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

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  1 /*
  2  *  ALSA sequencer Client Manager
  3  *  Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
  4  *                             Jaroslav Kysela <perex@perex.cz>
  5  *                             Takashi Iwai <tiwai@suse.de>
  6  *
  7  *
  8  *   This program is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU General Public License as published by
 10  *   the Free Software Foundation; either version 2 of the License, or
 11  *   (at your option) any later version.
 12  *
 13  *   This program is distributed in the hope that it will be useful,
 14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  *   GNU General Public License for more details.
 17  *
 18  *   You should have received a copy of the GNU General Public License
 19  *   along with this program; if not, write to the Free Software
 20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  *
 22  */
 23 
 24 #include <linux/init.h>
 25 #include <linux/export.h>
 26 #include <linux/slab.h>
 27 #include <sound/core.h>
 28 #include <sound/minors.h>
 29 #include <linux/kmod.h>
 30 
 31 #include <sound/seq_kernel.h>
 32 #include "seq_clientmgr.h"
 33 #include "seq_memory.h"
 34 #include "seq_queue.h"
 35 #include "seq_timer.h"
 36 #include "seq_info.h"
 37 #include "seq_system.h"
 38 #include <sound/seq_device.h>
 39 #ifdef CONFIG_COMPAT
 40 #include <linux/compat.h>
 41 #endif
 42 
 43 /* Client Manager
 44 
 45  * this module handles the connections of userland and kernel clients
 46  * 
 47  */
 48 
 49 /*
 50  * There are four ranges of client numbers (last two shared):
 51  * 0..15: global clients
 52  * 16..127: statically allocated client numbers for cards 0..27
 53  * 128..191: dynamically allocated client numbers for cards 28..31
 54  * 128..191: dynamically allocated client numbers for applications
 55  */
 56 
 57 /* number of kernel non-card clients */
 58 #define SNDRV_SEQ_GLOBAL_CLIENTS        16
 59 /* clients per cards, for static clients */
 60 #define SNDRV_SEQ_CLIENTS_PER_CARD      4
 61 /* dynamically allocated client numbers (both kernel drivers and user space) */
 62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
 63 
 64 #define SNDRV_SEQ_LFLG_INPUT    0x0001
 65 #define SNDRV_SEQ_LFLG_OUTPUT   0x0002
 66 #define SNDRV_SEQ_LFLG_OPEN     (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
 67 
 68 static DEFINE_SPINLOCK(clients_lock);
 69 static DEFINE_MUTEX(register_mutex);
 70 
 71 /*
 72  * client table
 73  */
 74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
 75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
 76 static struct snd_seq_usage client_usage;
 77 
 78 /*
 79  * prototypes
 80  */
 81 static int bounce_error_event(struct snd_seq_client *client,
 82                               struct snd_seq_event *event,
 83                               int err, int atomic, int hop);
 84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
 85                                         struct snd_seq_event *event,
 86                                         int filter, int atomic, int hop);
 87 
 88 /*
 89  */
 90 static inline unsigned short snd_seq_file_flags(struct file *file)
 91 {
 92         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
 93         case FMODE_WRITE:
 94                 return SNDRV_SEQ_LFLG_OUTPUT;
 95         case FMODE_READ:
 96                 return SNDRV_SEQ_LFLG_INPUT;
 97         default:
 98                 return SNDRV_SEQ_LFLG_OPEN;
 99         }
100 }
101 
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
103 {
104         return snd_seq_total_cells(client->pool) > 0;
105 }
106 
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
109 {
110         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
112                            clientid);
113                 return NULL;
114         }
115         return clienttab[clientid];
116 }
117 
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
119 {
120         unsigned long flags;
121         struct snd_seq_client *client;
122 
123         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
125                            clientid);
126                 return NULL;
127         }
128         spin_lock_irqsave(&clients_lock, flags);
129         client = clientptr(clientid);
130         if (client)
131                 goto __lock;
132         if (clienttablock[clientid]) {
133                 spin_unlock_irqrestore(&clients_lock, flags);
134                 return NULL;
135         }
136         spin_unlock_irqrestore(&clients_lock, flags);
137 #ifdef CONFIG_MODULES
138         if (!in_interrupt()) {
139                 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140                 static char card_requested[SNDRV_CARDS];
141                 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
142                         int idx;
143                         
144                         if (!client_requested[clientid]) {
145                                 client_requested[clientid] = 1;
146                                 for (idx = 0; idx < 15; idx++) {
147                                         if (seq_client_load[idx] < 0)
148                                                 break;
149                                         if (seq_client_load[idx] == clientid) {
150                                                 request_module("snd-seq-client-%i",
151                                                                clientid);
152                                                 break;
153                                         }
154                                 }
155                         }
156                 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157                         int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158                                 SNDRV_SEQ_CLIENTS_PER_CARD;
159                         if (card < snd_ecards_limit) {
160                                 if (! card_requested[card]) {
161                                         card_requested[card] = 1;
162                                         snd_request_card(card);
163                                 }
164                                 snd_seq_device_load_drivers();
165                         }
166                 }
167                 spin_lock_irqsave(&clients_lock, flags);
168                 client = clientptr(clientid);
169                 if (client)
170                         goto __lock;
171                 spin_unlock_irqrestore(&clients_lock, flags);
172         }
173 #endif
174         return NULL;
175 
176       __lock:
177         snd_use_lock_use(&client->use_lock);
178         spin_unlock_irqrestore(&clients_lock, flags);
179         return client;
180 }
181 
182 static void usage_alloc(struct snd_seq_usage *res, int num)
183 {
184         res->cur += num;
185         if (res->cur > res->peak)
186                 res->peak = res->cur;
187 }
188 
189 static void usage_free(struct snd_seq_usage *res, int num)
190 {
191         res->cur -= num;
192 }
193 
194 /* initialise data structures */
195 int __init client_init_data(void)
196 {
197         /* zap out the client table */
198         memset(&clienttablock, 0, sizeof(clienttablock));
199         memset(&clienttab, 0, sizeof(clienttab));
200         return 0;
201 }
202 
203 
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
205 {
206         unsigned long flags;
207         int c;
208         struct snd_seq_client *client;
209 
210         /* init client data */
211         client = kzalloc(sizeof(*client), GFP_KERNEL);
212         if (client == NULL)
213                 return NULL;
214         client->pool = snd_seq_pool_new(poolsize);
215         if (client->pool == NULL) {
216                 kfree(client);
217                 return NULL;
218         }
219         client->type = NO_CLIENT;
220         snd_use_lock_init(&client->use_lock);
221         rwlock_init(&client->ports_lock);
222         mutex_init(&client->ports_mutex);
223         INIT_LIST_HEAD(&client->ports_list_head);
224         mutex_init(&client->ioctl_mutex);
225 
226         /* find free slot in the client table */
227         spin_lock_irqsave(&clients_lock, flags);
228         if (client_index < 0) {
229                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
230                      c < SNDRV_SEQ_MAX_CLIENTS;
231                      c++) {
232                         if (clienttab[c] || clienttablock[c])
233                                 continue;
234                         clienttab[client->number = c] = client;
235                         spin_unlock_irqrestore(&clients_lock, flags);
236                         return client;
237                 }
238         } else {
239                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
240                         clienttab[client->number = client_index] = client;
241                         spin_unlock_irqrestore(&clients_lock, flags);
242                         return client;
243                 }
244         }
245         spin_unlock_irqrestore(&clients_lock, flags);
246         snd_seq_pool_delete(&client->pool);
247         kfree(client);
248         return NULL;    /* no free slot found or busy, return failure code */
249 }
250 
251 
252 static int seq_free_client1(struct snd_seq_client *client)
253 {
254         unsigned long flags;
255 
256         if (!client)
257                 return 0;
258         spin_lock_irqsave(&clients_lock, flags);
259         clienttablock[client->number] = 1;
260         clienttab[client->number] = NULL;
261         spin_unlock_irqrestore(&clients_lock, flags);
262         snd_seq_delete_all_ports(client);
263         snd_seq_queue_client_leave(client->number);
264         snd_use_lock_sync(&client->use_lock);
265         snd_seq_queue_client_termination(client->number);
266         if (client->pool)
267                 snd_seq_pool_delete(&client->pool);
268         spin_lock_irqsave(&clients_lock, flags);
269         clienttablock[client->number] = 0;
270         spin_unlock_irqrestore(&clients_lock, flags);
271         return 0;
272 }
273 
274 
275 static void seq_free_client(struct snd_seq_client * client)
276 {
277         mutex_lock(&register_mutex);
278         switch (client->type) {
279         case NO_CLIENT:
280                 pr_warn("ALSA: seq: Trying to free unused client %d\n",
281                         client->number);
282                 break;
283         case USER_CLIENT:
284         case KERNEL_CLIENT:
285                 seq_free_client1(client);
286                 usage_free(&client_usage, 1);
287                 break;
288 
289         default:
290                 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
291                            client->number, client->type);
292         }
293         mutex_unlock(&register_mutex);
294 
295         snd_seq_system_client_ev_client_exit(client->number);
296 }
297 
298 
299 
300 /* -------------------------------------------------------- */
301 
302 /* create a user client */
303 static int snd_seq_open(struct inode *inode, struct file *file)
304 {
305         int c, mode;                    /* client id */
306         struct snd_seq_client *client;
307         struct snd_seq_user_client *user;
308         int err;
309 
310         err = nonseekable_open(inode, file);
311         if (err < 0)
312                 return err;
313 
314         mutex_lock(&register_mutex);
315         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
316         if (!client) {
317                 mutex_unlock(&register_mutex);
318                 return -ENOMEM; /* failure code */
319         }
320 
321         mode = snd_seq_file_flags(file);
322         if (mode & SNDRV_SEQ_LFLG_INPUT)
323                 client->accept_input = 1;
324         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
325                 client->accept_output = 1;
326 
327         user = &client->data.user;
328         user->fifo = NULL;
329         user->fifo_pool_size = 0;
330 
331         if (mode & SNDRV_SEQ_LFLG_INPUT) {
332                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
333                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
334                 if (user->fifo == NULL) {
335                         seq_free_client1(client);
336                         kfree(client);
337                         mutex_unlock(&register_mutex);
338                         return -ENOMEM;
339                 }
340         }
341 
342         usage_alloc(&client_usage, 1);
343         client->type = USER_CLIENT;
344         mutex_unlock(&register_mutex);
345 
346         c = client->number;
347         file->private_data = client;
348 
349         /* fill client data */
350         user->file = file;
351         sprintf(client->name, "Client-%d", c);
352         client->data.user.owner = get_pid(task_pid(current));
353 
354         /* make others aware this new client */
355         snd_seq_system_client_ev_client_start(c);
356 
357         return 0;
358 }
359 
360 /* delete a user client */
361 static int snd_seq_release(struct inode *inode, struct file *file)
362 {
363         struct snd_seq_client *client = file->private_data;
364 
365         if (client) {
366                 seq_free_client(client);
367                 if (client->data.user.fifo)
368                         snd_seq_fifo_delete(&client->data.user.fifo);
369                 put_pid(client->data.user.owner);
370                 kfree(client);
371         }
372 
373         return 0;
374 }
375 
376 
377 /* handle client read() */
378 /* possible error values:
379  *      -ENXIO  invalid client or file open mode
380  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
381  *      -EINVAL no enough user-space buffer to write the whole event
382  *      -EFAULT seg. fault during copy to user space
383  */
384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385                             loff_t *offset)
386 {
387         struct snd_seq_client *client = file->private_data;
388         struct snd_seq_fifo *fifo;
389         int err;
390         long result = 0;
391         struct snd_seq_event_cell *cell;
392 
393         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
394                 return -ENXIO;
395 
396         if (!access_ok(VERIFY_WRITE, buf, count))
397                 return -EFAULT;
398 
399         /* check client structures are in place */
400         if (snd_BUG_ON(!client))
401                 return -ENXIO;
402 
403         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
404                 return -ENXIO;
405 
406         if (atomic_read(&fifo->overflow) > 0) {
407                 /* buffer overflow is detected */
408                 snd_seq_fifo_clear(fifo);
409                 /* return error code */
410                 return -ENOSPC;
411         }
412 
413         cell = NULL;
414         err = 0;
415         snd_seq_fifo_lock(fifo);
416 
417         /* while data available in queue */
418         while (count >= sizeof(struct snd_seq_event)) {
419                 int nonblock;
420 
421                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
422                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
423                         break;
424                 }
425                 if (snd_seq_ev_is_variable(&cell->event)) {
426                         struct snd_seq_event tmpev;
427                         tmpev = cell->event;
428                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
429                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
430                                 err = -EFAULT;
431                                 break;
432                         }
433                         count -= sizeof(struct snd_seq_event);
434                         buf += sizeof(struct snd_seq_event);
435                         err = snd_seq_expand_var_event(&cell->event, count,
436                                                        (char __force *)buf, 0,
437                                                        sizeof(struct snd_seq_event));
438                         if (err < 0)
439                                 break;
440                         result += err;
441                         count -= err;
442                         buf += err;
443                 } else {
444                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
445                                 err = -EFAULT;
446                                 break;
447                         }
448                         count -= sizeof(struct snd_seq_event);
449                         buf += sizeof(struct snd_seq_event);
450                 }
451                 snd_seq_cell_free(cell);
452                 cell = NULL; /* to be sure */
453                 result += sizeof(struct snd_seq_event);
454         }
455 
456         if (err < 0) {
457                 if (cell)
458                         snd_seq_fifo_cell_putback(fifo, cell);
459                 if (err == -EAGAIN && result > 0)
460                         err = 0;
461         }
462         snd_seq_fifo_unlock(fifo);
463 
464         return (err < 0) ? err : result;
465 }
466 
467 
468 /*
469  * check access permission to the port
470  */
471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
472 {
473         if ((port->capability & flags) != flags)
474                 return 0;
475         return flags;
476 }
477 
478 /*
479  * check if the destination client is available, and return the pointer
480  * if filter is non-zero, client filter bitmap is tested.
481  */
482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483                                                     int filter)
484 {
485         struct snd_seq_client *dest;
486 
487         dest = snd_seq_client_use_ptr(event->dest.client);
488         if (dest == NULL)
489                 return NULL;
490         if (! dest->accept_input)
491                 goto __not_avail;
492         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
493             ! test_bit(event->type, dest->event_filter))
494                 goto __not_avail;
495         if (filter && !(dest->filter & filter))
496                 goto __not_avail;
497 
498         return dest; /* ok - accessible */
499 __not_avail:
500         snd_seq_client_unlock(dest);
501         return NULL;
502 }
503 
504 
505 /*
506  * Return the error event.
507  *
508  * If the receiver client is a user client, the original event is
509  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
510  * the original event is also variable length, the external data is
511  * copied after the event record. 
512  * If the receiver client is a kernel client, the original event is
513  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
514  * kmalloc.
515  */
516 static int bounce_error_event(struct snd_seq_client *client,
517                               struct snd_seq_event *event,
518                               int err, int atomic, int hop)
519 {
520         struct snd_seq_event bounce_ev;
521         int result;
522 
523         if (client == NULL ||
524             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
525             ! client->accept_input)
526                 return 0; /* ignored */
527 
528         /* set up quoted error */
529         memset(&bounce_ev, 0, sizeof(bounce_ev));
530         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
531         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
532         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
533         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
534         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
535         bounce_ev.dest.client = client->number;
536         bounce_ev.dest.port = event->source.port;
537         bounce_ev.data.quote.origin = event->dest;
538         bounce_ev.data.quote.event = event;
539         bounce_ev.data.quote.value = -err; /* use positive value */
540         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
541         if (result < 0) {
542                 client->event_lost++;
543                 return result;
544         }
545 
546         return result;
547 }
548 
549 
550 /*
551  * rewrite the time-stamp of the event record with the curren time
552  * of the given queue.
553  * return non-zero if updated.
554  */
555 static int update_timestamp_of_queue(struct snd_seq_event *event,
556                                      int queue, int real_time)
557 {
558         struct snd_seq_queue *q;
559 
560         q = queueptr(queue);
561         if (! q)
562                 return 0;
563         event->queue = queue;
564         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
565         if (real_time) {
566                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
567                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
568         } else {
569                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
570                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
571         }
572         queuefree(q);
573         return 1;
574 }
575 
576 
577 /*
578  * deliver an event to the specified destination.
579  * if filter is non-zero, client filter bitmap is tested.
580  *
581  *  RETURN VALUE: 0 : if succeeded
582  *               <0 : error
583  */
584 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585                                         struct snd_seq_event *event,
586                                         int filter, int atomic, int hop)
587 {
588         struct snd_seq_client *dest = NULL;
589         struct snd_seq_client_port *dest_port = NULL;
590         int result = -ENOENT;
591         int direct;
592 
593         direct = snd_seq_ev_is_direct(event);
594 
595         dest = get_event_dest_client(event, filter);
596         if (dest == NULL)
597                 goto __skip;
598         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
599         if (dest_port == NULL)
600                 goto __skip;
601 
602         /* check permission */
603         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
604                 result = -EPERM;
605                 goto __skip;
606         }
607                 
608         if (dest_port->timestamping)
609                 update_timestamp_of_queue(event, dest_port->time_queue,
610                                           dest_port->time_real);
611 
612         switch (dest->type) {
613         case USER_CLIENT:
614                 if (dest->data.user.fifo)
615                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
616                 break;
617 
618         case KERNEL_CLIENT:
619                 if (dest_port->event_input == NULL)
620                         break;
621                 result = dest_port->event_input(event, direct,
622                                                 dest_port->private_data,
623                                                 atomic, hop);
624                 break;
625         default:
626                 break;
627         }
628 
629   __skip:
630         if (dest_port)
631                 snd_seq_port_unlock(dest_port);
632         if (dest)
633                 snd_seq_client_unlock(dest);
634 
635         if (result < 0 && !direct) {
636                 result = bounce_error_event(client, event, result, atomic, hop);
637         }
638         return result;
639 }
640 
641 
642 /*
643  * send the event to all subscribers:
644  */
645 static int deliver_to_subscribers(struct snd_seq_client *client,
646                                   struct snd_seq_event *event,
647                                   int atomic, int hop)
648 {
649         struct snd_seq_subscribers *subs;
650         int err, result = 0, num_ev = 0;
651         struct snd_seq_event event_saved;
652         struct snd_seq_client_port *src_port;
653         struct snd_seq_port_subs_info *grp;
654 
655         src_port = snd_seq_port_use_ptr(client, event->source.port);
656         if (src_port == NULL)
657                 return -EINVAL; /* invalid source port */
658         /* save original event record */
659         event_saved = *event;
660         grp = &src_port->c_src;
661         
662         /* lock list */
663         if (atomic)
664                 read_lock(&grp->list_lock);
665         else
666                 down_read_nested(&grp->list_mutex, hop);
667         list_for_each_entry(subs, &grp->list_head, src_list) {
668                 /* both ports ready? */
669                 if (atomic_read(&subs->ref_count) != 2)
670                         continue;
671                 event->dest = subs->info.dest;
672                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
673                         /* convert time according to flag with subscription */
674                         update_timestamp_of_queue(event, subs->info.queue,
675                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
676                 err = snd_seq_deliver_single_event(client, event,
677                                                    0, atomic, hop);
678                 if (err < 0) {
679                         /* save first error that occurs and continue */
680                         if (!result)
681                                 result = err;
682                         continue;
683                 }
684                 num_ev++;
685                 /* restore original event record */
686                 *event = event_saved;
687         }
688         if (atomic)
689                 read_unlock(&grp->list_lock);
690         else
691                 up_read(&grp->list_mutex);
692         *event = event_saved; /* restore */
693         snd_seq_port_unlock(src_port);
694         return (result < 0) ? result : num_ev;
695 }
696 
697 
698 #ifdef SUPPORT_BROADCAST 
699 /*
700  * broadcast to all ports:
701  */
702 static int port_broadcast_event(struct snd_seq_client *client,
703                                 struct snd_seq_event *event,
704                                 int atomic, int hop)
705 {
706         int num_ev = 0, err, result = 0;
707         struct snd_seq_client *dest_client;
708         struct snd_seq_client_port *port;
709 
710         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711         if (dest_client == NULL)
712                 return 0; /* no matching destination */
713 
714         read_lock(&dest_client->ports_lock);
715         list_for_each_entry(port, &dest_client->ports_list_head, list) {
716                 event->dest.port = port->addr.port;
717                 /* pass NULL as source client to avoid error bounce */
718                 err = snd_seq_deliver_single_event(NULL, event,
719                                                    SNDRV_SEQ_FILTER_BROADCAST,
720                                                    atomic, hop);
721                 if (err < 0) {
722                         /* save first error that occurs and continue */
723                         if (!result)
724                                 result = err;
725                         continue;
726                 }
727                 num_ev++;
728         }
729         read_unlock(&dest_client->ports_lock);
730         snd_seq_client_unlock(dest_client);
731         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
732         return (result < 0) ? result : num_ev;
733 }
734 
735 /*
736  * send the event to all clients:
737  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738  */
739 static int broadcast_event(struct snd_seq_client *client,
740                            struct snd_seq_event *event, int atomic, int hop)
741 {
742         int err, result = 0, num_ev = 0;
743         int dest;
744         struct snd_seq_addr addr;
745 
746         addr = event->dest; /* save */
747 
748         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
749                 /* don't send to itself */
750                 if (dest == client->number)
751                         continue;
752                 event->dest.client = dest;
753                 event->dest.port = addr.port;
754                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
755                         err = port_broadcast_event(client, event, atomic, hop);
756                 else
757                         /* pass NULL as source client to avoid error bounce */
758                         err = snd_seq_deliver_single_event(NULL, event,
759                                                            SNDRV_SEQ_FILTER_BROADCAST,
760                                                            atomic, hop);
761                 if (err < 0) {
762                         /* save first error that occurs and continue */
763                         if (!result)
764                                 result = err;
765                         continue;
766                 }
767                 num_ev += err;
768         }
769         event->dest = addr; /* restore */
770         return (result < 0) ? result : num_ev;
771 }
772 
773 
774 /* multicast - not supported yet */
775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
776                            int atomic, int hop)
777 {
778         pr_debug("ALSA: seq: multicast not supported yet.\n");
779         return 0; /* ignored */
780 }
781 #endif /* SUPPORT_BROADCAST */
782 
783 
784 /* deliver an event to the destination port(s).
785  * if the event is to subscribers or broadcast, the event is dispatched
786  * to multiple targets.
787  *
788  * RETURN VALUE: n > 0  : the number of delivered events.
789  *               n == 0 : the event was not passed to any client.
790  *               n < 0  : error - event was not processed.
791  */
792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
793                                  int atomic, int hop)
794 {
795         int result;
796 
797         hop++;
798         if (hop >= SNDRV_SEQ_MAX_HOPS) {
799                 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
800                            event->source.client, event->source.port,
801                            event->dest.client, event->dest.port);
802                 return -EMLINK;
803         }
804 
805         if (snd_seq_ev_is_variable(event) &&
806             snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
807                 return -EINVAL;
808 
809         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
810             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
811                 result = deliver_to_subscribers(client, event, atomic, hop);
812 #ifdef SUPPORT_BROADCAST
813         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
814                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
815                 result = broadcast_event(client, event, atomic, hop);
816         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
817                 result = multicast_event(client, event, atomic, hop);
818         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
819                 result = port_broadcast_event(client, event, atomic, hop);
820 #endif
821         else
822                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
823 
824         return result;
825 }
826 
827 /*
828  * dispatch an event cell:
829  * This function is called only from queue check routines in timer
830  * interrupts or after enqueued.
831  * The event cell shall be released or re-queued in this function.
832  *
833  * RETURN VALUE: n > 0  : the number of delivered events.
834  *               n == 0 : the event was not passed to any client.
835  *               n < 0  : error - event was not processed.
836  */
837 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
838 {
839         struct snd_seq_client *client;
840         int result;
841 
842         if (snd_BUG_ON(!cell))
843                 return -EINVAL;
844 
845         client = snd_seq_client_use_ptr(cell->event.source.client);
846         if (client == NULL) {
847                 snd_seq_cell_free(cell); /* release this cell */
848                 return -EINVAL;
849         }
850 
851         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
852                 /* NOTE event:
853                  * the event cell is re-used as a NOTE-OFF event and
854                  * enqueued again.
855                  */
856                 struct snd_seq_event tmpev, *ev;
857 
858                 /* reserve this event to enqueue note-off later */
859                 tmpev = cell->event;
860                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
861                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
862 
863                 /*
864                  * This was originally a note event.  We now re-use the
865                  * cell for the note-off event.
866                  */
867 
868                 ev = &cell->event;
869                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
870                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
871 
872                 /* add the duration time */
873                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
874                 case SNDRV_SEQ_TIME_STAMP_TICK:
875                         ev->time.tick += ev->data.note.duration;
876                         break;
877                 case SNDRV_SEQ_TIME_STAMP_REAL:
878                         /* unit for duration is ms */
879                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
880                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
881                                                 ev->time.time.tv_nsec / 1000000000;
882                         ev->time.time.tv_nsec %= 1000000000;
883                         break;
884                 }
885                 ev->data.note.velocity = ev->data.note.off_velocity;
886 
887                 /* Now queue this cell as the note off event */
888                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
889                         snd_seq_cell_free(cell); /* release this cell */
890 
891         } else {
892                 /* Normal events:
893                  * event cell is freed after processing the event
894                  */
895 
896                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
897                 snd_seq_cell_free(cell);
898         }
899 
900         snd_seq_client_unlock(client);
901         return result;
902 }
903 
904 
905 /* Allocate a cell from client pool and enqueue it to queue:
906  * if pool is empty and blocking is TRUE, sleep until a new cell is
907  * available.
908  */
909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
910                                         struct snd_seq_event *event,
911                                         struct file *file, int blocking,
912                                         int atomic, int hop,
913                                         struct mutex *mutexp)
914 {
915         struct snd_seq_event_cell *cell;
916         int err;
917 
918         /* special queue values - force direct passing */
919         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
920                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
921                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922         } else
923 #ifdef SUPPORT_BROADCAST
924                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
925                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
926                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927                 }
928 #endif
929         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930                 /* check presence of source port */
931                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
932                 if (src_port == NULL)
933                         return -EINVAL;
934                 snd_seq_port_unlock(src_port);
935         }
936 
937         /* direct event processing without enqueued */
938         if (snd_seq_ev_is_direct(event)) {
939                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
940                         return -EINVAL; /* this event must be enqueued! */
941                 return snd_seq_deliver_event(client, event, atomic, hop);
942         }
943 
944         /* Not direct, normal queuing */
945         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
946                 return -EINVAL;  /* invalid queue */
947         if (! snd_seq_write_pool_allocated(client))
948                 return -ENXIO; /* queue is not allocated */
949 
950         /* allocate an event cell */
951         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
952                                 file, mutexp);
953         if (err < 0)
954                 return err;
955 
956         /* we got a cell. enqueue it. */
957         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
958                 snd_seq_cell_free(cell);
959                 return err;
960         }
961 
962         return 0;
963 }
964 
965 
966 /*
967  * check validity of event type and data length.
968  * return non-zero if invalid.
969  */
970 static int check_event_type_and_length(struct snd_seq_event *ev)
971 {
972         switch (snd_seq_ev_length_type(ev)) {
973         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
974                 if (snd_seq_ev_is_variable_type(ev))
975                         return -EINVAL;
976                 break;
977         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
978                 if (! snd_seq_ev_is_variable_type(ev) ||
979                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
980                         return -EINVAL;
981                 break;
982         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
983                 if (! snd_seq_ev_is_direct(ev))
984                         return -EINVAL;
985                 break;
986         }
987         return 0;
988 }
989 
990 
991 /* handle write() */
992 /* possible error values:
993  *      -ENXIO  invalid client or file open mode
994  *      -ENOMEM malloc failed
995  *      -EFAULT seg. fault during copy from user space
996  *      -EINVAL invalid event
997  *      -EAGAIN no space in output pool
998  *      -EINTR  interrupts while sleep
999  *      -EMLINK too many hops
1000  *      others  depends on return value from driver callback
1001  */
1002 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1003                              size_t count, loff_t *offset)
1004 {
1005         struct snd_seq_client *client = file->private_data;
1006         int written = 0, len;
1007         int err;
1008         struct snd_seq_event event;
1009 
1010         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1011                 return -ENXIO;
1012 
1013         /* check client structures are in place */
1014         if (snd_BUG_ON(!client))
1015                 return -ENXIO;
1016                 
1017         if (!client->accept_output || client->pool == NULL)
1018                 return -ENXIO;
1019 
1020         /* allocate the pool now if the pool is not allocated yet */ 
1021         mutex_lock(&client->ioctl_mutex);
1022         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1023                 err = snd_seq_pool_init(client->pool);
1024                 if (err < 0)
1025                         goto out;
1026         }
1027 
1028         /* only process whole events */
1029         err = -EINVAL;
1030         while (count >= sizeof(struct snd_seq_event)) {
1031                 /* Read in the event header from the user */
1032                 len = sizeof(event);
1033                 if (copy_from_user(&event, buf, len)) {
1034                         err = -EFAULT;
1035                         break;
1036                 }
1037                 event.source.client = client->number;   /* fill in client number */
1038                 /* Check for extension data length */
1039                 if (check_event_type_and_length(&event)) {
1040                         err = -EINVAL;
1041                         break;
1042                 }
1043 
1044                 /* check for special events */
1045                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1046                         goto __skip_event;
1047                 else if (snd_seq_ev_is_reserved(&event)) {
1048                         err = -EINVAL;
1049                         break;
1050                 }
1051 
1052                 if (snd_seq_ev_is_variable(&event)) {
1053                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1054                         if ((size_t)(extlen + len) > count) {
1055                                 /* back out, will get an error this time or next */
1056                                 err = -EINVAL;
1057                                 break;
1058                         }
1059                         /* set user space pointer */
1060                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1061                         event.data.ext.ptr = (char __force *)buf
1062                                                 + sizeof(struct snd_seq_event);
1063                         len += extlen; /* increment data length */
1064                 } else {
1065 #ifdef CONFIG_COMPAT
1066                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1067                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1068                                 event.data.ext.ptr = ptr;
1069                         }
1070 #endif
1071                 }
1072 
1073                 /* ok, enqueue it */
1074                 err = snd_seq_client_enqueue_event(client, &event, file,
1075                                                    !(file->f_flags & O_NONBLOCK),
1076                                                    0, 0, &client->ioctl_mutex);
1077                 if (err < 0)
1078                         break;
1079 
1080         __skip_event:
1081                 /* Update pointers and counts */
1082                 count -= len;
1083                 buf += len;
1084                 written += len;
1085         }
1086 
1087  out:
1088         mutex_unlock(&client->ioctl_mutex);
1089         return written ? written : err;
1090 }
1091 
1092 
1093 /*
1094  * handle polling
1095  */
1096 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1097 {
1098         struct snd_seq_client *client = file->private_data;
1099         __poll_t mask = 0;
1100 
1101         /* check client structures are in place */
1102         if (snd_BUG_ON(!client))
1103                 return EPOLLERR;
1104 
1105         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1106             client->data.user.fifo) {
1107 
1108                 /* check if data is available in the outqueue */
1109                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1110                         mask |= EPOLLIN | EPOLLRDNORM;
1111         }
1112 
1113         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1114 
1115                 /* check if data is available in the pool */
1116                 if (!snd_seq_write_pool_allocated(client) ||
1117                     snd_seq_pool_poll_wait(client->pool, file, wait))
1118                         mask |= EPOLLOUT | EPOLLWRNORM;
1119         }
1120 
1121         return mask;
1122 }
1123 
1124 
1125 /*-----------------------------------------------------*/
1126 
1127 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1128 {
1129         int *pversion = arg;
1130 
1131         *pversion = SNDRV_SEQ_VERSION;
1132         return 0;
1133 }
1134 
1135 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1136 {
1137         int *client_id = arg;
1138 
1139         *client_id = client->number;
1140         return 0;
1141 }
1142 
1143 /* SYSTEM_INFO ioctl() */
1144 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1145 {
1146         struct snd_seq_system_info *info = arg;
1147 
1148         memset(info, 0, sizeof(*info));
1149         /* fill the info fields */
1150         info->queues = SNDRV_SEQ_MAX_QUEUES;
1151         info->clients = SNDRV_SEQ_MAX_CLIENTS;
1152         info->ports = SNDRV_SEQ_MAX_PORTS;
1153         info->channels = 256;   /* fixed limit */
1154         info->cur_clients = client_usage.cur;
1155         info->cur_queues = snd_seq_queue_get_cur_queues();
1156 
1157         return 0;
1158 }
1159 
1160 
1161 /* RUNNING_MODE ioctl() */
1162 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void  *arg)
1163 {
1164         struct snd_seq_running_info *info = arg;
1165         struct snd_seq_client *cptr;
1166         int err = 0;
1167 
1168         /* requested client number */
1169         cptr = snd_seq_client_use_ptr(info->client);
1170         if (cptr == NULL)
1171                 return -ENOENT;         /* don't change !!! */
1172 
1173 #ifdef SNDRV_BIG_ENDIAN
1174         if (!info->big_endian) {
1175                 err = -EINVAL;
1176                 goto __err;
1177         }
1178 #else
1179         if (info->big_endian) {
1180                 err = -EINVAL;
1181                 goto __err;
1182         }
1183 
1184 #endif
1185         if (info->cpu_mode > sizeof(long)) {
1186                 err = -EINVAL;
1187                 goto __err;
1188         }
1189         cptr->convert32 = (info->cpu_mode < sizeof(long));
1190  __err:
1191         snd_seq_client_unlock(cptr);
1192         return err;
1193 }
1194 
1195 /* CLIENT_INFO ioctl() */
1196 static void get_client_info(struct snd_seq_client *cptr,
1197                             struct snd_seq_client_info *info)
1198 {
1199         info->client = cptr->number;
1200 
1201         /* fill the info fields */
1202         info->type = cptr->type;
1203         strcpy(info->name, cptr->name);
1204         info->filter = cptr->filter;
1205         info->event_lost = cptr->event_lost;
1206         memcpy(info->event_filter, cptr->event_filter, 32);
1207         info->num_ports = cptr->num_ports;
1208 
1209         if (cptr->type == USER_CLIENT)
1210                 info->pid = pid_vnr(cptr->data.user.owner);
1211         else
1212                 info->pid = -1;
1213 
1214         if (cptr->type == KERNEL_CLIENT)
1215                 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1216         else
1217                 info->card = -1;
1218 
1219         memset(info->reserved, 0, sizeof(info->reserved));
1220 }
1221 
1222 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1223                                          void *arg)
1224 {
1225         struct snd_seq_client_info *client_info = arg;
1226         struct snd_seq_client *cptr;
1227 
1228         /* requested client number */
1229         cptr = snd_seq_client_use_ptr(client_info->client);
1230         if (cptr == NULL)
1231                 return -ENOENT;         /* don't change !!! */
1232 
1233         get_client_info(cptr, client_info);
1234         snd_seq_client_unlock(cptr);
1235 
1236         return 0;
1237 }
1238 
1239 
1240 /* CLIENT_INFO ioctl() */
1241 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1242                                          void *arg)
1243 {
1244         struct snd_seq_client_info *client_info = arg;
1245 
1246         /* it is not allowed to set the info fields for an another client */
1247         if (client->number != client_info->client)
1248                 return -EPERM;
1249         /* also client type must be set now */
1250         if (client->type != client_info->type)
1251                 return -EINVAL;
1252 
1253         /* fill the info fields */
1254         if (client_info->name[0])
1255                 strlcpy(client->name, client_info->name, sizeof(client->name));
1256 
1257         client->filter = client_info->filter;
1258         client->event_lost = client_info->event_lost;
1259         memcpy(client->event_filter, client_info->event_filter, 32);
1260 
1261         return 0;
1262 }
1263 
1264 
1265 /* 
1266  * CREATE PORT ioctl() 
1267  */
1268 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1269 {
1270         struct snd_seq_port_info *info = arg;
1271         struct snd_seq_client_port *port;
1272         struct snd_seq_port_callback *callback;
1273         int port_idx;
1274 
1275         /* it is not allowed to create the port for an another client */
1276         if (info->addr.client != client->number)
1277                 return -EPERM;
1278 
1279         port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1280         if (port == NULL)
1281                 return -ENOMEM;
1282 
1283         if (client->type == USER_CLIENT && info->kernel) {
1284                 port_idx = port->addr.port;
1285                 snd_seq_port_unlock(port);
1286                 snd_seq_delete_port(client, port_idx);
1287                 return -EINVAL;
1288         }
1289         if (client->type == KERNEL_CLIENT) {
1290                 if ((callback = info->kernel) != NULL) {
1291                         if (callback->owner)
1292                                 port->owner = callback->owner;
1293                         port->private_data = callback->private_data;
1294                         port->private_free = callback->private_free;
1295                         port->event_input = callback->event_input;
1296                         port->c_src.open = callback->subscribe;
1297                         port->c_src.close = callback->unsubscribe;
1298                         port->c_dest.open = callback->use;
1299                         port->c_dest.close = callback->unuse;
1300                 }
1301         }
1302 
1303         info->addr = port->addr;
1304 
1305         snd_seq_set_port_info(port, info);
1306         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1307         snd_seq_port_unlock(port);
1308 
1309         return 0;
1310 }
1311 
1312 /* 
1313  * DELETE PORT ioctl() 
1314  */
1315 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1316 {
1317         struct snd_seq_port_info *info = arg;
1318         int err;
1319 
1320         /* it is not allowed to remove the port for an another client */
1321         if (info->addr.client != client->number)
1322                 return -EPERM;
1323 
1324         err = snd_seq_delete_port(client, info->addr.port);
1325         if (err >= 0)
1326                 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1327         return err;
1328 }
1329 
1330 
1331 /* 
1332  * GET_PORT_INFO ioctl() (on any client) 
1333  */
1334 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1335 {
1336         struct snd_seq_port_info *info = arg;
1337         struct snd_seq_client *cptr;
1338         struct snd_seq_client_port *port;
1339 
1340         cptr = snd_seq_client_use_ptr(info->addr.client);
1341         if (cptr == NULL)
1342                 return -ENXIO;
1343 
1344         port = snd_seq_port_use_ptr(cptr, info->addr.port);
1345         if (port == NULL) {
1346                 snd_seq_client_unlock(cptr);
1347                 return -ENOENT;                 /* don't change */
1348         }
1349 
1350         /* get port info */
1351         snd_seq_get_port_info(port, info);
1352         snd_seq_port_unlock(port);
1353         snd_seq_client_unlock(cptr);
1354 
1355         return 0;
1356 }
1357 
1358 
1359 /* 
1360  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1361  */
1362 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1363 {
1364         struct snd_seq_port_info *info = arg;
1365         struct snd_seq_client_port *port;
1366 
1367         if (info->addr.client != client->number) /* only set our own ports ! */
1368                 return -EPERM;
1369         port = snd_seq_port_use_ptr(client, info->addr.port);
1370         if (port) {
1371                 snd_seq_set_port_info(port, info);
1372                 snd_seq_port_unlock(port);
1373         }
1374         return 0;
1375 }
1376 
1377 
1378 /*
1379  * port subscription (connection)
1380  */
1381 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1382 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1383 
1384 static int check_subscription_permission(struct snd_seq_client *client,
1385                                          struct snd_seq_client_port *sport,
1386                                          struct snd_seq_client_port *dport,
1387                                          struct snd_seq_port_subscribe *subs)
1388 {
1389         if (client->number != subs->sender.client &&
1390             client->number != subs->dest.client) {
1391                 /* connection by third client - check export permission */
1392                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1393                         return -EPERM;
1394                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1395                         return -EPERM;
1396         }
1397 
1398         /* check read permission */
1399         /* if sender or receiver is the subscribing client itself,
1400          * no permission check is necessary
1401          */
1402         if (client->number != subs->sender.client) {
1403                 if (! check_port_perm(sport, PERM_RD))
1404                         return -EPERM;
1405         }
1406         /* check write permission */
1407         if (client->number != subs->dest.client) {
1408                 if (! check_port_perm(dport, PERM_WR))
1409                         return -EPERM;
1410         }
1411         return 0;
1412 }
1413 
1414 /*
1415  * send an subscription notify event to user client:
1416  * client must be user client.
1417  */
1418 int snd_seq_client_notify_subscription(int client, int port,
1419                                        struct snd_seq_port_subscribe *info,
1420                                        int evtype)
1421 {
1422         struct snd_seq_event event;
1423 
1424         memset(&event, 0, sizeof(event));
1425         event.type = evtype;
1426         event.data.connect.dest = info->dest;
1427         event.data.connect.sender = info->sender;
1428 
1429         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1430 }
1431 
1432 
1433 /* 
1434  * add to port's subscription list IOCTL interface 
1435  */
1436 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1437                                         void *arg)
1438 {
1439         struct snd_seq_port_subscribe *subs = arg;
1440         int result = -EINVAL;
1441         struct snd_seq_client *receiver = NULL, *sender = NULL;
1442         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1443 
1444         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1445                 goto __end;
1446         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1447                 goto __end;
1448         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1449                 goto __end;
1450         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1451                 goto __end;
1452 
1453         result = check_subscription_permission(client, sport, dport, subs);
1454         if (result < 0)
1455                 goto __end;
1456 
1457         /* connect them */
1458         result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1459         if (! result) /* broadcast announce */
1460                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1461                                                    subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1462       __end:
1463         if (sport)
1464                 snd_seq_port_unlock(sport);
1465         if (dport)
1466                 snd_seq_port_unlock(dport);
1467         if (sender)
1468                 snd_seq_client_unlock(sender);
1469         if (receiver)
1470                 snd_seq_client_unlock(receiver);
1471         return result;
1472 }
1473 
1474 
1475 /* 
1476  * remove from port's subscription list 
1477  */
1478 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1479                                           void *arg)
1480 {
1481         struct snd_seq_port_subscribe *subs = arg;
1482         int result = -ENXIO;
1483         struct snd_seq_client *receiver = NULL, *sender = NULL;
1484         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1485 
1486         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1487                 goto __end;
1488         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1489                 goto __end;
1490         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1491                 goto __end;
1492         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1493                 goto __end;
1494 
1495         result = check_subscription_permission(client, sport, dport, subs);
1496         if (result < 0)
1497                 goto __end;
1498 
1499         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1500         if (! result) /* broadcast announce */
1501                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1502                                                    subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1503       __end:
1504         if (sport)
1505                 snd_seq_port_unlock(sport);
1506         if (dport)
1507                 snd_seq_port_unlock(dport);
1508         if (sender)
1509                 snd_seq_client_unlock(sender);
1510         if (receiver)
1511                 snd_seq_client_unlock(receiver);
1512         return result;
1513 }
1514 
1515 
1516 /* CREATE_QUEUE ioctl() */
1517 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1518 {
1519         struct snd_seq_queue_info *info = arg;
1520         struct snd_seq_queue *q;
1521 
1522         q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1523         if (IS_ERR(q))
1524                 return PTR_ERR(q);
1525 
1526         info->queue = q->queue;
1527         info->locked = q->locked;
1528         info->owner = q->owner;
1529 
1530         /* set queue name */
1531         if (!info->name[0])
1532                 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1533         strlcpy(q->name, info->name, sizeof(q->name));
1534         snd_use_lock_free(&q->use_lock);
1535 
1536         return 0;
1537 }
1538 
1539 /* DELETE_QUEUE ioctl() */
1540 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1541 {
1542         struct snd_seq_queue_info *info = arg;
1543 
1544         return snd_seq_queue_delete(client->number, info->queue);
1545 }
1546 
1547 /* GET_QUEUE_INFO ioctl() */
1548 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1549                                         void *arg)
1550 {
1551         struct snd_seq_queue_info *info = arg;
1552         struct snd_seq_queue *q;
1553 
1554         q = queueptr(info->queue);
1555         if (q == NULL)
1556                 return -EINVAL;
1557 
1558         memset(info, 0, sizeof(*info));
1559         info->queue = q->queue;
1560         info->owner = q->owner;
1561         info->locked = q->locked;
1562         strlcpy(info->name, q->name, sizeof(info->name));
1563         queuefree(q);
1564 
1565         return 0;
1566 }
1567 
1568 /* SET_QUEUE_INFO ioctl() */
1569 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1570                                         void *arg)
1571 {
1572         struct snd_seq_queue_info *info = arg;
1573         struct snd_seq_queue *q;
1574 
1575         if (info->owner != client->number)
1576                 return -EINVAL;
1577 
1578         /* change owner/locked permission */
1579         if (snd_seq_queue_check_access(info->queue, client->number)) {
1580                 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1581                         return -EPERM;
1582                 if (info->locked)
1583                         snd_seq_queue_use(info->queue, client->number, 1);
1584         } else {
1585                 return -EPERM;
1586         }       
1587 
1588         q = queueptr(info->queue);
1589         if (! q)
1590                 return -EINVAL;
1591         if (q->owner != client->number) {
1592                 queuefree(q);
1593                 return -EPERM;
1594         }
1595         strlcpy(q->name, info->name, sizeof(q->name));
1596         queuefree(q);
1597 
1598         return 0;
1599 }
1600 
1601 /* GET_NAMED_QUEUE ioctl() */
1602 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1603                                          void *arg)
1604 {
1605         struct snd_seq_queue_info *info = arg;
1606         struct snd_seq_queue *q;
1607 
1608         q = snd_seq_queue_find_name(info->name);
1609         if (q == NULL)
1610                 return -EINVAL;
1611         info->queue = q->queue;
1612         info->owner = q->owner;
1613         info->locked = q->locked;
1614         queuefree(q);
1615 
1616         return 0;
1617 }
1618 
1619 /* GET_QUEUE_STATUS ioctl() */
1620 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1621                                           void *arg)
1622 {
1623         struct snd_seq_queue_status *status = arg;
1624         struct snd_seq_queue *queue;
1625         struct snd_seq_timer *tmr;
1626 
1627         queue = queueptr(status->queue);
1628         if (queue == NULL)
1629                 return -EINVAL;
1630         memset(status, 0, sizeof(*status));
1631         status->queue = queue->queue;
1632         
1633         tmr = queue->timer;
1634         status->events = queue->tickq->cells + queue->timeq->cells;
1635 
1636         status->time = snd_seq_timer_get_cur_time(tmr);
1637         status->tick = snd_seq_timer_get_cur_tick(tmr);
1638 
1639         status->running = tmr->running;
1640 
1641         status->flags = queue->flags;
1642         queuefree(queue);
1643 
1644         return 0;
1645 }
1646 
1647 
1648 /* GET_QUEUE_TEMPO ioctl() */
1649 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1650                                          void *arg)
1651 {
1652         struct snd_seq_queue_tempo *tempo = arg;
1653         struct snd_seq_queue *queue;
1654         struct snd_seq_timer *tmr;
1655 
1656         queue = queueptr(tempo->queue);
1657         if (queue == NULL)
1658                 return -EINVAL;
1659         memset(tempo, 0, sizeof(*tempo));
1660         tempo->queue = queue->queue;
1661         
1662         tmr = queue->timer;
1663 
1664         tempo->tempo = tmr->tempo;
1665         tempo->ppq = tmr->ppq;
1666         tempo->skew_value = tmr->skew;
1667         tempo->skew_base = tmr->skew_base;
1668         queuefree(queue);
1669 
1670         return 0;
1671 }
1672 
1673 
1674 /* SET_QUEUE_TEMPO ioctl() */
1675 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1676 {
1677         if (!snd_seq_queue_check_access(tempo->queue, client))
1678                 return -EPERM;
1679         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1680 }
1681 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1682 
1683 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1684                                          void *arg)
1685 {
1686         struct snd_seq_queue_tempo *tempo = arg;
1687         int result;
1688 
1689         result = snd_seq_set_queue_tempo(client->number, tempo);
1690         return result < 0 ? result : 0;
1691 }
1692 
1693 
1694 /* GET_QUEUE_TIMER ioctl() */
1695 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1696                                          void *arg)
1697 {
1698         struct snd_seq_queue_timer *timer = arg;
1699         struct snd_seq_queue *queue;
1700         struct snd_seq_timer *tmr;
1701 
1702         queue = queueptr(timer->queue);
1703         if (queue == NULL)
1704                 return -EINVAL;
1705 
1706         mutex_lock(&queue->timer_mutex);
1707         tmr = queue->timer;
1708         memset(timer, 0, sizeof(*timer));
1709         timer->queue = queue->queue;
1710 
1711         timer->type = tmr->type;
1712         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1713                 timer->u.alsa.id = tmr->alsa_id;
1714                 timer->u.alsa.resolution = tmr->preferred_resolution;
1715         }
1716         mutex_unlock(&queue->timer_mutex);
1717         queuefree(queue);
1718         
1719         return 0;
1720 }
1721 
1722 
1723 /* SET_QUEUE_TIMER ioctl() */
1724 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1725                                          void *arg)
1726 {
1727         struct snd_seq_queue_timer *timer = arg;
1728         int result = 0;
1729 
1730         if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1731                 return -EINVAL;
1732 
1733         if (snd_seq_queue_check_access(timer->queue, client->number)) {
1734                 struct snd_seq_queue *q;
1735                 struct snd_seq_timer *tmr;
1736 
1737                 q = queueptr(timer->queue);
1738                 if (q == NULL)
1739                         return -ENXIO;
1740                 mutex_lock(&q->timer_mutex);
1741                 tmr = q->timer;
1742                 snd_seq_queue_timer_close(timer->queue);
1743                 tmr->type = timer->type;
1744                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1745                         tmr->alsa_id = timer->u.alsa.id;
1746                         tmr->preferred_resolution = timer->u.alsa.resolution;
1747                 }
1748                 result = snd_seq_queue_timer_open(timer->queue);
1749                 mutex_unlock(&q->timer_mutex);
1750                 queuefree(q);
1751         } else {
1752                 return -EPERM;
1753         }       
1754 
1755         return result;
1756 }
1757 
1758 
1759 /* GET_QUEUE_CLIENT ioctl() */
1760 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1761                                           void *arg)
1762 {
1763         struct snd_seq_queue_client *info = arg;
1764         int used;
1765 
1766         used = snd_seq_queue_is_used(info->queue, client->number);
1767         if (used < 0)
1768                 return -EINVAL;
1769         info->used = used;
1770         info->client = client->number;
1771 
1772         return 0;
1773 }
1774 
1775 
1776 /* SET_QUEUE_CLIENT ioctl() */
1777 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1778                                           void *arg)
1779 {
1780         struct snd_seq_queue_client *info = arg;
1781         int err;
1782 
1783         if (info->used >= 0) {
1784                 err = snd_seq_queue_use(info->queue, client->number, info->used);
1785                 if (err < 0)
1786                         return err;
1787         }
1788 
1789         return snd_seq_ioctl_get_queue_client(client, arg);
1790 }
1791 
1792 
1793 /* GET_CLIENT_POOL ioctl() */
1794 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1795                                          void *arg)
1796 {
1797         struct snd_seq_client_pool *info = arg;
1798         struct snd_seq_client *cptr;
1799 
1800         cptr = snd_seq_client_use_ptr(info->client);
1801         if (cptr == NULL)
1802                 return -ENOENT;
1803         memset(info, 0, sizeof(*info));
1804         info->client = cptr->number;
1805         info->output_pool = cptr->pool->size;
1806         info->output_room = cptr->pool->room;
1807         info->output_free = info->output_pool;
1808         info->output_free = snd_seq_unused_cells(cptr->pool);
1809         if (cptr->type == USER_CLIENT) {
1810                 info->input_pool = cptr->data.user.fifo_pool_size;
1811                 info->input_free = info->input_pool;
1812                 if (cptr->data.user.fifo)
1813                         info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1814         } else {
1815                 info->input_pool = 0;
1816                 info->input_free = 0;
1817         }
1818         snd_seq_client_unlock(cptr);
1819         
1820         return 0;
1821 }
1822 
1823 /* SET_CLIENT_POOL ioctl() */
1824 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1825                                          void *arg)
1826 {
1827         struct snd_seq_client_pool *info = arg;
1828         int rc;
1829 
1830         if (client->number != info->client)
1831                 return -EINVAL; /* can't change other clients */
1832 
1833         if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1834             (! snd_seq_write_pool_allocated(client) ||
1835              info->output_pool != client->pool->size)) {
1836                 if (snd_seq_write_pool_allocated(client)) {
1837                         /* is the pool in use? */
1838                         if (atomic_read(&client->pool->counter))
1839                                 return -EBUSY;
1840                         /* remove all existing cells */
1841                         snd_seq_pool_mark_closing(client->pool);
1842                         snd_seq_pool_done(client->pool);
1843                 }
1844                 client->pool->size = info->output_pool;
1845                 rc = snd_seq_pool_init(client->pool);
1846                 if (rc < 0)
1847                         return rc;
1848         }
1849         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1850             info->input_pool >= 1 &&
1851             info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1852             info->input_pool != client->data.user.fifo_pool_size) {
1853                 /* change pool size */
1854                 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1855                 if (rc < 0)
1856                         return rc;
1857                 client->data.user.fifo_pool_size = info->input_pool;
1858         }
1859         if (info->output_room >= 1 &&
1860             info->output_room <= client->pool->size) {
1861                 client->pool->room  = info->output_room;
1862         }
1863 
1864         return snd_seq_ioctl_get_client_pool(client, arg);
1865 }
1866 
1867 
1868 /* REMOVE_EVENTS ioctl() */
1869 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1870                                        void *arg)
1871 {
1872         struct snd_seq_remove_events *info = arg;
1873 
1874         /*
1875          * Input mostly not implemented XXX.
1876          */
1877         if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1878                 /*
1879                  * No restrictions so for a user client we can clear
1880                  * the whole fifo
1881                  */
1882                 if (client->type == USER_CLIENT && client->data.user.fifo)
1883                         snd_seq_fifo_clear(client->data.user.fifo);
1884         }
1885 
1886         if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1887                 snd_seq_queue_remove_cells(client->number, info);
1888 
1889         return 0;
1890 }
1891 
1892 
1893 /*
1894  * get subscription info
1895  */
1896 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1897                                           void *arg)
1898 {
1899         struct snd_seq_port_subscribe *subs = arg;
1900         int result;
1901         struct snd_seq_client *sender = NULL;
1902         struct snd_seq_client_port *sport = NULL;
1903         struct snd_seq_subscribers *p;
1904 
1905         result = -EINVAL;
1906         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1907                 goto __end;
1908         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1909                 goto __end;
1910         p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1911         if (p) {
1912                 result = 0;
1913                 *subs = p->info;
1914         } else
1915                 result = -ENOENT;
1916 
1917       __end:
1918         if (sport)
1919                 snd_seq_port_unlock(sport);
1920         if (sender)
1921                 snd_seq_client_unlock(sender);
1922 
1923         return result;
1924 }
1925 
1926 
1927 /*
1928  * get subscription info - check only its presence
1929  */
1930 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1931 {
1932         struct snd_seq_query_subs *subs = arg;
1933         int result = -ENXIO;
1934         struct snd_seq_client *cptr = NULL;
1935         struct snd_seq_client_port *port = NULL;
1936         struct snd_seq_port_subs_info *group;
1937         struct list_head *p;
1938         int i;
1939 
1940         if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1941                 goto __end;
1942         if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1943                 goto __end;
1944 
1945         switch (subs->type) {
1946         case SNDRV_SEQ_QUERY_SUBS_READ:
1947                 group = &port->c_src;
1948                 break;
1949         case SNDRV_SEQ_QUERY_SUBS_WRITE:
1950                 group = &port->c_dest;
1951                 break;
1952         default:
1953                 goto __end;
1954         }
1955 
1956         down_read(&group->list_mutex);
1957         /* search for the subscriber */
1958         subs->num_subs = group->count;
1959         i = 0;
1960         result = -ENOENT;
1961         list_for_each(p, &group->list_head) {
1962                 if (i++ == subs->index) {
1963                         /* found! */
1964                         struct snd_seq_subscribers *s;
1965                         if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1966                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
1967                                 subs->addr = s->info.dest;
1968                         } else {
1969                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1970                                 subs->addr = s->info.sender;
1971                         }
1972                         subs->flags = s->info.flags;
1973                         subs->queue = s->info.queue;
1974                         result = 0;
1975                         break;
1976                 }
1977         }
1978         up_read(&group->list_mutex);
1979 
1980       __end:
1981         if (port)
1982                 snd_seq_port_unlock(port);
1983         if (cptr)
1984                 snd_seq_client_unlock(cptr);
1985 
1986         return result;
1987 }
1988 
1989 
1990 /*
1991  * query next client
1992  */
1993 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1994                                            void *arg)
1995 {
1996         struct snd_seq_client_info *info = arg;
1997         struct snd_seq_client *cptr = NULL;
1998 
1999         /* search for next client */
2000         if (info->client < INT_MAX)
2001                 info->client++;
2002         if (info->client < 0)
2003                 info->client = 0;
2004         for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2005                 cptr = snd_seq_client_use_ptr(info->client);
2006                 if (cptr)
2007                         break; /* found */
2008         }
2009         if (cptr == NULL)
2010                 return -ENOENT;
2011 
2012         get_client_info(cptr, info);
2013         snd_seq_client_unlock(cptr);
2014 
2015         return 0;
2016 }
2017 
2018 /* 
2019  * query next port
2020  */
2021 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2022                                          void *arg)
2023 {
2024         struct snd_seq_port_info *info = arg;
2025         struct snd_seq_client *cptr;
2026         struct snd_seq_client_port *port = NULL;
2027 
2028         cptr = snd_seq_client_use_ptr(info->addr.client);
2029         if (cptr == NULL)
2030                 return -ENXIO;
2031 
2032         /* search for next port */
2033         info->addr.port++;
2034         port = snd_seq_port_query_nearest(cptr, info);
2035         if (port == NULL) {
2036                 snd_seq_client_unlock(cptr);
2037                 return -ENOENT;
2038         }
2039 
2040         /* get port info */
2041         info->addr = port->addr;
2042         snd_seq_get_port_info(port, info);
2043         snd_seq_port_unlock(port);
2044         snd_seq_client_unlock(cptr);
2045 
2046         return 0;
2047 }
2048 
2049 /* -------------------------------------------------------- */
2050 
2051 static const struct ioctl_handler {
2052         unsigned int cmd;
2053         int (*func)(struct snd_seq_client *client, void *arg);
2054 } ioctl_handlers[] = {
2055         { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2056         { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2057         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2058         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2059         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2060         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2061         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2062         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2063         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2064         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2065         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2066         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2067         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2068         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2069         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2070         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2071         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2072         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2073         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2074         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2075         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2076         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2077         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2078         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2079         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2080         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2081         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2082         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2083         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2084         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2085         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2086         { 0, NULL },
2087 };
2088 
2089 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2090                           unsigned long arg)
2091 {
2092         struct snd_seq_client *client = file->private_data;
2093         /* To use kernel stack for ioctl data. */
2094         union {
2095                 int pversion;
2096                 int client_id;
2097                 struct snd_seq_system_info      system_info;
2098                 struct snd_seq_running_info     running_info;
2099                 struct snd_seq_client_info      client_info;
2100                 struct snd_seq_port_info        port_info;
2101                 struct snd_seq_port_subscribe   port_subscribe;
2102                 struct snd_seq_queue_info       queue_info;
2103                 struct snd_seq_queue_status     queue_status;
2104                 struct snd_seq_queue_tempo      tempo;
2105                 struct snd_seq_queue_timer      queue_timer;
2106                 struct snd_seq_queue_client     queue_client;
2107                 struct snd_seq_client_pool      client_pool;
2108                 struct snd_seq_remove_events    remove_events;
2109                 struct snd_seq_query_subs       query_subs;
2110         } buf;
2111         const struct ioctl_handler *handler;
2112         unsigned long size;
2113         int err;
2114 
2115         if (snd_BUG_ON(!client))
2116                 return -ENXIO;
2117 
2118         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2119                 if (handler->cmd == cmd)
2120                         break;
2121         }
2122         if (handler->cmd == 0)
2123                 return -ENOTTY;
2124 
2125         memset(&buf, 0, sizeof(buf));
2126 
2127         /*
2128          * All of ioctl commands for ALSA sequencer get an argument of size
2129          * within 13 bits. We can safely pick up the size from the command.
2130          */
2131         size = _IOC_SIZE(handler->cmd);
2132         if (handler->cmd & IOC_IN) {
2133                 if (copy_from_user(&buf, (const void __user *)arg, size))
2134                         return -EFAULT;
2135         }
2136 
2137         mutex_lock(&client->ioctl_mutex);
2138         err = handler->func(client, &buf);
2139         mutex_unlock(&client->ioctl_mutex);
2140         if (err >= 0) {
2141                 /* Some commands includes a bug in 'dir' field. */
2142                 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2143                     handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2144                     (handler->cmd & IOC_OUT))
2145                         if (copy_to_user((void __user *)arg, &buf, size))
2146                                 return -EFAULT;
2147         }
2148 
2149         return err;
2150 }
2151 
2152 #ifdef CONFIG_COMPAT
2153 #include "seq_compat.c"
2154 #else
2155 #define snd_seq_ioctl_compat    NULL
2156 #endif
2157 
2158 /* -------------------------------------------------------- */
2159 
2160 
2161 /* exported to kernel modules */
2162 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2163                                  const char *name_fmt, ...)
2164 {
2165         struct snd_seq_client *client;
2166         va_list args;
2167 
2168         if (snd_BUG_ON(in_interrupt()))
2169                 return -EBUSY;
2170 
2171         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2172                 return -EINVAL;
2173         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2174                 return -EINVAL;
2175 
2176         mutex_lock(&register_mutex);
2177 
2178         if (card) {
2179                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2180                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2181                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2182                         client_index = -1;
2183         }
2184 
2185         /* empty write queue as default */
2186         client = seq_create_client1(client_index, 0);
2187         if (client == NULL) {
2188                 mutex_unlock(&register_mutex);
2189                 return -EBUSY;  /* failure code */
2190         }
2191         usage_alloc(&client_usage, 1);
2192 
2193         client->accept_input = 1;
2194         client->accept_output = 1;
2195         client->data.kernel.card = card;
2196                 
2197         va_start(args, name_fmt);
2198         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2199         va_end(args);
2200 
2201         client->type = KERNEL_CLIENT;
2202         mutex_unlock(&register_mutex);
2203 
2204         /* make others aware this new client */
2205         snd_seq_system_client_ev_client_start(client->number);
2206         
2207         /* return client number to caller */
2208         return client->number;
2209 }
2210 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2211 
2212 /* exported to kernel modules */
2213 int snd_seq_delete_kernel_client(int client)
2214 {
2215         struct snd_seq_client *ptr;
2216 
2217         if (snd_BUG_ON(in_interrupt()))
2218                 return -EBUSY;
2219 
2220         ptr = clientptr(client);
2221         if (ptr == NULL)
2222                 return -EINVAL;
2223 
2224         seq_free_client(ptr);
2225         kfree(ptr);
2226         return 0;
2227 }
2228 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2229 
2230 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2231  * and snd_seq_kernel_client_enqueue_blocking
2232  */
2233 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2234                                  struct file *file, int blocking,
2235                                  int atomic, int hop)
2236 {
2237         struct snd_seq_client *cptr;
2238         int result;
2239 
2240         if (snd_BUG_ON(!ev))
2241                 return -EINVAL;
2242 
2243         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2244                 return 0; /* ignore this */
2245         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2246                 return -EINVAL; /* quoted events can't be enqueued */
2247 
2248         /* fill in client number */
2249         ev->source.client = client;
2250 
2251         if (check_event_type_and_length(ev))
2252                 return -EINVAL;
2253 
2254         cptr = snd_seq_client_use_ptr(client);
2255         if (cptr == NULL)
2256                 return -EINVAL;
2257         
2258         if (! cptr->accept_output)
2259                 result = -EPERM;
2260         else /* send it */
2261                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2262                                                       atomic, hop, NULL);
2263 
2264         snd_seq_client_unlock(cptr);
2265         return result;
2266 }
2267 
2268 /*
2269  * exported, called by kernel clients to enqueue events (w/o blocking)
2270  *
2271  * RETURN VALUE: zero if succeed, negative if error
2272  */
2273 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2274                                   int atomic, int hop)
2275 {
2276         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2277 }
2278 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2279 
2280 /*
2281  * exported, called by kernel clients to enqueue events (with blocking)
2282  *
2283  * RETURN VALUE: zero if succeed, negative if error
2284  */
2285 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2286                                            struct file *file,
2287                                            int atomic, int hop)
2288 {
2289         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2290 }
2291 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
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 

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