q);
1623 
1624         return 0;
1625 }
1626 
1627 /* GET_NAMED_QUEUE ioctl() */
1628 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1629                                          void *arg)
1630 {
1631         struct snd_seq_queue_info *info = arg;
1632         struct snd_seq_queue *q;
1633 
1634         q = snd_seq_queue_find_name(info->name);
1635         if (q == NULL)
1636                 return -EINVAL;
1637         info->queue = q->queue;
1638         info->owner = q->owner;
1639         info->locked = q->locked;
1640         queuefree(q);
1641 
1642         return 0;
1643 }
1644 
1645 /* GET_QUEUE_STATUS ioctl() */
1646 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1647                                           void *arg)
1648 {
1649         struct snd_seq_queue_status *status = arg;
1650         struct snd_seq_queue *queue;
1651         struct snd_seq_timer *tmr;
1652 
1653         queue = queueptr(status->queue);
1654         if (queue == NULL)
1655                 return -EINVAL;
1656         memset(status, 0, sizeof(*status));
1657         status->queue = queue->queue;
1658         
1659         tmr = queue->timer;
1660         status->events = queue->tickq->cells + queue->timeq->cells;
1661 
1662         status->time = snd_seq_timer_get_cur_time(tmr, true);
1663         status->tick = snd_seq_timer_get_cur_tick(tmr);
1664 
1665         status->running = tmr->running;
1666 
1667         status->flags = queue->flags;
1668         queuefree(queue);
1669 
1670         return 0;
1671 }
1672 
1673 
1674 /* GET_QUEUE_TEMPO ioctl() */
1675 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1676                                          void *arg)
1677 {
1678         struct snd_seq_queue_tempo *tempo = arg;
1679         struct snd_seq_queue *queue;
1680         struct snd_seq_timer *tmr;
1681 
1682         queue = queueptr(tempo->queue);
1683         if (queue == NULL)
1684                 return -EINVAL;
1685         memset(tempo, 0, sizeof(*tempo));
1686         tempo->queue = queue->queue;
1687         
1688         tmr = queue->timer;
1689 
1690         tempo->tempo = tmr->tempo;
1691         tempo->ppq = tmr->ppq;
1692         tempo->skew_value = tmr->skew;
1693         tempo->skew_base = tmr->skew_base;
1694         queuefree(queue);
1695 
1696         return 0;
1697 }
1698 
1699 
1700 /* SET_QUEUE_TEMPO ioctl() */
1701 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1702 {
1703         if (!snd_seq_queue_check_access(tempo->queue, client))
1704                 return -EPERM;
1705         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1706 }
1707 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1708 
1709 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1710                                          void *arg)
1711 {
1712         struct snd_seq_queue_tempo *tempo = arg;
1713         int result;
1714 
1715         result = snd_seq_set_queue_tempo(client->number, tempo);
1716         return result < 0 ? result : 0;
1717 }
1718 
1719 
1720 /* GET_QUEUE_TIMER ioctl() */
1721 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1722                                          void *arg)
1723 {
1724         struct snd_seq_queue_timer *timer = arg;
1725         struct snd_seq_queue *queue;
1726         struct snd_seq_timer *tmr;
1727 
1728         queue = queueptr(timer->queue);
1729         if (queue == NULL)
1730                 return -EINVAL;
1731 
1732         mutex_lock(&queue->timer_mutex);
1733         tmr = queue->timer;
1734         memset(timer, 0, sizeof(*timer));
1735         timer->queue = queue->queue;
1736 
1737         timer->type = tmr->type;
1738         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1739                 timer->u.alsa.id = tmr->alsa_id;
1740                 timer->u.alsa.resolution = tmr->preferred_resolution;
1741         }
1742         mutex_unlock(&queue->timer_mutex);
1743         queuefree(queue);
1744         
1745         return 0;
1746 }
1747 
1748 
1749 /* SET_QUEUE_TIMER ioctl() */
1750 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1751                                          void *arg)
1752 {
1753         struct snd_seq_queue_timer *timer = arg;
1754         int result = 0;
1755 
1756         if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1757                 return -EINVAL;
1758 
1759         if (snd_seq_queue_check_access(timer->queue, client->number)) {
1760                 struct snd_seq_queue *q;
1761                 struct snd_seq_timer *tmr;
1762 
1763                 q = queueptr(timer->queue);
1764                 if (q == NULL)
1765                         return -ENXIO;
1766                 mutex_lock(&q->timer_mutex);
1767                 tmr = q->timer;
1768                 snd_seq_queue_timer_close(timer->queue);
1769                 tmr->type = timer->type;
1770                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1771                         tmr->alsa_id = timer->u.alsa.id;
1772                         tmr->preferred_resolution = timer->u.alsa.resolution;
1773                 }
1774                 result = snd_seq_queue_timer_open(timer->queue);
1775                 mutex_unlock(&q->timer_mutex);
1776                 queuefree(q);
1777         } else {
1778                 return -EPERM;
1779         }       
1780 
1781         return result;
1782 }
1783 
1784 
1785 /* GET_QUEUE_CLIENT ioctl() */
1786 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1787                                           void *arg)
1788 {
1789         struct snd_seq_queue_client *info = arg;
1790         int used;
1791 
1792         used = snd_seq_queue_is_used(info->queue, client->number);
1793         if (used < 0)
1794                 return -EINVAL;
1795         info->used = used;
1796         info->client = client->number;
1797 
1798         return 0;
1799 }
1800 
1801 
1802 /* SET_QUEUE_CLIENT ioctl() */
1803 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1804                                           void *arg)
1805 {
1806         struct snd_seq_queue_client *info = arg;
1807         int err;
1808 
1809         if (info->used >= 0) {
1810                 err = snd_seq_queue_use(info->queue, client->number, info->used);
1811                 if (err < 0)
1812                         return err;
1813         }
1814 
1815         return snd_seq_ioctl_get_queue_client(client, arg);
1816 }
1817 
1818 
1819 /* GET_CLIENT_POOL ioctl() */
1820 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1821                                          void *arg)
1822 {
1823         struct snd_seq_client_pool *info = arg;
1824         struct snd_seq_client *cptr;
1825 
1826         cptr = snd_seq_client_use_ptr(info->client);
1827         if (cptr == NULL)
1828                 return -ENOENT;
1829         memset(info, 0, sizeof(*info));
1830         info->client = cptr->number;
1831         info->output_pool = cptr->pool->size;
1832         info->output_room = cptr->pool->room;
1833         info->output_free = info->output_pool;
1834         info->output_free = snd_seq_unused_cells(cptr->pool);
1835         if (cptr->type == USER_CLIENT) {
1836                 info->input_pool = cptr->data.user.fifo_pool_size;
1837                 info->input_free = info->input_pool;
1838                 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1839         } else {
1840                 info->input_pool = 0;
1841                 info->input_free = 0;
1842         }
1843         snd_seq_client_unlock(cptr);
1844         
1845         return 0;
1846 }
1847 
1848 /* SET_CLIENT_POOL ioctl() */
1849 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1850                                          void *arg)
1851 {
1852         struct snd_seq_client_pool *info = arg;
1853         int rc;
1854 
1855         if (client->number != info->client)
1856                 return -EINVAL; /* can't change other clients */
1857 
1858         if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1859             (! snd_seq_write_pool_allocated(client) ||
1860              info->output_pool != client->pool->size)) {
1861                 if (snd_seq_write_pool_allocated(client)) {
1862                         /* is the pool in use? */
1863                         if (atomic_read(&client->pool->counter))
1864                                 return -EBUSY;
1865                         /* remove all existing cells */
1866                         snd_seq_pool_mark_closing(client->pool);
1867                         snd_seq_pool_done(client->pool);
1868                 }
1869                 client->pool->size = info->output_pool;
1870                 rc = snd_seq_pool_init(client->pool);
1871                 if (rc < 0)
1872                         return rc;
1873         }
1874         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1875             info->input_pool >= 1 &&
1876             info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1877             info->input_pool != client->data.user.fifo_pool_size) {
1878                 /* change pool size */
1879                 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1880                 if (rc < 0)
1881                         return rc;
1882                 client->data.user.fifo_pool_size = info->input_pool;
1883         }
1884         if (info->output_room >= 1 &&
1885             info->output_room <= client->pool->size) {
1886                 client->pool->room  = info->output_room;
1887         }
1888 
1889         return snd_seq_ioctl_get_client_pool(client, arg);
1890 }
1891 
1892 
1893 /* REMOVE_EVENTS ioctl() */
1894 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1895                                        void *arg)
1896 {
1897         struct snd_seq_remove_events *info = arg;
1898 
1899         /*
1900          * Input mostly not implemented XXX.
1901          */
1902         if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1903                 /*
1904                  * No restrictions so for a user client we can clear
1905                  * the whole fifo
1906                  */
1907                 if (client->type == USER_CLIENT && client->data.user.fifo)
1908                         snd_seq_fifo_clear(client->data.user.fifo);
1909         }
1910 
1911         if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1912                 snd_seq_queue_remove_cells(client->number, info);
1913 
1914         return 0;
1915 }
1916 
1917 
1918 /*
1919  * get subscription info
1920  */
1921 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1922                                           void *arg)
1923 {
1924         struct snd_seq_port_subscribe *subs = arg;
1925         int result;
1926         struct snd_seq_client *sender = NULL;
1927         struct snd_seq_client_port *sport = NULL;
1928 
1929         result = -EINVAL;
1930         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1931                 goto __end;
1932         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1933                 goto __end;
1934         result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
1935                                                subs);
1936       __end:
1937         if (sport)
1938                 snd_seq_port_unlock(sport);
1939         if (sender)
1940                 snd_seq_client_unlock(sender);
1941 
1942         return result;
1943 }
1944 
1945 
1946 /*
1947  * get subscription info - check only its presence
1948  */
1949 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1950 {
1951         struct snd_seq_query_subs *subs = arg;
1952         int result = -ENXIO;
1953         struct snd_seq_client *cptr = NULL;
1954         struct snd_seq_client_port *port = NULL;
1955         struct snd_seq_port_subs_info *group;
1956         struct list_head *p;
1957         int i;
1958 
1959         if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1960                 goto __end;
1961         if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1962                 goto __end;
1963 
1964         switch (subs->type) {
1965         case SNDRV_SEQ_QUERY_SUBS_READ:
1966                 group = &port->c_src;
1967                 break;
1968         case SNDRV_SEQ_QUERY_SUBS_WRITE:
1969                 group = &port->c_dest;
1970                 break;
1971         default:
1972                 goto __end;
1973         }
1974 
1975         down_read(&group->list_mutex);
1976         /* search for the subscriber */
1977         subs->num_subs = group->count;
1978         i = 0;
1979         result = -ENOENT;
1980         list_for_each(p, &group->list_head) {
1981                 if (i++ == subs->index) {
1982                         /* found! */
1983                         struct snd_seq_subscribers *s;
1984                         if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1985                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
1986                                 subs->addr = s->info.dest;
1987                         } else {
1988                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1989                                 subs->addr = s->info.sender;
1990                         }
1991                         subs->flags = s->info.flags;
1992                         subs->queue = s->info.queue;
1993                         result = 0;
1994                         break;
1995                 }
1996         }
1997         up_read(&group->list_mutex);
1998 
1999       __end:
2000         if (port)
2001                 snd_seq_port_unlock(port);
2002         if (cptr)
2003                 snd_seq_client_unlock(cptr);
2004 
2005         return result;
2006 }
2007 
2008 
2009 /*
2010  * query next client
2011  */
2012 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2013                                            void *arg)
2014 {
2015         struct snd_seq_client_info *info = arg;
2016         struct snd_seq_client *cptr = NULL;
2017 
2018         /* search for next client */
2019         if (info->client < INT_MAX)
2020                 info->client++;
2021         if (info->client < 0)
2022                 info->client = 0;
2023         for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2024                 cptr = snd_seq_client_use_ptr(info->client);
2025                 if (cptr)
2026                         break; /* found */
2027         }
2028         if (cptr == NULL)
2029                 return -ENOENT;
2030 
2031         get_client_info(cptr, info);
2032         snd_seq_client_unlock(cptr);
2033 
2034         return 0;
2035 }
2036 
2037 /* 
2038  * query next port
2039  */
2040 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2041                                          void *arg)
2042 {
2043         struct snd_seq_port_info *info = arg;
2044         struct snd_seq_client *cptr;
2045         struct snd_seq_client_port *port = NULL;
2046 
2047         cptr = snd_seq_client_use_ptr(info->addr.client);
2048         if (cptr == NULL)
2049                 return -ENXIO;
2050 
2051         /* search for next port */
2052         info->addr.port++;
2053         port = snd_seq_port_query_nearest(cptr, info);
2054         if (port == NULL) {
2055                 snd_seq_client_unlock(cptr);
2056                 return -ENOENT;
2057         }
2058 
2059         /* get port info */
2060         info->addr = port->addr;
2061         snd_seq_get_port_info(port, info);
2062         snd_seq_port_unlock(port);
2063         snd_seq_client_unlock(cptr);
2064 
2065         return 0;
2066 }
2067 
2068 /* -------------------------------------------------------- */
2069 
2070 static const struct ioctl_handler {
2071         unsigned int cmd;
2072         int (*func)(struct snd_seq_client *client, void *arg);
2073 } ioctl_handlers[] = {
2074         { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2075         { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2076         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2077         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2078         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2079         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2080         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2081         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2082         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2083         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2084         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2085         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2086         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2087         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2088         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2089         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2090         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2091         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2092         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2093         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2094         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2095         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2096         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2097         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2098         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2099         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2100         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2101         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2102         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2103         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2104         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2105         { 0, NULL },
2106 };
2107 
2108 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2109                           unsigned long arg)
2110 {
2111         struct snd_seq_client *client = file->private_data;
2112         /* To use kernel stack for ioctl data. */
2113         union {
2114                 int pversion;
2115                 int client_id;
2116                 struct snd_seq_system_info      system_info;
2117                 struct snd_seq_running_info     running_info;
2118                 struct snd_seq_client_info      client_info;
2119                 struct snd_seq_port_info        port_info;
2120                 struct snd_seq_port_subscribe   port_subscribe;
2121                 struct snd_seq_queue_info       queue_info;
2122                 struct snd_seq_queue_status     queue_status;
2123                 struct snd_seq_queue_tempo      tempo;
2124                 struct snd_seq_queue_timer      queue_timer;
2125                 struct snd_seq_queue_client     queue_client;
2126                 struct snd_seq_client_pool      client_pool;
2127                 struct snd_seq_remove_events    remove_events;
2128                 struct snd_seq_query_subs       query_subs;
2129         } buf;
2130         const struct ioctl_handler *handler;
2131         unsigned long size;
2132         int err;
2133 
2134         if (snd_BUG_ON(!client))
2135                 return -ENXIO;
2136 
2137         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2138                 if (handler->cmd == cmd)
2139                         break;
2140         }
2141         if (handler->cmd == 0)
2142                 return -ENOTTY;
2143 
2144         memset(&buf, 0, sizeof(buf));
2145 
2146         /*
2147          * All of ioctl commands for ALSA sequencer get an argument of size
2148          * within 13 bits. We can safely pick up the size from the command.
2149          */
2150         size = _IOC_SIZE(handler->cmd);
2151         if (handler->cmd & IOC_IN) {
2152                 if (copy_from_user(&buf, (const void __user *)arg, size))
2153                         return -EFAULT;
2154         }
2155 
2156         mutex_lock(&client->ioctl_mutex);
2157         err = handler->func(client, &buf);
2158         mutex_unlock(&client->ioctl_mutex);
2159         if (err >= 0) {
2160                 /* Some commands includes a bug in 'dir' field. */
2161                 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2162                     handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2163                     (handler->cmd & IOC_OUT))
2164                         if (copy_to_user((void __user *)arg, &buf, size))
2165                                 return -EFAULT;
2166         }
2167 
2168         return err;
2169 }
2170 
2171 #ifdef CONFIG_COMPAT
2172 #include "seq_compat.c"
2173 #else
2174 #define snd_seq_ioctl_compat    NULL
2175 #endif
2176 
2177 /* -------------------------------------------------------- */
2178 
2179 
2180 /* exported to kernel modules */
2181 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2182                                  const char *name_fmt, ...)
2183 {
2184         struct snd_seq_client *client;
2185         va_list args;
2186 
2187         if (snd_BUG_ON(in_interrupt()))
2188                 return -EBUSY;
2189 
2190         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2191                 return -EINVAL;
2192         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2193                 return -EINVAL;
2194 
2195         mutex_lock(&register_mutex);
2196 
2197         if (card) {
2198                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2199                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2200                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2201                         client_index = -1;
2202         }
2203 
2204         /* empty write queue as default */
2205         client = seq_create_client1(client_index, 0);
2206         if (client == NULL) {
2207                 mutex_unlock(&register_mutex);
2208                 return -EBUSY;  /* failure code */
2209         }
2210         usage_alloc(&client_usage, 1);
2211 
2212         client->accept_input = 1;
2213         client->accept_output = 1;
2214         client->data.kernel.card = card;
2215                 
2216         va_start(args, name_fmt);
2217         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2218         va_end(args);
2219 
2220         client->type = KERNEL_CLIENT;
2221         mutex_unlock(&register_mutex);
2222 
2223         /* make others aware this new client */
2224         snd_seq_system_client_ev_client_start(client->number);
2225         
2226         /* return client number to caller */
2227         return client->number;
2228 }
2229 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2230 
2231 /* exported to kernel modules */
2232 int snd_seq_delete_kernel_client(int client)
2233 {
2234         struct snd_seq_client *ptr;
2235 
2236         if (snd_BUG_ON(in_interrupt()))
2237                 return -EBUSY;
2238 
2239         ptr = clientptr(client);
2240         if (ptr == NULL)
2241                 return -EINVAL;
2242 
2243         seq_free_client(ptr);
2244         kfree(ptr);
2245         return 0;
2246 }
2247 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2248 
2249 /*
2250  * exported, called by kernel clients to enqueue events (w/o blocking)
2251  *
2252  * RETURN VALUE: zero if succeed, negative if error
2253  */
2254 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
2255                                   struct file *file, bool blocking)
2256 {
2257         struct snd_seq_client *cptr;
2258         int result;
2259 
2260         if (snd_BUG_ON(!ev))
2261                 return -EINVAL;
2262 
2263         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2264                 return 0; /* ignore this */
2265         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2266                 return -EINVAL; /* quoted events can't be enqueued */
2267 
2268         /* fill in client number */
2269         ev->source.client = client;
2270 
2271         if (check_event_type_and_length(ev))
2272                 return -EINVAL;
2273 
2274         cptr = snd_seq_client_use_ptr(client);
2275         if (cptr == NULL)
2276                 return -EINVAL;
2277         
2278         if (!cptr->accept_output) {
2279                 result = -EPERM;
2280         } else { /* send it */
2281                 mutex_lock(&cptr->ioctl_mutex);
2282                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2283                                                       false, 0,
2284                                                       &cptr->ioctl_mutex);
2285                 mutex_unlock(&cptr->ioctl_mutex);
2286         }
2287 
2288         snd_seq_client_unlock(cptr);
2289         return result;
2290 }
2291 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2292 
2293 /* 
2294  * exported, called by kernel clients to dispatch events directly to other
2295  * clients, bypassing the queues.  Event time-stamp will be updated.
2296  *
2297  * RETURN VALUE: negative = delivery failed,
2298  *               zero, or positive: the number of delivered events
2299  */
2300 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2301                                    int atomic, int hop)
2302 {
2303         struct snd_seq_client *cptr;
2304         int result;
2305 
2306         if (snd_BUG_ON(!ev))
2307                 return -EINVAL;
2308 
2309         /* fill in client number */
2310         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2311         ev->source.client = client;
2312 
2313         if (check_event_type_and_length(ev))
2314                 return -EINVAL;
2315 
2316         cptr = snd_seq_client_use_ptr(client);
2317         if (cptr == NULL)
2318                 return -EINVAL;
2319 
2320         if (!cptr->accept_output)
2321                 result = -EPERM;
2322         else
2323                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2324 
2325         snd_seq_client_unlock(cptr);
2326         return result;
2327 }
2328 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2329 
2330 /**
2331  * snd_seq_kernel_client_ctl - operate a command for a client with data in
2332  *                             kernel space.
2333  * @clientid:   A numerical ID for a client.
2334  * @cmd:        An ioctl(2) command for ALSA sequencer operation.
2335  * @arg:        A pointer to data in kernel space.
2336  *
2337  * Against its name, both kernel/application client can be handled by this
2338  * kernel API. A pointer of 'arg' argument should be in kernel space.
2339  *
2340  * Return: 0 at success. Negative error code at failure.
2341  */
2342 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2343 {
2344         const struct ioctl_handler *handler;
2345         struct snd_seq_client *client;
2346 
2347         client = clientptr(clientid);
2348         if (client == NULL)
2349                 return -ENXIO;
2350 
2351         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2352                 if (handler->cmd == cmd)
2353                         return handler->func(client, arg);
2354         }
2355 
2356         pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2357                  cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2358         return -ENOTTY;
2359 }
2360 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2361 
2362 /* exported (for OSS emulator) */
2363 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2364 {
2365         struct snd_seq_client *client;
2366 
2367         client = clientptr(clientid);
2368         if (client == NULL)
2369                 return -ENXIO;
2370 
2371         if (! snd_seq_write_pool_allocated(client))
2372                 return 1;
2373         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2374                 return 1;
2375         return 0;
2376 }
2377 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2378 
2379 /*---------------------------------------------------------------------------*/
2380 
2381 #ifdef CONFIG_SND_PROC_FS
2382 /*
2383  *  /proc interface
2384  */
2385 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2386                                           struct snd_seq_port_subs_info *group,
2387                                           int is_src, char *msg)
2388 {
2389         struct list_head *p;
2390         struct snd_seq_subscribers *s;
2391         int count = 0;
2392 
2393         down_read(&group->list_mutex);
2394         if (list_empty(&group->list_head)) {
2395                 up_read(&group->list_mutex);
2396                 return;
2397         }
2398         snd_iprintf(buffer, msg);
2399         list_for_each(p, &group->list_head) {
2400                 if (is_src)
2401                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2402                 else
2403                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2404                 if (count++)
2405                         snd_iprintf(buffer, ", ");
2406                 snd_iprintf(buffer, "%d:%d",
2407                             is_src ? s->info.dest.client : s->info.sender.client,
2408                             is_src ? s->info.dest.port : s->info.sender.port);
2409                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2410                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2411                 if (group->exclusive)
2412                         snd_iprintf(buffer, "[ex]");
2413         }
2414         up_read(&group->list_mutex);
2415         snd_iprintf(buffer, "\n");
2416 }
2417 
2418 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2419 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2420 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2421 
2422 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2423 
2424 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2425                                     struct snd_seq_client *client)
2426 {
2427         struct snd_seq_client_port *p;
2428 
2429         mutex_lock(&client->ports_mutex);
2430         list_for_each_entry(p, &client->ports_list_head, list) {
2431                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2432                             p->addr.port, p->name,
2433                             FLAG_PERM_RD(p->capability),
2434                             FLAG_PERM_WR(p->capability),
2435                             FLAG_PERM_EX(p->capability),
2436                             FLAG_PERM_DUPLEX(p->capability));
2437                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2438                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2439         }
2440         mutex_unlock(&client->ports_mutex);
2441 }
2442 
2443 
2444 /* exported to seq_info.c */
2445 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2446                                struct snd_info_buffer *buffer)
2447 {
2448         int c;
2449         struct snd_seq_client *client;
2450 
2451         snd_iprintf(buffer, "Client info\n");
2452         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2453         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2454         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2455         snd_iprintf(buffer, "\n");
2456 
2457         /* list the client table */
2458         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2459                 client = snd_seq_client_use_ptr(c);
2460                 if (client == NULL)
2461                         continue;
2462                 if (client->type == NO_CLIENT) {
2463                         snd_seq_client_unlock(client);
2464                         continue;
2465                 }
2466 
2467                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2468                             c, client->name,
2469                             client->type == USER_CLIENT ? "User" : "Kernel");
2470                 snd_seq_info_dump_ports(buffer, client);
2471                 if (snd_seq_write_pool_allocated(client)) {
2472                         snd_iprintf(buffer, "  Output pool :\n");
2473                         snd_seq_info_pool(buffer, client->pool, "    ");
2474                 }
2475                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2476                     client->data.user.fifo->pool) {
2477                         snd_iprintf(buffer, "  Input pool :\n");
2478                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2479                 }
2480                 snd_seq_client_unlock(client);
2481         }
2482 }
2483 #endif /* CONFIG_SND_PROC_FS */
2484 
2485 /*---------------------------------------------------------------------------*/
2486 
2487 
2488 /*
2489  *  REGISTRATION PART
2490  */
2491 
2492 static const struct file_operations snd_seq_f_ops =
2493 {
2494         .owner =        THIS_MODULE,
2495         .read =         snd_seq_read,
2496         .write =        snd_seq_write,
2497         .open =         snd_seq_open,
2498         .release =      snd_seq_release,
2499         .llseek =       no_llseek,
2500         .poll =         snd_seq_poll,
2501         .unlocked_ioctl =       snd_seq_ioctl,
2502         .compat_ioctl = snd_seq_ioctl_compat,
2503 };
2504 
2505 static struct device seq_dev;
2506 
2507 /* 
2508  * register sequencer device 
2509  */
2510 int __init snd_sequencer_device_init(void)
2511 {
2512         int err;
2513 
2514         snd_device_initialize(&seq_dev, NULL);
2515         dev_set_name(&seq_dev, "seq");
2516 
2517         mutex_lock(&register_mutex);
2518         err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2519                                   &snd_seq_f_ops, NULL, &seq_dev);
2520         mutex_unlock(&register_mutex);
2521         if (err < 0) {
2522                 put_device(&seq_dev);
2523                 return err;
2524         }
2525         
2526         return 0;
2527 }
2528 
2529 
2530 
2531 /* 
2532  * unregister sequencer device 
2533  */
2534 void snd_sequencer_device_done(void)
2535 {
2536         snd_unregister_device(&seq_dev);
2537         put_device(&seq_dev);
2538 }
2539 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp