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/slab.h>
  26#include <sound/core.h>
  27#include <sound/minors.h>
  28#include <linux/kmod.h>
  29
  30#include <sound/seq_kernel.h>
  31#include "seq_clientmgr.h"
  32#include "seq_memory.h"
  33#include "seq_queue.h"
  34#include "seq_timer.h"
  35#include "seq_info.h"
  36#include "seq_system.h"
  37#include <sound/seq_device.h>
  38#ifdef CONFIG_COMPAT
  39#include <linux/compat.h>
  40#endif
  41
  42/* Client Manager
  43
  44 * this module handles the connections of userland and kernel clients
  45 * 
  46 */
  47
  48/*
  49 * There are four ranges of client numbers (last two shared):
  50 * 0..15: global clients
  51 * 16..127: statically allocated client numbers for cards 0..27
  52 * 128..191: dynamically allocated client numbers for cards 28..31
  53 * 128..191: dynamically allocated client numbers for applications
  54 */
  55
  56/* number of kernel non-card clients */
  57#define SNDRV_SEQ_GLOBAL_CLIENTS	16
  58/* clients per cards, for static clients */
  59#define SNDRV_SEQ_CLIENTS_PER_CARD	4
  60/* dynamically allocated client numbers (both kernel drivers and user space) */
  61#define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN	128
  62
  63#define SNDRV_SEQ_LFLG_INPUT	0x0001
  64#define SNDRV_SEQ_LFLG_OUTPUT	0x0002
  65#define SNDRV_SEQ_LFLG_OPEN	(SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
  66
  67static DEFINE_SPINLOCK(clients_lock);
  68static DEFINE_MUTEX(register_mutex);
  69
  70/*
  71 * client table
  72 */
  73static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
  74static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
  75static struct snd_seq_usage client_usage;
  76
  77/*
  78 * prototypes
  79 */
  80static int bounce_error_event(struct snd_seq_client *client,
  81			      struct snd_seq_event *event,
  82			      int err, int atomic, int hop);
  83static int snd_seq_deliver_single_event(struct snd_seq_client *client,
  84					struct snd_seq_event *event,
  85					int filter, int atomic, int hop);
  86
  87/*
  88 */
  89 
  90static inline mm_segment_t snd_enter_user(void)
  91{
  92	mm_segment_t fs = get_fs();
  93	set_fs(get_ds());
  94	return fs;
  95}
  96
  97static inline void snd_leave_user(mm_segment_t fs)
  98{
  99	set_fs(fs);
 100}
 101
 102/*
 103 */
 104static inline unsigned short snd_seq_file_flags(struct file *file)
 105{
 106        switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
 107        case FMODE_WRITE:
 108                return SNDRV_SEQ_LFLG_OUTPUT;
 109        case FMODE_READ:
 110                return SNDRV_SEQ_LFLG_INPUT;
 111        default:
 112                return SNDRV_SEQ_LFLG_OPEN;
 113        }
 114}
 115
 116static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
 117{
 118	return snd_seq_total_cells(client->pool) > 0;
 119}
 120
 121/* return pointer to client structure for specified id */
 122static struct snd_seq_client *clientptr(int clientid)
 123{
 124	if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
 125		snd_printd("Seq: oops. Trying to get pointer to client %d\n",
 126			   clientid);
 127		return NULL;
 128	}
 129	return clienttab[clientid];
 130}
 131
 132struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
 133{
 134	unsigned long flags;
 135	struct snd_seq_client *client;
 136
 137	if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
 138		snd_printd("Seq: oops. Trying to get pointer to client %d\n",
 139			   clientid);
 140		return NULL;
 141	}
 142	spin_lock_irqsave(&clients_lock, flags);
 143	client = clientptr(clientid);
 144	if (client)
 145		goto __lock;
 146	if (clienttablock[clientid]) {
 147		spin_unlock_irqrestore(&clients_lock, flags);
 148		return NULL;
 149	}
 150	spin_unlock_irqrestore(&clients_lock, flags);
 151#ifdef CONFIG_MODULES
 152	if (!in_interrupt()) {
 153		static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
 154		static char card_requested[SNDRV_CARDS];
 155		if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
 156			int idx;
 157			
 158			if (!client_requested[clientid]) {
 159				client_requested[clientid] = 1;
 160				for (idx = 0; idx < 15; idx++) {
 161					if (seq_client_load[idx] < 0)
 162						break;
 163					if (seq_client_load[idx] == clientid) {
 164						request_module("snd-seq-client-%i",
 165							       clientid);
 166						break;
 167					}
 168				}
 169			}
 170		} else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
 171			int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
 172				SNDRV_SEQ_CLIENTS_PER_CARD;
 173			if (card < snd_ecards_limit) {
 174				if (! card_requested[card]) {
 175					card_requested[card] = 1;
 176					snd_request_card(card);
 177				}
 178				snd_seq_device_load_drivers();
 179			}
 180		}
 181		spin_lock_irqsave(&clients_lock, flags);
 182		client = clientptr(clientid);
 183		if (client)
 184			goto __lock;
 185		spin_unlock_irqrestore(&clients_lock, flags);
 186	}
 187#endif
 188	return NULL;
 189
 190      __lock:
 191	snd_use_lock_use(&client->use_lock);
 192	spin_unlock_irqrestore(&clients_lock, flags);
 193	return client;
 194}
 195
 196static void usage_alloc(struct snd_seq_usage *res, int num)
 197{
 198	res->cur += num;
 199	if (res->cur > res->peak)
 200		res->peak = res->cur;
 201}
 202
 203static void usage_free(struct snd_seq_usage *res, int num)
 204{
 205	res->cur -= num;
 206}
 207
 208/* initialise data structures */
 209int __init client_init_data(void)
 210{
 211	/* zap out the client table */
 212	memset(&clienttablock, 0, sizeof(clienttablock));
 213	memset(&clienttab, 0, sizeof(clienttab));
 214	return 0;
 215}
 216
 217
 218static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
 219{
 220	unsigned long flags;
 221	int c;
 222	struct snd_seq_client *client;
 223
 224	/* init client data */
 225	client = kzalloc(sizeof(*client), GFP_KERNEL);
 226	if (client == NULL)
 227		return NULL;
 228	client->pool = snd_seq_pool_new(poolsize);
 229	if (client->pool == NULL) {
 230		kfree(client);
 231		return NULL;
 232	}
 233	client->type = NO_CLIENT;
 234	snd_use_lock_init(&client->use_lock);
 235	rwlock_init(&client->ports_lock);
 236	mutex_init(&client->ports_mutex);
 237	INIT_LIST_HEAD(&client->ports_list_head);
 238
 239	/* find free slot in the client table */
 240	spin_lock_irqsave(&clients_lock, flags);
 241	if (client_index < 0) {
 242		for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
 243		     c < SNDRV_SEQ_MAX_CLIENTS;
 244		     c++) {
 245			if (clienttab[c] || clienttablock[c])
 246				continue;
 247			clienttab[client->number = c] = client;
 248			spin_unlock_irqrestore(&clients_lock, flags);
 249			return client;
 250		}
 251	} else {
 252		if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
 253			clienttab[client->number = client_index] = client;
 254			spin_unlock_irqrestore(&clients_lock, flags);
 255			return client;
 256		}
 257	}
 258	spin_unlock_irqrestore(&clients_lock, flags);
 259	snd_seq_pool_delete(&client->pool);
 260	kfree(client);
 261	return NULL;	/* no free slot found or busy, return failure code */
 262}
 263
 264
 265static int seq_free_client1(struct snd_seq_client *client)
 266{
 267	unsigned long flags;
 268
 269	if (!client)
 270		return 0;
 271	snd_seq_delete_all_ports(client);
 272	snd_seq_queue_client_leave(client->number);
 273	spin_lock_irqsave(&clients_lock, flags);
 274	clienttablock[client->number] = 1;
 275	clienttab[client->number] = NULL;
 276	spin_unlock_irqrestore(&clients_lock, flags);
 277	snd_use_lock_sync(&client->use_lock);
 278	snd_seq_queue_client_termination(client->number);
 279	if (client->pool)
 280		snd_seq_pool_delete(&client->pool);
 281	spin_lock_irqsave(&clients_lock, flags);
 282	clienttablock[client->number] = 0;
 283	spin_unlock_irqrestore(&clients_lock, flags);
 284	return 0;
 285}
 286
 287
 288static void seq_free_client(struct snd_seq_client * client)
 289{
 290	mutex_lock(&register_mutex);
 291	switch (client->type) {
 292	case NO_CLIENT:
 293		snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
 294			   client->number);
 295		break;
 296	case USER_CLIENT:
 297	case KERNEL_CLIENT:
 298		seq_free_client1(client);
 299		usage_free(&client_usage, 1);
 300		break;
 301
 302	default:
 303		snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
 304			   client->number, client->type);
 305	}
 306	mutex_unlock(&register_mutex);
 307
 308	snd_seq_system_client_ev_client_exit(client->number);
 309}
 310
 311
 312
 313/* -------------------------------------------------------- */
 314
 315/* create a user client */
 316static int snd_seq_open(struct inode *inode, struct file *file)
 317{
 318	int c, mode;			/* client id */
 319	struct snd_seq_client *client;
 320	struct snd_seq_user_client *user;
 321	int err;
 322
 323	err = nonseekable_open(inode, file);
 324	if (err < 0)
 325		return err;
 326
 327	if (mutex_lock_interruptible(&register_mutex))
 328		return -ERESTARTSYS;
 329	client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
 330	if (client == NULL) {
 331		mutex_unlock(&register_mutex);
 332		return -ENOMEM;	/* failure code */
 333	}
 334
 335	mode = snd_seq_file_flags(file);
 336	if (mode & SNDRV_SEQ_LFLG_INPUT)
 337		client->accept_input = 1;
 338	if (mode & SNDRV_SEQ_LFLG_OUTPUT)
 339		client->accept_output = 1;
 340
 341	user = &client->data.user;
 342	user->fifo = NULL;
 343	user->fifo_pool_size = 0;
 344
 345	if (mode & SNDRV_SEQ_LFLG_INPUT) {
 346		user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
 347		user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
 348		if (user->fifo == NULL) {
 349			seq_free_client1(client);
 350			kfree(client);
 351			mutex_unlock(&register_mutex);
 352			return -ENOMEM;
 353		}
 354	}
 355
 356	usage_alloc(&client_usage, 1);
 357	client->type = USER_CLIENT;
 358	mutex_unlock(&register_mutex);
 359
 360	c = client->number;
 361	file->private_data = client;
 362
 363	/* fill client data */
 364	user->file = file;
 365	sprintf(client->name, "Client-%d", c);
 
 366
 367	/* make others aware this new client */
 368	snd_seq_system_client_ev_client_start(c);
 369
 370	return 0;
 371}
 372
 373/* delete a user client */
 374static int snd_seq_release(struct inode *inode, struct file *file)
 375{
 376	struct snd_seq_client *client = file->private_data;
 377
 378	if (client) {
 379		seq_free_client(client);
 380		if (client->data.user.fifo)
 381			snd_seq_fifo_delete(&client->data.user.fifo);
 
 382		kfree(client);
 383	}
 384
 385	return 0;
 386}
 387
 388
 389/* handle client read() */
 390/* possible error values:
 391 *	-ENXIO	invalid client or file open mode
 392 *	-ENOSPC	FIFO overflow (the flag is cleared after this error report)
 393 *	-EINVAL	no enough user-space buffer to write the whole event
 394 *	-EFAULT	seg. fault during copy to user space
 395 */
 396static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
 397			    loff_t *offset)
 398{
 399	struct snd_seq_client *client = file->private_data;
 400	struct snd_seq_fifo *fifo;
 401	int err;
 402	long result = 0;
 403	struct snd_seq_event_cell *cell;
 404
 405	if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
 406		return -ENXIO;
 407
 408	if (!access_ok(VERIFY_WRITE, buf, count))
 409		return -EFAULT;
 410
 411	/* check client structures are in place */
 412	if (snd_BUG_ON(!client))
 413		return -ENXIO;
 414
 415	if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
 416		return -ENXIO;
 417
 418	if (atomic_read(&fifo->overflow) > 0) {
 419		/* buffer overflow is detected */
 420		snd_seq_fifo_clear(fifo);
 421		/* return error code */
 422		return -ENOSPC;
 423	}
 424
 425	cell = NULL;
 426	err = 0;
 427	snd_seq_fifo_lock(fifo);
 428
 429	/* while data available in queue */
 430	while (count >= sizeof(struct snd_seq_event)) {
 431		int nonblock;
 432
 433		nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
 434		if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
 435			break;
 436		}
 437		if (snd_seq_ev_is_variable(&cell->event)) {
 438			struct snd_seq_event tmpev;
 439			tmpev = cell->event;
 440			tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
 441			if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
 442				err = -EFAULT;
 443				break;
 444			}
 445			count -= sizeof(struct snd_seq_event);
 446			buf += sizeof(struct snd_seq_event);
 447			err = snd_seq_expand_var_event(&cell->event, count,
 448						       (char __force *)buf, 0,
 449						       sizeof(struct snd_seq_event));
 450			if (err < 0)
 451				break;
 452			result += err;
 453			count -= err;
 454			buf += err;
 455		} else {
 456			if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
 457				err = -EFAULT;
 458				break;
 459			}
 460			count -= sizeof(struct snd_seq_event);
 461			buf += sizeof(struct snd_seq_event);
 462		}
 463		snd_seq_cell_free(cell);
 464		cell = NULL; /* to be sure */
 465		result += sizeof(struct snd_seq_event);
 466	}
 467
 468	if (err < 0) {
 469		if (cell)
 470			snd_seq_fifo_cell_putback(fifo, cell);
 471		if (err == -EAGAIN && result > 0)
 472			err = 0;
 473	}
 474	snd_seq_fifo_unlock(fifo);
 475
 476	return (err < 0) ? err : result;
 477}
 478
 479
 480/*
 481 * check access permission to the port
 482 */
 483static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
 484{
 485	if ((port->capability & flags) != flags)
 486		return 0;
 487	return flags;
 488}
 489
 490/*
 491 * check if the destination client is available, and return the pointer
 492 * if filter is non-zero, client filter bitmap is tested.
 493 */
 494static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
 495						    int filter)
 496{
 497	struct snd_seq_client *dest;
 498
 499	dest = snd_seq_client_use_ptr(event->dest.client);
 500	if (dest == NULL)
 501		return NULL;
 502	if (! dest->accept_input)
 503		goto __not_avail;
 504	if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
 505	    ! test_bit(event->type, dest->event_filter))
 506		goto __not_avail;
 507	if (filter && !(dest->filter & filter))
 508		goto __not_avail;
 509
 510	return dest; /* ok - accessible */
 511__not_avail:
 512	snd_seq_client_unlock(dest);
 513	return NULL;
 514}
 515
 516
 517/*
 518 * Return the error event.
 519 *
 520 * If the receiver client is a user client, the original event is
 521 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
 522 * the original event is also variable length, the external data is
 523 * copied after the event record. 
 524 * If the receiver client is a kernel client, the original event is
 525 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
 526 * kmalloc.
 527 */
 528static int bounce_error_event(struct snd_seq_client *client,
 529			      struct snd_seq_event *event,
 530			      int err, int atomic, int hop)
 531{
 532	struct snd_seq_event bounce_ev;
 533	int result;
 534
 535	if (client == NULL ||
 536	    ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
 537	    ! client->accept_input)
 538		return 0; /* ignored */
 539
 540	/* set up quoted error */
 541	memset(&bounce_ev, 0, sizeof(bounce_ev));
 542	bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
 543	bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
 544	bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
 545	bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
 546	bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
 547	bounce_ev.dest.client = client->number;
 548	bounce_ev.dest.port = event->source.port;
 549	bounce_ev.data.quote.origin = event->dest;
 550	bounce_ev.data.quote.event = event;
 551	bounce_ev.data.quote.value = -err; /* use positive value */
 552	result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
 553	if (result < 0) {
 554		client->event_lost++;
 555		return result;
 556	}
 557
 558	return result;
 559}
 560
 561
 562/*
 563 * rewrite the time-stamp of the event record with the curren time
 564 * of the given queue.
 565 * return non-zero if updated.
 566 */
 567static int update_timestamp_of_queue(struct snd_seq_event *event,
 568				     int queue, int real_time)
 569{
 570	struct snd_seq_queue *q;
 571
 572	q = queueptr(queue);
 573	if (! q)
 574		return 0;
 575	event->queue = queue;
 576	event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
 577	if (real_time) {
 578		event->time.time = snd_seq_timer_get_cur_time(q->timer);
 579		event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
 580	} else {
 581		event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
 582		event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
 583	}
 584	queuefree(q);
 585	return 1;
 586}
 587
 588
 589/*
 590 * deliver an event to the specified destination.
 591 * if filter is non-zero, client filter bitmap is tested.
 592 *
 593 *  RETURN VALUE: 0 : if succeeded
 594 *		 <0 : error
 595 */
 596static int snd_seq_deliver_single_event(struct snd_seq_client *client,
 597					struct snd_seq_event *event,
 598					int filter, int atomic, int hop)
 599{
 600	struct snd_seq_client *dest = NULL;
 601	struct snd_seq_client_port *dest_port = NULL;
 602	int result = -ENOENT;
 603	int direct;
 604
 605	direct = snd_seq_ev_is_direct(event);
 606
 607	dest = get_event_dest_client(event, filter);
 608	if (dest == NULL)
 609		goto __skip;
 610	dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
 611	if (dest_port == NULL)
 612		goto __skip;
 613
 614	/* check permission */
 615	if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
 616		result = -EPERM;
 617		goto __skip;
 618	}
 619		
 620	if (dest_port->timestamping)
 621		update_timestamp_of_queue(event, dest_port->time_queue,
 622					  dest_port->time_real);
 623
 624	switch (dest->type) {
 625	case USER_CLIENT:
 626		if (dest->data.user.fifo)
 627			result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
 628		break;
 629
 630	case KERNEL_CLIENT:
 631		if (dest_port->event_input == NULL)
 632			break;
 633		result = dest_port->event_input(event, direct,
 634						dest_port->private_data,
 635						atomic, hop);
 636		break;
 637	default:
 638		break;
 639	}
 640
 641  __skip:
 642	if (dest_port)
 643		snd_seq_port_unlock(dest_port);
 644	if (dest)
 645		snd_seq_client_unlock(dest);
 646
 647	if (result < 0 && !direct) {
 648		result = bounce_error_event(client, event, result, atomic, hop);
 649	}
 650	return result;
 651}
 652
 653
 654/*
 655 * send the event to all subscribers:
 656 */
 657static int deliver_to_subscribers(struct snd_seq_client *client,
 658				  struct snd_seq_event *event,
 659				  int atomic, int hop)
 660{
 661	struct snd_seq_subscribers *subs;
 662	int err = 0, num_ev = 0;
 663	struct snd_seq_event event_saved;
 664	struct snd_seq_client_port *src_port;
 665	struct snd_seq_port_subs_info *grp;
 666
 667	src_port = snd_seq_port_use_ptr(client, event->source.port);
 668	if (src_port == NULL)
 669		return -EINVAL; /* invalid source port */
 670	/* save original event record */
 671	event_saved = *event;
 672	grp = &src_port->c_src;
 673	
 674	/* lock list */
 675	if (atomic)
 676		read_lock(&grp->list_lock);
 677	else
 678		down_read(&grp->list_mutex);
 679	list_for_each_entry(subs, &grp->list_head, src_list) {
 
 
 
 680		event->dest = subs->info.dest;
 681		if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
 682			/* convert time according to flag with subscription */
 683			update_timestamp_of_queue(event, subs->info.queue,
 684						  subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
 685		err = snd_seq_deliver_single_event(client, event,
 686						   0, atomic, hop);
 687		if (err < 0)
 688			break;
 
 
 
 
 689		num_ev++;
 690		/* restore original event record */
 691		*event = event_saved;
 692	}
 693	if (atomic)
 694		read_unlock(&grp->list_lock);
 695	else
 696		up_read(&grp->list_mutex);
 697	*event = event_saved; /* restore */
 698	snd_seq_port_unlock(src_port);
 699	return (err < 0) ? err : num_ev;
 700}
 701
 702
 703#ifdef SUPPORT_BROADCAST 
 704/*
 705 * broadcast to all ports:
 706 */
 707static int port_broadcast_event(struct snd_seq_client *client,
 708				struct snd_seq_event *event,
 709				int atomic, int hop)
 710{
 711	int num_ev = 0, err = 0;
 712	struct snd_seq_client *dest_client;
 713	struct snd_seq_client_port *port;
 714
 715	dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
 716	if (dest_client == NULL)
 717		return 0; /* no matching destination */
 718
 719	read_lock(&dest_client->ports_lock);
 720	list_for_each_entry(port, &dest_client->ports_list_head, list) {
 721		event->dest.port = port->addr.port;
 722		/* pass NULL as source client to avoid error bounce */
 723		err = snd_seq_deliver_single_event(NULL, event,
 724						   SNDRV_SEQ_FILTER_BROADCAST,
 725						   atomic, hop);
 726		if (err < 0)
 727			break;
 
 
 
 
 728		num_ev++;
 729	}
 730	read_unlock(&dest_client->ports_lock);
 731	snd_seq_client_unlock(dest_client);
 732	event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
 733	return (err < 0) ? err : num_ev;
 734}
 735
 736/*
 737 * send the event to all clients:
 738 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
 739 */
 740static int broadcast_event(struct snd_seq_client *client,
 741			   struct snd_seq_event *event, int atomic, int hop)
 742{
 743	int err = 0, num_ev = 0;
 744	int dest;
 745	struct snd_seq_addr addr;
 746
 747	addr = event->dest; /* save */
 748
 749	for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
 750		/* don't send to itself */
 751		if (dest == client->number)
 752			continue;
 753		event->dest.client = dest;
 754		event->dest.port = addr.port;
 755		if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
 756			err = port_broadcast_event(client, event, atomic, hop);
 757		else
 758			/* pass NULL as source client to avoid error bounce */
 759			err = snd_seq_deliver_single_event(NULL, event,
 760							   SNDRV_SEQ_FILTER_BROADCAST,
 761							   atomic, hop);
 762		if (err < 0)
 763			break;
 
 
 
 
 764		num_ev += err;
 765	}
 766	event->dest = addr; /* restore */
 767	return (err < 0) ? err : num_ev;
 768}
 769
 770
 771/* multicast - not supported yet */
 772static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
 773			   int atomic, int hop)
 774{
 775	snd_printd("seq: multicast not supported yet.\n");
 776	return 0; /* ignored */
 777}
 778#endif /* SUPPORT_BROADCAST */
 779
 780
 781/* deliver an event to the destination port(s).
 782 * if the event is to subscribers or broadcast, the event is dispatched
 783 * to multiple targets.
 784 *
 785 * RETURN VALUE: n > 0  : the number of delivered events.
 786 *               n == 0 : the event was not passed to any client.
 787 *               n < 0  : error - event was not processed.
 788 */
 789static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
 790				 int atomic, int hop)
 791{
 792	int result;
 793
 794	hop++;
 795	if (hop >= SNDRV_SEQ_MAX_HOPS) {
 796		snd_printd("too long delivery path (%d:%d->%d:%d)\n",
 797			   event->source.client, event->source.port,
 798			   event->dest.client, event->dest.port);
 799		return -EMLINK;
 800	}
 801
 802	if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
 803	    event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
 804		result = deliver_to_subscribers(client, event, atomic, hop);
 805#ifdef SUPPORT_BROADCAST
 806	else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
 807		 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
 808		result = broadcast_event(client, event, atomic, hop);
 809	else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
 810		result = multicast_event(client, event, atomic, hop);
 811	else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
 812		result = port_broadcast_event(client, event, atomic, hop);
 813#endif
 814	else
 815		result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
 816
 817	return result;
 818}
 819
 820/*
 821 * dispatch an event cell:
 822 * This function is called only from queue check routines in timer
 823 * interrupts or after enqueued.
 824 * The event cell shall be released or re-queued in this function.
 825 *
 826 * RETURN VALUE: n > 0  : the number of delivered events.
 827 *		 n == 0 : the event was not passed to any client.
 828 *		 n < 0  : error - event was not processed.
 829 */
 830int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
 831{
 832	struct snd_seq_client *client;
 833	int result;
 834
 835	if (snd_BUG_ON(!cell))
 836		return -EINVAL;
 837
 838	client = snd_seq_client_use_ptr(cell->event.source.client);
 839	if (client == NULL) {
 840		snd_seq_cell_free(cell); /* release this cell */
 841		return -EINVAL;
 842	}
 843
 844	if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
 845		/* NOTE event:
 846		 * the event cell is re-used as a NOTE-OFF event and
 847		 * enqueued again.
 848		 */
 849		struct snd_seq_event tmpev, *ev;
 850
 851		/* reserve this event to enqueue note-off later */
 852		tmpev = cell->event;
 853		tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
 854		result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
 855
 856		/*
 857		 * This was originally a note event.  We now re-use the
 858		 * cell for the note-off event.
 859		 */
 860
 861		ev = &cell->event;
 862		ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
 863		ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
 864
 865		/* add the duration time */
 866		switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
 867		case SNDRV_SEQ_TIME_STAMP_TICK:
 868			ev->time.tick += ev->data.note.duration;
 869			break;
 870		case SNDRV_SEQ_TIME_STAMP_REAL:
 871			/* unit for duration is ms */
 872			ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
 873			ev->time.time.tv_sec += ev->data.note.duration / 1000 +
 874						ev->time.time.tv_nsec / 1000000000;
 875			ev->time.time.tv_nsec %= 1000000000;
 876			break;
 877		}
 878		ev->data.note.velocity = ev->data.note.off_velocity;
 879
 880		/* Now queue this cell as the note off event */
 881		if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
 882			snd_seq_cell_free(cell); /* release this cell */
 883
 884	} else {
 885		/* Normal events:
 886		 * event cell is freed after processing the event
 887		 */
 888
 889		result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
 890		snd_seq_cell_free(cell);
 891	}
 892
 893	snd_seq_client_unlock(client);
 894	return result;
 895}
 896
 897
 898/* Allocate a cell from client pool and enqueue it to queue:
 899 * if pool is empty and blocking is TRUE, sleep until a new cell is
 900 * available.
 901 */
 902static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
 903					struct snd_seq_event *event,
 904					struct file *file, int blocking,
 905					int atomic, int hop)
 906{
 907	struct snd_seq_event_cell *cell;
 908	int err;
 909
 910	/* special queue values - force direct passing */
 911	if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
 912		event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
 913		event->queue = SNDRV_SEQ_QUEUE_DIRECT;
 914	} else
 915#ifdef SUPPORT_BROADCAST
 916		if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
 917			event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
 918			event->queue = SNDRV_SEQ_QUEUE_DIRECT;
 919		}
 920#endif
 921	if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
 922		/* check presence of source port */
 923		struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
 924		if (src_port == NULL)
 925			return -EINVAL;
 926		snd_seq_port_unlock(src_port);
 927	}
 928
 929	/* direct event processing without enqueued */
 930	if (snd_seq_ev_is_direct(event)) {
 931		if (event->type == SNDRV_SEQ_EVENT_NOTE)
 932			return -EINVAL; /* this event must be enqueued! */
 933		return snd_seq_deliver_event(client, event, atomic, hop);
 934	}
 935
 936	/* Not direct, normal queuing */
 937	if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
 938		return -EINVAL;  /* invalid queue */
 939	if (! snd_seq_write_pool_allocated(client))
 940		return -ENXIO; /* queue is not allocated */
 941
 942	/* allocate an event cell */
 943	err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
 944	if (err < 0)
 945		return err;
 946
 947	/* we got a cell. enqueue it. */
 948	if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
 949		snd_seq_cell_free(cell);
 950		return err;
 951	}
 952
 953	return 0;
 954}
 955
 956
 957/*
 958 * check validity of event type and data length.
 959 * return non-zero if invalid.
 960 */
 961static int check_event_type_and_length(struct snd_seq_event *ev)
 962{
 963	switch (snd_seq_ev_length_type(ev)) {
 964	case SNDRV_SEQ_EVENT_LENGTH_FIXED:
 965		if (snd_seq_ev_is_variable_type(ev))
 966			return -EINVAL;
 967		break;
 968	case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
 969		if (! snd_seq_ev_is_variable_type(ev) ||
 970		    (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
 971			return -EINVAL;
 972		break;
 973	case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
 974		if (! snd_seq_ev_is_direct(ev))
 975			return -EINVAL;
 976		break;
 977	}
 978	return 0;
 979}
 980
 981
 982/* handle write() */
 983/* possible error values:
 984 *	-ENXIO	invalid client or file open mode
 985 *	-ENOMEM	malloc failed
 986 *	-EFAULT	seg. fault during copy from user space
 987 *	-EINVAL	invalid event
 988 *	-EAGAIN	no space in output pool
 989 *	-EINTR	interrupts while sleep
 990 *	-EMLINK	too many hops
 991 *	others	depends on return value from driver callback
 992 */
 993static ssize_t snd_seq_write(struct file *file, const char __user *buf,
 994			     size_t count, loff_t *offset)
 995{
 996	struct snd_seq_client *client = file->private_data;
 997	int written = 0, len;
 998	int err = -EINVAL;
 999	struct snd_seq_event event;
1000
1001	if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1002		return -ENXIO;
1003
1004	/* check client structures are in place */
1005	if (snd_BUG_ON(!client))
1006		return -ENXIO;
1007		
1008	if (!client->accept_output || client->pool == NULL)
1009		return -ENXIO;
1010
1011	/* allocate the pool now if the pool is not allocated yet */ 
1012	if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1013		if (snd_seq_pool_init(client->pool) < 0)
1014			return -ENOMEM;
1015	}
1016
1017	/* only process whole events */
1018	while (count >= sizeof(struct snd_seq_event)) {
1019		/* Read in the event header from the user */
1020		len = sizeof(event);
1021		if (copy_from_user(&event, buf, len)) {
1022			err = -EFAULT;
1023			break;
1024		}
1025		event.source.client = client->number;	/* fill in client number */
1026		/* Check for extension data length */
1027		if (check_event_type_and_length(&event)) {
1028			err = -EINVAL;
1029			break;
1030		}
1031
1032		/* check for special events */
1033		if (event.type == SNDRV_SEQ_EVENT_NONE)
1034			goto __skip_event;
1035		else if (snd_seq_ev_is_reserved(&event)) {
1036			err = -EINVAL;
1037			break;
1038		}
1039
1040		if (snd_seq_ev_is_variable(&event)) {
1041			int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1042			if ((size_t)(extlen + len) > count) {
1043				/* back out, will get an error this time or next */
1044				err = -EINVAL;
1045				break;
1046			}
1047			/* set user space pointer */
1048			event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1049			event.data.ext.ptr = (char __force *)buf
1050						+ sizeof(struct snd_seq_event);
1051			len += extlen; /* increment data length */
1052		} else {
1053#ifdef CONFIG_COMPAT
1054			if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1055				void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1056				event.data.ext.ptr = ptr;
1057			}
1058#endif
1059		}
1060
1061		/* ok, enqueue it */
1062		err = snd_seq_client_enqueue_event(client, &event, file,
1063						   !(file->f_flags & O_NONBLOCK),
1064						   0, 0);
1065		if (err < 0)
1066			break;
1067
1068	__skip_event:
1069		/* Update pointers and counts */
1070		count -= len;
1071		buf += len;
1072		written += len;
1073	}
1074
1075	return written ? written : err;
1076}
1077
1078
1079/*
1080 * handle polling
1081 */
1082static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1083{
1084	struct snd_seq_client *client = file->private_data;
1085	unsigned int mask = 0;
1086
1087	/* check client structures are in place */
1088	if (snd_BUG_ON(!client))
1089		return -ENXIO;
1090
1091	if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1092	    client->data.user.fifo) {
1093
1094		/* check if data is available in the outqueue */
1095		if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1096			mask |= POLLIN | POLLRDNORM;
1097	}
1098
1099	if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1100
1101		/* check if data is available in the pool */
1102		if (!snd_seq_write_pool_allocated(client) ||
1103		    snd_seq_pool_poll_wait(client->pool, file, wait))
1104			mask |= POLLOUT | POLLWRNORM;
1105	}
1106
1107	return mask;
1108}
1109
1110
1111/*-----------------------------------------------------*/
1112
1113
1114/* SYSTEM_INFO ioctl() */
1115static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1116{
1117	struct snd_seq_system_info info;
1118
1119	memset(&info, 0, sizeof(info));
1120	/* fill the info fields */
1121	info.queues = SNDRV_SEQ_MAX_QUEUES;
1122	info.clients = SNDRV_SEQ_MAX_CLIENTS;
1123	info.ports = 256;	/* fixed limit */
1124	info.channels = 256;	/* fixed limit */
1125	info.cur_clients = client_usage.cur;
1126	info.cur_queues = snd_seq_queue_get_cur_queues();
1127
1128	if (copy_to_user(arg, &info, sizeof(info)))
1129		return -EFAULT;
1130	return 0;
1131}
1132
1133
1134/* RUNNING_MODE ioctl() */
1135static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1136{
1137	struct snd_seq_running_info info;
1138	struct snd_seq_client *cptr;
1139	int err = 0;
1140
1141	if (copy_from_user(&info, arg, sizeof(info)))
1142		return -EFAULT;
1143
1144	/* requested client number */
1145	cptr = snd_seq_client_use_ptr(info.client);
1146	if (cptr == NULL)
1147		return -ENOENT;		/* don't change !!! */
1148
1149#ifdef SNDRV_BIG_ENDIAN
1150	if (! info.big_endian) {
1151		err = -EINVAL;
1152		goto __err;
1153	}
1154#else
1155	if (info.big_endian) {
1156		err = -EINVAL;
1157		goto __err;
1158	}
1159
1160#endif
1161	if (info.cpu_mode > sizeof(long)) {
1162		err = -EINVAL;
1163		goto __err;
1164	}
1165	cptr->convert32 = (info.cpu_mode < sizeof(long));
1166 __err:
1167	snd_seq_client_unlock(cptr);
1168	return err;
1169}
1170
1171/* CLIENT_INFO ioctl() */
1172static void get_client_info(struct snd_seq_client *cptr,
1173			    struct snd_seq_client_info *info)
1174{
1175	info->client = cptr->number;
1176
1177	/* fill the info fields */
1178	info->type = cptr->type;
1179	strcpy(info->name, cptr->name);
1180	info->filter = cptr->filter;
1181	info->event_lost = cptr->event_lost;
1182	memcpy(info->event_filter, cptr->event_filter, 32);
1183	info->num_ports = cptr->num_ports;
 
 
 
 
 
 
 
 
 
 
 
1184	memset(info->reserved, 0, sizeof(info->reserved));
1185}
1186
1187static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1188					 void __user *arg)
1189{
1190	struct snd_seq_client *cptr;
1191	struct snd_seq_client_info client_info;
1192
1193	if (copy_from_user(&client_info, arg, sizeof(client_info)))
1194		return -EFAULT;
1195
1196	/* requested client number */
1197	cptr = snd_seq_client_use_ptr(client_info.client);
1198	if (cptr == NULL)
1199		return -ENOENT;		/* don't change !!! */
1200
1201	get_client_info(cptr, &client_info);
1202	snd_seq_client_unlock(cptr);
1203
1204	if (copy_to_user(arg, &client_info, sizeof(client_info)))
1205		return -EFAULT;
1206	return 0;
1207}
1208
1209
1210/* CLIENT_INFO ioctl() */
1211static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1212					 void __user *arg)
1213{
1214	struct snd_seq_client_info client_info;
1215
1216	if (copy_from_user(&client_info, arg, sizeof(client_info)))
1217		return -EFAULT;
1218
1219	/* it is not allowed to set the info fields for an another client */
1220	if (client->number != client_info.client)
1221		return -EPERM;
1222	/* also client type must be set now */
1223	if (client->type != client_info.type)
1224		return -EINVAL;
1225
1226	/* fill the info fields */
1227	if (client_info.name[0])
1228		strlcpy(client->name, client_info.name, sizeof(client->name));
1229
1230	client->filter = client_info.filter;
1231	client->event_lost = client_info.event_lost;
1232	memcpy(client->event_filter, client_info.event_filter, 32);
1233
1234	return 0;
1235}
1236
1237
1238/* 
1239 * CREATE PORT ioctl() 
1240 */
1241static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1242				     void __user *arg)
1243{
1244	struct snd_seq_client_port *port;
1245	struct snd_seq_port_info info;
1246	struct snd_seq_port_callback *callback;
1247
1248	if (copy_from_user(&info, arg, sizeof(info)))
1249		return -EFAULT;
1250
1251	/* it is not allowed to create the port for an another client */
1252	if (info.addr.client != client->number)
1253		return -EPERM;
1254
1255	port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1256	if (port == NULL)
1257		return -ENOMEM;
1258
1259	if (client->type == USER_CLIENT && info.kernel) {
1260		snd_seq_delete_port(client, port->addr.port);
1261		return -EINVAL;
1262	}
1263	if (client->type == KERNEL_CLIENT) {
1264		if ((callback = info.kernel) != NULL) {
1265			if (callback->owner)
1266				port->owner = callback->owner;
1267			port->private_data = callback->private_data;
1268			port->private_free = callback->private_free;
1269			port->callback_all = callback->callback_all;
1270			port->event_input = callback->event_input;
1271			port->c_src.open = callback->subscribe;
1272			port->c_src.close = callback->unsubscribe;
1273			port->c_dest.open = callback->use;
1274			port->c_dest.close = callback->unuse;
1275		}
1276	}
1277
1278	info.addr = port->addr;
1279
1280	snd_seq_set_port_info(port, &info);
1281	snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1282
1283	if (copy_to_user(arg, &info, sizeof(info)))
1284		return -EFAULT;
1285
1286	return 0;
1287}
1288
1289/* 
1290 * DELETE PORT ioctl() 
1291 */
1292static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1293				     void __user *arg)
1294{
1295	struct snd_seq_port_info info;
1296	int err;
1297
1298	/* set passed parameters */
1299	if (copy_from_user(&info, arg, sizeof(info)))
1300		return -EFAULT;
1301	
1302	/* it is not allowed to remove the port for an another client */
1303	if (info.addr.client != client->number)
1304		return -EPERM;
1305
1306	err = snd_seq_delete_port(client, info.addr.port);
1307	if (err >= 0)
1308		snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1309	return err;
1310}
1311
1312
1313/* 
1314 * GET_PORT_INFO ioctl() (on any client) 
1315 */
1316static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1317				       void __user *arg)
1318{
1319	struct snd_seq_client *cptr;
1320	struct snd_seq_client_port *port;
1321	struct snd_seq_port_info info;
1322
1323	if (copy_from_user(&info, arg, sizeof(info)))
1324		return -EFAULT;
1325	cptr = snd_seq_client_use_ptr(info.addr.client);
1326	if (cptr == NULL)
1327		return -ENXIO;
1328
1329	port = snd_seq_port_use_ptr(cptr, info.addr.port);
1330	if (port == NULL) {
1331		snd_seq_client_unlock(cptr);
1332		return -ENOENT;			/* don't change */
1333	}
1334
1335	/* get port info */
1336	snd_seq_get_port_info(port, &info);
1337	snd_seq_port_unlock(port);
1338	snd_seq_client_unlock(cptr);
1339
1340	if (copy_to_user(arg, &info, sizeof(info)))
1341		return -EFAULT;
1342	return 0;
1343}
1344
1345
1346/* 
1347 * SET_PORT_INFO ioctl() (only ports on this/own client) 
1348 */
1349static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1350				       void __user *arg)
1351{
1352	struct snd_seq_client_port *port;
1353	struct snd_seq_port_info info;
1354
1355	if (copy_from_user(&info, arg, sizeof(info)))
1356		return -EFAULT;
1357
1358	if (info.addr.client != client->number) /* only set our own ports ! */
1359		return -EPERM;
1360	port = snd_seq_port_use_ptr(client, info.addr.port);
1361	if (port) {
1362		snd_seq_set_port_info(port, &info);
1363		snd_seq_port_unlock(port);
1364	}
1365	return 0;
1366}
1367
1368
1369/*
1370 * port subscription (connection)
1371 */
1372#define PERM_RD		(SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1373#define PERM_WR		(SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1374
1375static int check_subscription_permission(struct snd_seq_client *client,
1376					 struct snd_seq_client_port *sport,
1377					 struct snd_seq_client_port *dport,
1378					 struct snd_seq_port_subscribe *subs)
1379{
1380	if (client->number != subs->sender.client &&
1381	    client->number != subs->dest.client) {
1382		/* connection by third client - check export permission */
1383		if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1384			return -EPERM;
1385		if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1386			return -EPERM;
1387	}
1388
1389	/* check read permission */
1390	/* if sender or receiver is the subscribing client itself,
1391	 * no permission check is necessary
1392	 */
1393	if (client->number != subs->sender.client) {
1394		if (! check_port_perm(sport, PERM_RD))
1395			return -EPERM;
1396	}
1397	/* check write permission */
1398	if (client->number != subs->dest.client) {
1399		if (! check_port_perm(dport, PERM_WR))
1400			return -EPERM;
1401	}
1402	return 0;
1403}
1404
1405/*
1406 * send an subscription notify event to user client:
1407 * client must be user client.
1408 */
1409int snd_seq_client_notify_subscription(int client, int port,
1410				       struct snd_seq_port_subscribe *info,
1411				       int evtype)
1412{
1413	struct snd_seq_event event;
1414
1415	memset(&event, 0, sizeof(event));
1416	event.type = evtype;
1417	event.data.connect.dest = info->dest;
1418	event.data.connect.sender = info->sender;
1419
1420	return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1421}
1422
1423
1424/* 
1425 * add to port's subscription list IOCTL interface 
1426 */
1427static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1428					void __user *arg)
1429{
1430	int result = -EINVAL;
1431	struct snd_seq_client *receiver = NULL, *sender = NULL;
1432	struct snd_seq_client_port *sport = NULL, *dport = NULL;
1433	struct snd_seq_port_subscribe subs;
1434
1435	if (copy_from_user(&subs, arg, sizeof(subs)))
1436		return -EFAULT;
1437
1438	if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1439		goto __end;
1440	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1441		goto __end;
1442	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1443		goto __end;
1444	if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1445		goto __end;
1446
1447	result = check_subscription_permission(client, sport, dport, &subs);
1448	if (result < 0)
1449		goto __end;
1450
1451	/* connect them */
1452	result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1453	if (! result) /* broadcast announce */
1454		snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1455						   &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1456      __end:
1457      	if (sport)
1458		snd_seq_port_unlock(sport);
1459	if (dport)
1460		snd_seq_port_unlock(dport);
1461	if (sender)
1462		snd_seq_client_unlock(sender);
1463	if (receiver)
1464		snd_seq_client_unlock(receiver);
1465	return result;
1466}
1467
1468
1469/* 
1470 * remove from port's subscription list 
1471 */
1472static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1473					  void __user *arg)
1474{
1475	int result = -ENXIO;
1476	struct snd_seq_client *receiver = NULL, *sender = NULL;
1477	struct snd_seq_client_port *sport = NULL, *dport = NULL;
1478	struct snd_seq_port_subscribe subs;
1479
1480	if (copy_from_user(&subs, arg, sizeof(subs)))
1481		return -EFAULT;
1482
1483	if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1484		goto __end;
1485	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1486		goto __end;
1487	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1488		goto __end;
1489	if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1490		goto __end;
1491
1492	result = check_subscription_permission(client, sport, dport, &subs);
1493	if (result < 0)
1494		goto __end;
1495
1496	result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1497	if (! result) /* broadcast announce */
1498		snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1499						   &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1500      __end:
1501      	if (sport)
1502		snd_seq_port_unlock(sport);
1503	if (dport)
1504		snd_seq_port_unlock(dport);
1505	if (sender)
1506		snd_seq_client_unlock(sender);
1507	if (receiver)
1508		snd_seq_client_unlock(receiver);
1509	return result;
1510}
1511
1512
1513/* CREATE_QUEUE ioctl() */
1514static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1515				      void __user *arg)
1516{
1517	struct snd_seq_queue_info info;
1518	int result;
1519	struct snd_seq_queue *q;
1520
1521	if (copy_from_user(&info, arg, sizeof(info)))
1522		return -EFAULT;
1523
1524	result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1525	if (result < 0)
1526		return result;
1527
1528	q = queueptr(result);
1529	if (q == NULL)
1530		return -EINVAL;
1531
1532	info.queue = q->queue;
1533	info.locked = q->locked;
1534	info.owner = q->owner;
1535
1536	/* set queue name */
1537	if (! info.name[0])
1538		snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1539	strlcpy(q->name, info.name, sizeof(q->name));
1540	queuefree(q);
1541
1542	if (copy_to_user(arg, &info, sizeof(info)))
1543		return -EFAULT;
1544
1545	return 0;
1546}
1547
1548/* DELETE_QUEUE ioctl() */
1549static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1550				      void __user *arg)
1551{
1552	struct snd_seq_queue_info info;
1553
1554	if (copy_from_user(&info, arg, sizeof(info)))
1555		return -EFAULT;
1556
1557	return snd_seq_queue_delete(client->number, info.queue);
1558}
1559
1560/* GET_QUEUE_INFO ioctl() */
1561static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1562					void __user *arg)
1563{
1564	struct snd_seq_queue_info info;
1565	struct snd_seq_queue *q;
1566
1567	if (copy_from_user(&info, arg, sizeof(info)))
1568		return -EFAULT;
1569
1570	q = queueptr(info.queue);
1571	if (q == NULL)
1572		return -EINVAL;
1573
1574	memset(&info, 0, sizeof(info));
1575	info.queue = q->queue;
1576	info.owner = q->owner;
1577	info.locked = q->locked;
1578	strlcpy(info.name, q->name, sizeof(info.name));
1579	queuefree(q);
1580
1581	if (copy_to_user(arg, &info, sizeof(info)))
1582		return -EFAULT;
1583
1584	return 0;
1585}
1586
1587/* SET_QUEUE_INFO ioctl() */
1588static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1589					void __user *arg)
1590{
1591	struct snd_seq_queue_info info;
1592	struct snd_seq_queue *q;
1593
1594	if (copy_from_user(&info, arg, sizeof(info)))
1595		return -EFAULT;
1596
1597	if (info.owner != client->number)
1598		return -EINVAL;
1599
1600	/* change owner/locked permission */
1601	if (snd_seq_queue_check_access(info.queue, client->number)) {
1602		if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1603			return -EPERM;
1604		if (info.locked)
1605			snd_seq_queue_use(info.queue, client->number, 1);
1606	} else {
1607		return -EPERM;
1608	}	
1609
1610	q = queueptr(info.queue);
1611	if (! q)
1612		return -EINVAL;
1613	if (q->owner != client->number) {
1614		queuefree(q);
1615		return -EPERM;
1616	}
1617	strlcpy(q->name, info.name, sizeof(q->name));
1618	queuefree(q);
1619
1620	return 0;
1621}
1622
1623/* GET_NAMED_QUEUE ioctl() */
1624static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1625{
1626	struct snd_seq_queue_info info;
1627	struct snd_seq_queue *q;
1628
1629	if (copy_from_user(&info, arg, sizeof(info)))
1630		return -EFAULT;
1631
1632	q = snd_seq_queue_find_name(info.name);
1633	if (q == NULL)
1634		return -EINVAL;
1635	info.queue = q->queue;
1636	info.owner = q->owner;
1637	info.locked = q->locked;
1638	queuefree(q);
1639
1640	if (copy_to_user(arg, &info, sizeof(info)))
1641		return -EFAULT;
1642
1643	return 0;
1644}
1645
1646/* GET_QUEUE_STATUS ioctl() */
1647static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1648					  void __user *arg)
1649{
1650	struct snd_seq_queue_status status;
1651	struct snd_seq_queue *queue;
1652	struct snd_seq_timer *tmr;
1653
1654	if (copy_from_user(&status, arg, sizeof(status)))
1655		return -EFAULT;
1656
1657	queue = queueptr(status.queue);
1658	if (queue == NULL)
1659		return -EINVAL;
1660	memset(&status, 0, sizeof(status));
1661	status.queue = queue->queue;
1662	
1663	tmr = queue->timer;
1664	status.events = queue->tickq->cells + queue->timeq->cells;
1665
1666	status.time = snd_seq_timer_get_cur_time(tmr);
1667	status.tick = snd_seq_timer_get_cur_tick(tmr);
1668
1669	status.running = tmr->running;
1670
1671	status.flags = queue->flags;
1672	queuefree(queue);
1673
1674	if (copy_to_user(arg, &status, sizeof(status)))
1675		return -EFAULT;
1676	return 0;
1677}
1678
1679
1680/* GET_QUEUE_TEMPO ioctl() */
1681static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1682					 void __user *arg)
1683{
1684	struct snd_seq_queue_tempo tempo;
1685	struct snd_seq_queue *queue;
1686	struct snd_seq_timer *tmr;
1687
1688	if (copy_from_user(&tempo, arg, sizeof(tempo)))
1689		return -EFAULT;
1690
1691	queue = queueptr(tempo.queue);
1692	if (queue == NULL)
1693		return -EINVAL;
1694	memset(&tempo, 0, sizeof(tempo));
1695	tempo.queue = queue->queue;
1696	
1697	tmr = queue->timer;
1698
1699	tempo.tempo = tmr->tempo;
1700	tempo.ppq = tmr->ppq;
1701	tempo.skew_value = tmr->skew;
1702	tempo.skew_base = tmr->skew_base;
1703	queuefree(queue);
1704
1705	if (copy_to_user(arg, &tempo, sizeof(tempo)))
1706		return -EFAULT;
1707	return 0;
1708}
1709
1710
1711/* SET_QUEUE_TEMPO ioctl() */
1712int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1713{
1714	if (!snd_seq_queue_check_access(tempo->queue, client))
1715		return -EPERM;
1716	return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1717}
1718
1719EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1720
1721static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1722					 void __user *arg)
1723{
1724	int result;
1725	struct snd_seq_queue_tempo tempo;
1726
1727	if (copy_from_user(&tempo, arg, sizeof(tempo)))
1728		return -EFAULT;
1729
1730	result = snd_seq_set_queue_tempo(client->number, &tempo);
1731	return result < 0 ? result : 0;
1732}
1733
1734
1735/* GET_QUEUE_TIMER ioctl() */
1736static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1737					 void __user *arg)
1738{
1739	struct snd_seq_queue_timer timer;
1740	struct snd_seq_queue *queue;
1741	struct snd_seq_timer *tmr;
1742
1743	if (copy_from_user(&timer, arg, sizeof(timer)))
1744		return -EFAULT;
1745
1746	queue = queueptr(timer.queue);
1747	if (queue == NULL)
1748		return -EINVAL;
1749
1750	if (mutex_lock_interruptible(&queue->timer_mutex)) {
1751		queuefree(queue);
1752		return -ERESTARTSYS;
1753	}
1754	tmr = queue->timer;
1755	memset(&timer, 0, sizeof(timer));
1756	timer.queue = queue->queue;
1757
1758	timer.type = tmr->type;
1759	if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1760		timer.u.alsa.id = tmr->alsa_id;
1761		timer.u.alsa.resolution = tmr->preferred_resolution;
1762	}
1763	mutex_unlock(&queue->timer_mutex);
1764	queuefree(queue);
1765	
1766	if (copy_to_user(arg, &timer, sizeof(timer)))
1767		return -EFAULT;
1768	return 0;
1769}
1770
1771
1772/* SET_QUEUE_TIMER ioctl() */
1773static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1774					 void __user *arg)
1775{
1776	int result = 0;
1777	struct snd_seq_queue_timer timer;
1778
1779	if (copy_from_user(&timer, arg, sizeof(timer)))
1780		return -EFAULT;
1781
1782	if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1783		return -EINVAL;
1784
1785	if (snd_seq_queue_check_access(timer.queue, client->number)) {
1786		struct snd_seq_queue *q;
1787		struct snd_seq_timer *tmr;
1788
1789		q = queueptr(timer.queue);
1790		if (q == NULL)
1791			return -ENXIO;
1792		if (mutex_lock_interruptible(&q->timer_mutex)) {
1793			queuefree(q);
1794			return -ERESTARTSYS;
1795		}
1796		tmr = q->timer;
1797		snd_seq_queue_timer_close(timer.queue);
1798		tmr->type = timer.type;
1799		if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1800			tmr->alsa_id = timer.u.alsa.id;
1801			tmr->preferred_resolution = timer.u.alsa.resolution;
1802		}
1803		result = snd_seq_queue_timer_open(timer.queue);
1804		mutex_unlock(&q->timer_mutex);
1805		queuefree(q);
1806	} else {
1807		return -EPERM;
1808	}	
1809
1810	return result;
1811}
1812
1813
1814/* GET_QUEUE_CLIENT ioctl() */
1815static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1816					  void __user *arg)
1817{
1818	struct snd_seq_queue_client info;
1819	int used;
1820
1821	if (copy_from_user(&info, arg, sizeof(info)))
1822		return -EFAULT;
1823
1824	used = snd_seq_queue_is_used(info.queue, client->number);
1825	if (used < 0)
1826		return -EINVAL;
1827	info.used = used;
1828	info.client = client->number;
1829
1830	if (copy_to_user(arg, &info, sizeof(info)))
1831		return -EFAULT;
1832	return 0;
1833}
1834
1835
1836/* SET_QUEUE_CLIENT ioctl() */
1837static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1838					  void __user *arg)
1839{
1840	int err;
1841	struct snd_seq_queue_client info;
1842
1843	if (copy_from_user(&info, arg, sizeof(info)))
1844		return -EFAULT;
1845
1846	if (info.used >= 0) {
1847		err = snd_seq_queue_use(info.queue, client->number, info.used);
1848		if (err < 0)
1849			return err;
1850	}
1851
1852	return snd_seq_ioctl_get_queue_client(client, arg);
1853}
1854
1855
1856/* GET_CLIENT_POOL ioctl() */
1857static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1858					 void __user *arg)
1859{
1860	struct snd_seq_client_pool info;
1861	struct snd_seq_client *cptr;
1862
1863	if (copy_from_user(&info, arg, sizeof(info)))
1864		return -EFAULT;
1865
1866	cptr = snd_seq_client_use_ptr(info.client);
1867	if (cptr == NULL)
1868		return -ENOENT;
1869	memset(&info, 0, sizeof(info));
 
1870	info.output_pool = cptr->pool->size;
1871	info.output_room = cptr->pool->room;
1872	info.output_free = info.output_pool;
1873	info.output_free = snd_seq_unused_cells(cptr->pool);
1874	if (cptr->type == USER_CLIENT) {
1875		info.input_pool = cptr->data.user.fifo_pool_size;
1876		info.input_free = info.input_pool;
1877		if (cptr->data.user.fifo)
1878			info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1879	} else {
1880		info.input_pool = 0;
1881		info.input_free = 0;
1882	}
1883	snd_seq_client_unlock(cptr);
1884	
1885	if (copy_to_user(arg, &info, sizeof(info)))
1886		return -EFAULT;
1887	return 0;
1888}
1889
1890/* SET_CLIENT_POOL ioctl() */
1891static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1892					 void __user *arg)
1893{
1894	struct snd_seq_client_pool info;
1895	int rc;
1896
1897	if (copy_from_user(&info, arg, sizeof(info)))
1898		return -EFAULT;
1899
1900	if (client->number != info.client)
1901		return -EINVAL; /* can't change other clients */
1902
1903	if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1904	    (! snd_seq_write_pool_allocated(client) ||
1905	     info.output_pool != client->pool->size)) {
1906		if (snd_seq_write_pool_allocated(client)) {
1907			/* remove all existing cells */
1908			snd_seq_queue_client_leave_cells(client->number);
1909			snd_seq_pool_done(client->pool);
1910		}
1911		client->pool->size = info.output_pool;
1912		rc = snd_seq_pool_init(client->pool);
1913		if (rc < 0)
1914			return rc;
1915	}
1916	if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1917	    info.input_pool >= 1 &&
1918	    info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1919	    info.input_pool != client->data.user.fifo_pool_size) {
1920		/* change pool size */
1921		rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1922		if (rc < 0)
1923			return rc;
1924		client->data.user.fifo_pool_size = info.input_pool;
1925	}
1926	if (info.output_room >= 1 &&
1927	    info.output_room <= client->pool->size) {
1928		client->pool->room  = info.output_room;
1929	}
1930
1931	return snd_seq_ioctl_get_client_pool(client, arg);
1932}
1933
1934
1935/* REMOVE_EVENTS ioctl() */
1936static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1937				       void __user *arg)
1938{
1939	struct snd_seq_remove_events info;
1940
1941	if (copy_from_user(&info, arg, sizeof(info)))
1942		return -EFAULT;
1943
1944	/*
1945	 * Input mostly not implemented XXX.
1946	 */
1947	if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1948		/*
1949		 * No restrictions so for a user client we can clear
1950		 * the whole fifo
1951		 */
1952		if (client->type == USER_CLIENT)
1953			snd_seq_fifo_clear(client->data.user.fifo);
1954	}
1955
1956	if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1957		snd_seq_queue_remove_cells(client->number, &info);
1958
1959	return 0;
1960}
1961
1962
1963/*
1964 * get subscription info
1965 */
1966static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1967					  void __user *arg)
1968{
1969	int result;
1970	struct snd_seq_client *sender = NULL;
1971	struct snd_seq_client_port *sport = NULL;
1972	struct snd_seq_port_subscribe subs;
1973	struct snd_seq_subscribers *p;
1974
1975	if (copy_from_user(&subs, arg, sizeof(subs)))
1976		return -EFAULT;
1977
1978	result = -EINVAL;
1979	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1980		goto __end;
1981	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1982		goto __end;
1983	p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1984	if (p) {
1985		result = 0;
1986		subs = p->info;
1987	} else
1988		result = -ENOENT;
1989
1990      __end:
1991      	if (sport)
1992		snd_seq_port_unlock(sport);
1993	if (sender)
1994		snd_seq_client_unlock(sender);
1995	if (result >= 0) {
1996		if (copy_to_user(arg, &subs, sizeof(subs)))
1997			return -EFAULT;
1998	}
1999	return result;
2000}
2001
2002
2003/*
2004 * get subscription info - check only its presence
2005 */
2006static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2007				    void __user *arg)
2008{
2009	int result = -ENXIO;
2010	struct snd_seq_client *cptr = NULL;
2011	struct snd_seq_client_port *port = NULL;
2012	struct snd_seq_query_subs subs;
2013	struct snd_seq_port_subs_info *group;
2014	struct list_head *p;
2015	int i;
2016
2017	if (copy_from_user(&subs, arg, sizeof(subs)))
2018		return -EFAULT;
2019
2020	if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2021		goto __end;
2022	if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2023		goto __end;
2024
2025	switch (subs.type) {
2026	case SNDRV_SEQ_QUERY_SUBS_READ:
2027		group = &port->c_src;
2028		break;
2029	case SNDRV_SEQ_QUERY_SUBS_WRITE:
2030		group = &port->c_dest;
2031		break;
2032	default:
2033		goto __end;
2034	}
2035
2036	down_read(&group->list_mutex);
2037	/* search for the subscriber */
2038	subs.num_subs = group->count;
2039	i = 0;
2040	result = -ENOENT;
2041	list_for_each(p, &group->list_head) {
2042		if (i++ == subs.index) {
2043			/* found! */
2044			struct snd_seq_subscribers *s;
2045			if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2046				s = list_entry(p, struct snd_seq_subscribers, src_list);
2047				subs.addr = s->info.dest;
2048			} else {
2049				s = list_entry(p, struct snd_seq_subscribers, dest_list);
2050				subs.addr = s->info.sender;
2051			}
2052			subs.flags = s->info.flags;
2053			subs.queue = s->info.queue;
2054			result = 0;
2055			break;
2056		}
2057	}
2058	up_read(&group->list_mutex);
2059
2060      __end:
2061   	if (port)
2062		snd_seq_port_unlock(port);
2063	if (cptr)
2064		snd_seq_client_unlock(cptr);
2065	if (result >= 0) {
2066		if (copy_to_user(arg, &subs, sizeof(subs)))
2067			return -EFAULT;
2068	}
2069	return result;
2070}
2071
2072
2073/*
2074 * query next client
2075 */
2076static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2077					   void __user *arg)
2078{
2079	struct snd_seq_client *cptr = NULL;
2080	struct snd_seq_client_info info;
2081
2082	if (copy_from_user(&info, arg, sizeof(info)))
2083		return -EFAULT;
2084
2085	/* search for next client */
2086	info.client++;
2087	if (info.client < 0)
2088		info.client = 0;
2089	for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2090		cptr = snd_seq_client_use_ptr(info.client);
2091		if (cptr)
2092			break; /* found */
2093	}
2094	if (cptr == NULL)
2095		return -ENOENT;
2096
2097	get_client_info(cptr, &info);
2098	snd_seq_client_unlock(cptr);
2099
2100	if (copy_to_user(arg, &info, sizeof(info)))
2101		return -EFAULT;
2102	return 0;
2103}
2104
2105/* 
2106 * query next port
2107 */
2108static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2109					 void __user *arg)
2110{
2111	struct snd_seq_client *cptr;
2112	struct snd_seq_client_port *port = NULL;
2113	struct snd_seq_port_info info;
2114
2115	if (copy_from_user(&info, arg, sizeof(info)))
2116		return -EFAULT;
2117	cptr = snd_seq_client_use_ptr(info.addr.client);
2118	if (cptr == NULL)
2119		return -ENXIO;
2120
2121	/* search for next port */
2122	info.addr.port++;
2123	port = snd_seq_port_query_nearest(cptr, &info);
2124	if (port == NULL) {
2125		snd_seq_client_unlock(cptr);
2126		return -ENOENT;
2127	}
2128
2129	/* get port info */
2130	info.addr = port->addr;
2131	snd_seq_get_port_info(port, &info);
2132	snd_seq_port_unlock(port);
2133	snd_seq_client_unlock(cptr);
2134
2135	if (copy_to_user(arg, &info, sizeof(info)))
2136		return -EFAULT;
2137	return 0;
2138}
2139
2140/* -------------------------------------------------------- */
2141
2142static struct seq_ioctl_table {
2143	unsigned int cmd;
2144	int (*func)(struct snd_seq_client *client, void __user * arg);
2145} ioctl_tables[] = {
2146	{ SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2147	{ SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2148	{ SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2149	{ SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2150	{ SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2151	{ SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2152	{ SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2153	{ SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2154	{ SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2155	{ SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2156	{ SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2157	{ SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2158	{ SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2159	{ SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2160	{ SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2161	{ SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2162	{ SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2163	{ SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2164	{ SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2165	{ SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2166	{ SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2167	{ SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2168	{ SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2169	{ SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2170	{ SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2171	{ SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2172	{ SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2173	{ SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2174	{ SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2175	{ 0, NULL },
2176};
2177
2178static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2179			    void __user *arg)
2180{
2181	struct seq_ioctl_table *p;
2182
2183	switch (cmd) {
2184	case SNDRV_SEQ_IOCTL_PVERSION:
2185		/* return sequencer version number */
2186		return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2187	case SNDRV_SEQ_IOCTL_CLIENT_ID:
2188		/* return the id of this client */
2189		return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2190	}
2191
2192	if (! arg)
2193		return -EFAULT;
2194	for (p = ioctl_tables; p->cmd; p++) {
2195		if (p->cmd == cmd)
2196			return p->func(client, arg);
2197	}
2198	snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2199		   cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2200	return -ENOTTY;
2201}
2202
2203
2204static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2205{
2206	struct snd_seq_client *client = file->private_data;
2207
2208	if (snd_BUG_ON(!client))
2209		return -ENXIO;
2210		
2211	return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2212}
2213
2214#ifdef CONFIG_COMPAT
2215#include "seq_compat.c"
2216#else
2217#define snd_seq_ioctl_compat	NULL
2218#endif
2219
2220/* -------------------------------------------------------- */
2221
2222
2223/* exported to kernel modules */
2224int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2225				 const char *name_fmt, ...)
2226{
2227	struct snd_seq_client *client;
2228	va_list args;
2229
2230	if (snd_BUG_ON(in_interrupt()))
2231		return -EBUSY;
2232
2233	if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2234		return -EINVAL;
2235	if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2236		return -EINVAL;
2237
2238	if (mutex_lock_interruptible(&register_mutex))
2239		return -ERESTARTSYS;
2240
2241	if (card) {
2242		client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2243			+ card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2244		if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2245			client_index = -1;
2246	}
2247
2248	/* empty write queue as default */
2249	client = seq_create_client1(client_index, 0);
2250	if (client == NULL) {
2251		mutex_unlock(&register_mutex);
2252		return -EBUSY;	/* failure code */
2253	}
2254	usage_alloc(&client_usage, 1);
2255
2256	client->accept_input = 1;
2257	client->accept_output = 1;
 
2258		
2259	va_start(args, name_fmt);
2260	vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2261	va_end(args);
2262
2263	client->type = KERNEL_CLIENT;
2264	mutex_unlock(&register_mutex);
2265
2266	/* make others aware this new client */
2267	snd_seq_system_client_ev_client_start(client->number);
2268	
2269	/* return client number to caller */
2270	return client->number;
2271}
2272
2273EXPORT_SYMBOL(snd_seq_create_kernel_client);
2274
2275/* exported to kernel modules */
2276int snd_seq_delete_kernel_client(int client)
2277{
2278	struct snd_seq_client *ptr;
2279
2280	if (snd_BUG_ON(in_interrupt()))
2281		return -EBUSY;
2282
2283	ptr = clientptr(client);
2284	if (ptr == NULL)
2285		return -EINVAL;
2286
2287	seq_free_client(ptr);
2288	kfree(ptr);
2289	return 0;
2290}
2291
2292EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2293
2294/* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2295 * and snd_seq_kernel_client_enqueue_blocking
2296 */
2297static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2298				 struct file *file, int blocking,
2299				 int atomic, int hop)
2300{
2301	struct snd_seq_client *cptr;
2302	int result;
2303
2304	if (snd_BUG_ON(!ev))
2305		return -EINVAL;
2306
2307	if (ev->type == SNDRV_SEQ_EVENT_NONE)
2308		return 0; /* ignore this */
2309	if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2310		return -EINVAL; /* quoted events can't be enqueued */
2311
2312	/* fill in client number */
2313	ev->source.client = client;
2314
2315	if (check_event_type_and_length(ev))
2316		return -EINVAL;
2317
2318	cptr = snd_seq_client_use_ptr(client);
2319	if (cptr == NULL)
2320		return -EINVAL;
2321	
2322	if (! cptr->accept_output)
2323		result = -EPERM;
2324	else /* send it */
2325		result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2326
2327	snd_seq_client_unlock(cptr);
2328	return result;
2329}
2330
2331/*
2332 * exported, called by kernel clients to enqueue events (w/o blocking)
2333 *
2334 * RETURN VALUE: zero if succeed, negative if error
2335 */
2336int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2337				  int atomic, int hop)
2338{
2339	return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2340}
2341
2342EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2343
2344/*
2345 * exported, called by kernel clients to enqueue events (with blocking)
2346 *
2347 * RETURN VALUE: zero if succeed, negative if error
2348 */
2349int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2350					   struct file *file,
2351					   int atomic, int hop)
2352{
2353	return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2354}
2355
2356EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2357
2358/* 
2359 * exported, called by kernel clients to dispatch events directly to other
2360 * clients, bypassing the queues.  Event time-stamp will be updated.
2361 *
2362 * RETURN VALUE: negative = delivery failed,
2363 *		 zero, or positive: the number of delivered events
2364 */
2365int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2366				   int atomic, int hop)
2367{
2368	struct snd_seq_client *cptr;
2369	int result;
2370
2371	if (snd_BUG_ON(!ev))
2372		return -EINVAL;
2373
2374	/* fill in client number */
2375	ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2376	ev->source.client = client;
2377
2378	if (check_event_type_and_length(ev))
2379		return -EINVAL;
2380
2381	cptr = snd_seq_client_use_ptr(client);
2382	if (cptr == NULL)
2383		return -EINVAL;
2384
2385	if (!cptr->accept_output)
2386		result = -EPERM;
2387	else
2388		result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2389
2390	snd_seq_client_unlock(cptr);
2391	return result;
2392}
2393
2394EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2395
2396/*
2397 * exported, called by kernel clients to perform same functions as with
2398 * userland ioctl() 
2399 */
2400int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2401{
2402	struct snd_seq_client *client;
2403	mm_segment_t fs;
2404	int result;
2405
2406	client = clientptr(clientid);
2407	if (client == NULL)
2408		return -ENXIO;
2409	fs = snd_enter_user();
2410	result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2411	snd_leave_user(fs);
2412	return result;
2413}
2414
2415EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2416
2417/* exported (for OSS emulator) */
2418int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2419{
2420	struct snd_seq_client *client;
2421
2422	client = clientptr(clientid);
2423	if (client == NULL)
2424		return -ENXIO;
2425
2426	if (! snd_seq_write_pool_allocated(client))
2427		return 1;
2428	if (snd_seq_pool_poll_wait(client->pool, file, wait))
2429		return 1;
2430	return 0;
2431}
2432
2433EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2434
2435/*---------------------------------------------------------------------------*/
2436
2437#ifdef CONFIG_PROC_FS
2438/*
2439 *  /proc interface
2440 */
2441static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2442					  struct snd_seq_port_subs_info *group,
2443					  int is_src, char *msg)
2444{
2445	struct list_head *p;
2446	struct snd_seq_subscribers *s;
2447	int count = 0;
2448
2449	down_read(&group->list_mutex);
2450	if (list_empty(&group->list_head)) {
2451		up_read(&group->list_mutex);
2452		return;
2453	}
2454	snd_iprintf(buffer, msg);
2455	list_for_each(p, &group->list_head) {
2456		if (is_src)
2457			s = list_entry(p, struct snd_seq_subscribers, src_list);
2458		else
2459			s = list_entry(p, struct snd_seq_subscribers, dest_list);
2460		if (count++)
2461			snd_iprintf(buffer, ", ");
2462		snd_iprintf(buffer, "%d:%d",
2463			    is_src ? s->info.dest.client : s->info.sender.client,
2464			    is_src ? s->info.dest.port : s->info.sender.port);
2465		if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2466			snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2467		if (group->exclusive)
2468			snd_iprintf(buffer, "[ex]");
2469	}
2470	up_read(&group->list_mutex);
2471	snd_iprintf(buffer, "\n");
2472}
2473
2474#define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2475#define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2476#define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2477
2478#define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2479
2480static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2481				    struct snd_seq_client *client)
2482{
2483	struct snd_seq_client_port *p;
2484
2485	mutex_lock(&client->ports_mutex);
2486	list_for_each_entry(p, &client->ports_list_head, list) {
2487		snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2488			    p->addr.port, p->name,
2489			    FLAG_PERM_RD(p->capability),
2490			    FLAG_PERM_WR(p->capability),
2491			    FLAG_PERM_EX(p->capability),
2492			    FLAG_PERM_DUPLEX(p->capability));
2493		snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2494		snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2495	}
2496	mutex_unlock(&client->ports_mutex);
2497}
2498
2499
2500/* exported to seq_info.c */
2501void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2502			       struct snd_info_buffer *buffer)
2503{
2504	int c;
2505	struct snd_seq_client *client;
2506
2507	snd_iprintf(buffer, "Client info\n");
2508	snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2509	snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2510	snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2511	snd_iprintf(buffer, "\n");
2512
2513	/* list the client table */
2514	for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2515		client = snd_seq_client_use_ptr(c);
2516		if (client == NULL)
2517			continue;
2518		if (client->type == NO_CLIENT) {
2519			snd_seq_client_unlock(client);
2520			continue;
2521		}
2522
2523		snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2524			    c, client->name,
2525			    client->type == USER_CLIENT ? "User" : "Kernel");
2526		snd_seq_info_dump_ports(buffer, client);
2527		if (snd_seq_write_pool_allocated(client)) {
2528			snd_iprintf(buffer, "  Output pool :\n");
2529			snd_seq_info_pool(buffer, client->pool, "    ");
2530		}
2531		if (client->type == USER_CLIENT && client->data.user.fifo &&
2532		    client->data.user.fifo->pool) {
2533			snd_iprintf(buffer, "  Input pool :\n");
2534			snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2535		}
2536		snd_seq_client_unlock(client);
2537	}
2538}
2539#endif /* CONFIG_PROC_FS */
2540
2541/*---------------------------------------------------------------------------*/
2542
2543
2544/*
2545 *  REGISTRATION PART
2546 */
2547
2548static const struct file_operations snd_seq_f_ops =
2549{
2550	.owner =	THIS_MODULE,
2551	.read =		snd_seq_read,
2552	.write =	snd_seq_write,
2553	.open =		snd_seq_open,
2554	.release =	snd_seq_release,
2555	.llseek =	no_llseek,
2556	.poll =		snd_seq_poll,
2557	.unlocked_ioctl =	snd_seq_ioctl,
2558	.compat_ioctl =	snd_seq_ioctl_compat,
2559};
2560
 
 
2561/* 
2562 * register sequencer device 
2563 */
2564int __init snd_sequencer_device_init(void)
2565{
2566	int err;
2567
 
 
 
2568	if (mutex_lock_interruptible(&register_mutex))
2569		return -ERESTARTSYS;
2570
2571	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2572				       &snd_seq_f_ops, NULL, "seq")) < 0) {
 
2573		mutex_unlock(&register_mutex);
 
2574		return err;
2575	}
2576	
2577	mutex_unlock(&register_mutex);
2578
2579	return 0;
2580}
2581
2582
2583
2584/* 
2585 * unregister sequencer device 
2586 */
2587void __exit snd_sequencer_device_done(void)
2588{
2589	snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
 
2590}