Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2503 insertions, 0 deletions

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
new file mode 100644
index 000000000000..d8f76afd284b
--- /dev/null
+++ b/sound/core/seq/seq_clientmgr.c
@@ -0,0 +1,2503 @@
+/*
+ *  ALSA sequencer Client Manager
+ *  Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
+ *                             Jaroslav Kysela <perex@suse.cz>
+ *                             Takashi Iwai <tiwai@suse.de>
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/minors.h>
+#include <linux/kmod.h>
+
+#include <sound/seq_kernel.h>
+#include "seq_clientmgr.h"
+#include "seq_memory.h"
+#include "seq_queue.h"
+#include "seq_timer.h"
+#include "seq_info.h"
+#include "seq_system.h"
+#include <sound/seq_device.h>
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+#endif
+
+/* Client Manager
+
+ * this module handles the connections of userland and kernel clients
+ * 
+ */
+
+#define SNDRV_SEQ_LFLG_INPUT	0x0001
+#define SNDRV_SEQ_LFLG_OUTPUT	0x0002
+#define SNDRV_SEQ_LFLG_OPEN	(SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
+
+static DEFINE_SPINLOCK(clients_lock);
+static DECLARE_MUTEX(register_mutex);
+
+/*
+ * client table
+ */
+static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
+static client_t *clienttab[SNDRV_SEQ_MAX_CLIENTS];
+static usage_t client_usage;
+
+/*
+ * prototypes
+ */
+static int bounce_error_event(client_t *client, snd_seq_event_t *event, int err, int atomic, int hop);
+static int snd_seq_deliver_single_event(client_t *client, snd_seq_event_t *event, int filter, int atomic, int hop);
+
+/*
+ */
+ 
+static inline mm_segment_t snd_enter_user(void)
+{
+	mm_segment_t fs = get_fs();
+	set_fs(get_ds());
+	return fs;
+}
+
+static inline void snd_leave_user(mm_segment_t fs)
+{
+	set_fs(fs);
+}
+
+/*
+ */
+static inline unsigned short snd_seq_file_flags(struct file *file)
+{
+        switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
+        case FMODE_WRITE:
+                return SNDRV_SEQ_LFLG_OUTPUT;
+        case FMODE_READ:
+                return SNDRV_SEQ_LFLG_INPUT;
+        default:
+                return SNDRV_SEQ_LFLG_OPEN;
+        }
+}
+
+static inline int snd_seq_write_pool_allocated(client_t *client)
+{
+	return snd_seq_total_cells(client->pool) > 0;
+}
+
+/* return pointer to client structure for specified id */
+static client_t *clientptr(int clientid)
+{
+	if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
+		snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid);
+		return NULL;
+	}
+	return clienttab[clientid];
+}
+
+extern int seq_client_load[];
+
+client_t *snd_seq_client_use_ptr(int clientid)
+{
+	unsigned long flags;
+	client_t *client;
+
+	if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
+		snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid);
+		return NULL;
+	}
+	spin_lock_irqsave(&clients_lock, flags);
+	client = clientptr(clientid);
+	if (client)
+		goto __lock;
+	if (clienttablock[clientid]) {
+		spin_unlock_irqrestore(&clients_lock, flags);
+		return NULL;
+	}
+	spin_unlock_irqrestore(&clients_lock, flags);
+#ifdef CONFIG_KMOD
+	if (!in_interrupt() && current->fs->root) {
+		static char client_requested[64];
+		static char card_requested[SNDRV_CARDS];
+		if (clientid < 64) {
+			int idx;
+			
+			if (! client_requested[clientid] && current->fs->root) {
+				client_requested[clientid] = 1;
+				for (idx = 0; idx < 64; idx++) {
+					if (seq_client_load[idx] < 0)
+						break;
+					if (seq_client_load[idx] == clientid) {
+						request_module("snd-seq-client-%i", clientid);
+						break;
+					}
+				}
+			}
+		} else if (clientid >= 64 && clientid < 128) {
+			int card = (clientid - 64) / 8;
+			if (card < snd_ecards_limit) {
+				if (! card_requested[card]) {
+					card_requested[card] = 1;
+					snd_request_card(card);
+				}
+				snd_seq_device_load_drivers();
+			}
+		}
+		spin_lock_irqsave(&clients_lock, flags);
+		client = clientptr(clientid);
+		if (client)
+			goto __lock;
+		spin_unlock_irqrestore(&clients_lock, flags);
+	}
+#endif
+	return NULL;
+
+      __lock:
+	snd_use_lock_use(&client->use_lock);
+	spin_unlock_irqrestore(&clients_lock, flags);
+	return client;
+}
+
+static void usage_alloc(usage_t * res, int num)
+{
+	res->cur += num;
+	if (res->cur > res->peak)
+		res->peak = res->cur;
+}
+
+static void usage_free(usage_t * res, int num)
+{
+	res->cur -= num;
+}
+
+/* initialise data structures */
+int __init client_init_data(void)
+{
+	/* zap out the client table */
+	memset(&clienttablock, 0, sizeof(clienttablock));
+	memset(&clienttab, 0, sizeof(clienttab));
+	return 0;
+}
+
+
+static client_t *seq_create_client1(int client_index, int poolsize)
+{
+	unsigned long flags;
+	int c;
+	client_t *client;
+
+	/* init client data */
+	client = kcalloc(1, sizeof(*client), GFP_KERNEL);
+	if (client == NULL)
+		return NULL;
+	client->pool = snd_seq_pool_new(poolsize);
+	if (client->pool == NULL) {
+		kfree(client);
+		return NULL;
+	}
+	client->type = NO_CLIENT;
+	snd_use_lock_init(&client->use_lock);
+	rwlock_init(&client->ports_lock);
+	init_MUTEX(&client->ports_mutex);
+	INIT_LIST_HEAD(&client->ports_list_head);
+
+	/* find free slot in the client table */
+	spin_lock_irqsave(&clients_lock, flags);
+	if (client_index < 0) {
+		for (c = 128; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
+			if (clienttab[c] || clienttablock[c])
+				continue;
+			clienttab[client->number = c] = client;
+			spin_unlock_irqrestore(&clients_lock, flags);
+			return client;
+		}
+	} else {
+		if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
+			clienttab[client->number = client_index] = client;
+			spin_unlock_irqrestore(&clients_lock, flags);
+			return client;
+		}
+	}
+	spin_unlock_irqrestore(&clients_lock, flags);
+	snd_seq_pool_delete(&client->pool);
+	kfree(client);
+	return NULL;	/* no free slot found or busy, return failure code */
+}
+
+
+static int seq_free_client1(client_t *client)
+{
+	unsigned long flags;
+
+	snd_assert(client != NULL, return -EINVAL);
+	snd_seq_delete_all_ports(client);
+	snd_seq_queue_client_leave(client->number);
+	spin_lock_irqsave(&clients_lock, flags);
+	clienttablock[client->number] = 1;
+	clienttab[client->number] = NULL;
+	spin_unlock_irqrestore(&clients_lock, flags);
+	snd_use_lock_sync(&client->use_lock);
+	snd_seq_queue_client_termination(client->number);
+	if (client->pool)
+		snd_seq_pool_delete(&client->pool);
+	spin_lock_irqsave(&clients_lock, flags);
+	clienttablock[client->number] = 0;
+	spin_unlock_irqrestore(&clients_lock, flags);
+	return 0;
+}
+
+
+static void seq_free_client(client_t * client)
+{
+	down(&register_mutex);
+	switch (client->type) {
+	case NO_CLIENT:
+		snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n", client->number);
+		break;
+	case USER_CLIENT:
+	case KERNEL_CLIENT:
+		seq_free_client1(client);
+		usage_free(&client_usage, 1);
+		break;
+
+	default:
+		snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n", client->number, client->type);
+	}
+	up(&register_mutex);
+
+	snd_seq_system_client_ev_client_exit(client->number);
+}
+
+
+
+/* -------------------------------------------------------- */
+
+/* create a user client */
+static int snd_seq_open(struct inode *inode, struct file *file)
+{
+	int c, mode;			/* client id */
+	client_t *client;
+	user_client_t *user;
+
+	if (down_interruptible(&register_mutex))
+		return -ERESTARTSYS;
+	client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
+	if (client == NULL) {
+		up(&register_mutex);
+		return -ENOMEM;	/* failure code */
+	}
+
+	mode = snd_seq_file_flags(file);
+	if (mode & SNDRV_SEQ_LFLG_INPUT)
+		client->accept_input = 1;
+	if (mode & SNDRV_SEQ_LFLG_OUTPUT)
+		client->accept_output = 1;
+
+	user = &client->data.user;
+	user->fifo = NULL;
+	user->fifo_pool_size = 0;
+
+	if (mode & SNDRV_SEQ_LFLG_INPUT) {
+		user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
+		user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
+		if (user->fifo == NULL) {
+			seq_free_client1(client);
+			kfree(client);
+			up(&register_mutex);
+			return -ENOMEM;
+		}
+	}
+
+	usage_alloc(&client_usage, 1);
+	client->type = USER_CLIENT;
+	up(&register_mutex);
+
+	c = client->number;
+	file->private_data = client;
+
+	/* fill client data */
+	user->file = file;
+	sprintf(client->name, "Client-%d", c);
+
+	/* make others aware this new client */
+	snd_seq_system_client_ev_client_start(c);
+
+	return 0;
+}
+
+/* delete a user client */
+static int snd_seq_release(struct inode *inode, struct file *file)
+{
+	client_t *client = (client_t *) file->private_data;
+
+	if (client) {
+		seq_free_client(client);
+		if (client->data.user.fifo)
+			snd_seq_fifo_delete(&client->data.user.fifo);
+		kfree(client);
+	}
+
+	return 0;
+}
+
+
+/* handle client read() */
+/* possible error values:
+ *	-ENXIO	invalid client or file open mode
+ *	-ENOSPC	FIFO overflow (the flag is cleared after this error report)
+ *	-EINVAL	no enough user-space buffer to write the whole event
+ *	-EFAULT	seg. fault during copy to user space
+ */
+static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	client_t *client = (client_t *) file->private_data;
+	fifo_t *fifo;
+	int err;
+	long result = 0;
+	snd_seq_event_cell_t *cell;
+
+	if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
+		return -ENXIO;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	/* check client structures are in place */
+	snd_assert(client != NULL, return -ENXIO);
+
+	if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
+		return -ENXIO;
+
+	if (atomic_read(&fifo->overflow) > 0) {
+		/* buffer overflow is detected */
+		snd_seq_fifo_clear(fifo);
+		/* return error code */
+		return -ENOSPC;
+	}
+
+	cell = NULL;
+	err = 0;
+	snd_seq_fifo_lock(fifo);
+
+	/* while data available in queue */
+	while (count >= sizeof(snd_seq_event_t)) {
+		int nonblock;
+
+		nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
+		if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
+			break;
+		}
+		if (snd_seq_ev_is_variable(&cell->event)) {
+			snd_seq_event_t tmpev;
+			tmpev = cell->event;
+			tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
+			if (copy_to_user(buf, &tmpev, sizeof(snd_seq_event_t))) {
+				err = -EFAULT;
+				break;
+			}
+			count -= sizeof(snd_seq_event_t);
+			buf += sizeof(snd_seq_event_t);
+			err = snd_seq_expand_var_event(&cell->event, count, (char *)buf, 0, sizeof(snd_seq_event_t));
+			if (err < 0)
+				break;
+			result += err;
+			count -= err;
+			buf += err;
+		} else {
+			if (copy_to_user(buf, &cell->event, sizeof(snd_seq_event_t))) {
+				err = -EFAULT;
+				break;
+			}
+			count -= sizeof(snd_seq_event_t);
+			buf += sizeof(snd_seq_event_t);
+		}
+		snd_seq_cell_free(cell);
+		cell = NULL; /* to be sure */
+		result += sizeof(snd_seq_event_t);
+	}
+
+	if (err < 0) {
+		if (cell)
+			snd_seq_fifo_cell_putback(fifo, cell);
+		if (err == -EAGAIN && result > 0)
+			err = 0;
+	}
+	snd_seq_fifo_unlock(fifo);
+
+	return (err < 0) ? err : result;
+}
+
+
+/*
+ * check access permission to the port
+ */
+static int check_port_perm(client_port_t *port, unsigned int flags)
+{
+	if ((port->capability & flags) != flags)
+		return 0;
+	return flags;
+}
+
+/*
+ * check if the destination client is available, and return the pointer
+ * if filter is non-zero, client filter bitmap is tested.
+ */
+static client_t *get_event_dest_client(snd_seq_event_t *event, int filter)
+{
+	client_t *dest;
+
+	dest = snd_seq_client_use_ptr(event->dest.client);
+	if (dest == NULL)
+		return NULL;
+	if (! dest->accept_input)
+		goto __not_avail;
+	if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
+	    ! test_bit(event->type, dest->event_filter))
+		goto __not_avail;
+	if (filter && !(dest->filter & filter))
+		goto __not_avail;
+
+	return dest; /* ok - accessible */
+__not_avail:
+	snd_seq_client_unlock(dest);
+	return NULL;
+}
+
+
+/*
+ * Return the error event.
+ *
+ * If the receiver client is a user client, the original event is
+ * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
+ * the original event is also variable length, the external data is
+ * copied after the event record. 
+ * If the receiver client is a kernel client, the original event is
+ * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
+ * kmalloc.
+ */
+static int bounce_error_event(client_t *client, snd_seq_event_t *event,
+			      int err, int atomic, int hop)
+{
+	snd_seq_event_t bounce_ev;
+	int result;
+
+	if (client == NULL ||
+	    ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
+	    ! client->accept_input)
+		return 0; /* ignored */
+
+	/* set up quoted error */
+	memset(&bounce_ev, 0, sizeof(bounce_ev));
+	bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
+	bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
+	bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
+	bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
+	bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
+	bounce_ev.dest.client = client->number;
+	bounce_ev.dest.port = event->source.port;
+	bounce_ev.data.quote.origin = event->dest;
+	bounce_ev.data.quote.event = event;
+	bounce_ev.data.quote.value = -err; /* use positive value */
+	result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
+	if (result < 0) {
+		client->event_lost++;
+		return result;
+	}
+
+	return result;
+}
+
+
+/*
+ * rewrite the time-stamp of the event record with the curren time
+ * of the given queue.
+ * return non-zero if updated.
+ */
+static int update_timestamp_of_queue(snd_seq_event_t *event, int queue, int real_time)
+{
+	queue_t *q;
+
+	q = queueptr(queue);
+	if (! q)
+		return 0;
+	event->queue = queue;
+	event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
+	if (real_time) {
+		event->time.time = snd_seq_timer_get_cur_time(q->timer);
+		event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
+	} else {
+		event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
+		event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
+	}
+	queuefree(q);
+	return 1;
+}
+
+
+/*
+ * deliver an event to the specified destination.
+ * if filter is non-zero, client filter bitmap is tested.
+ *
+ *  RETURN VALUE: 0 : if succeeded
+ *		 <0 : error
+ */
+static int snd_seq_deliver_single_event(client_t *client,
+					snd_seq_event_t *event,
+					int filter, int atomic, int hop)
+{
+	client_t *dest = NULL;
+	client_port_t *dest_port = NULL;
+	int result = -ENOENT;
+	int direct;
+
+	direct = snd_seq_ev_is_direct(event);
+
+	dest = get_event_dest_client(event, filter);
+	if (dest == NULL)
+		goto __skip;
+	dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
+	if (dest_port == NULL)
+		goto __skip;
+
+	/* check permission */
+	if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
+		result = -EPERM;
+		goto __skip;
+	}
+		
+	if (dest_port->timestamping)
+		update_timestamp_of_queue(event, dest_port->time_queue,
+					  dest_port->time_real);
+
+	switch (dest->type) {
+	case USER_CLIENT:
+		if (dest->data.user.fifo)
+			result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
+		break;
+
+	case KERNEL_CLIENT:
+		if (dest_port->event_input == NULL)
+			break;
+		result = dest_port->event_input(event, direct, dest_port->private_data, atomic, hop);
+		break;
+	default:
+		break;
+	}
+
+  __skip:
+	if (dest_port)
+		snd_seq_port_unlock(dest_port);
+	if (dest)
+		snd_seq_client_unlock(dest);
+
+	if (result < 0 && !direct) {
+		result = bounce_error_event(client, event, result, atomic, hop);
+	}
+	return result;
+}
+
+
+/*
+ * send the event to all subscribers:
+ */
+static int deliver_to_subscribers(client_t *client,
+				  snd_seq_event_t *event,
+				  int atomic, int hop)
+{
+	subscribers_t *subs;
+	int err = 0, num_ev = 0;
+	snd_seq_event_t event_saved;
+	client_port_t *src_port;
+	struct list_head *p;
+	port_subs_info_t *grp;
+
+	src_port = snd_seq_port_use_ptr(client, event->source.port);
+	if (src_port == NULL)
+		return -EINVAL; /* invalid source port */
+	/* save original event record */
+	event_saved = *event;
+	grp = &src_port->c_src;
+	
+	/* lock list */
+	if (atomic)
+		read_lock(&grp->list_lock);
+	else
+		down_read(&grp->list_mutex);
+	list_for_each(p, &grp->list_head) {
+		subs = list_entry(p, subscribers_t, src_list);
+		event->dest = subs->info.dest;
+		if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
+			/* convert time according to flag with subscription */
+			update_timestamp_of_queue(event, subs->info.queue,
+						  subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
+		err = snd_seq_deliver_single_event(client, event,
+						   0, atomic, hop);
+		if (err < 0)
+			break;
+		num_ev++;
+		/* restore original event record */
+		*event = event_saved;
+	}
+	if (atomic)
+		read_unlock(&grp->list_lock);
+	else
+		up_read(&grp->list_mutex);
+	*event = event_saved; /* restore */
+	snd_seq_port_unlock(src_port);
+	return (err < 0) ? err : num_ev;
+}
+
+
+#ifdef SUPPORT_BROADCAST 
+/*
+ * broadcast to all ports:
+ */
+static int port_broadcast_event(client_t *client,
+				snd_seq_event_t *event,
+				int atomic, int hop)
+{
+	int num_ev = 0, err = 0;
+	client_t *dest_client;
+	struct list_head *p;
+
+	dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
+	if (dest_client == NULL)
+		return 0; /* no matching destination */
+
+	read_lock(&dest_client->ports_lock);
+	list_for_each(p, &dest_client->ports_list_head) {
+		client_port_t *port = list_entry(p, client_port_t, list);
+		event->dest.port = port->addr.port;
+		/* pass NULL as source client to avoid error bounce */
+		err = snd_seq_deliver_single_event(NULL, event,
+						   SNDRV_SEQ_FILTER_BROADCAST,
+						   atomic, hop);
+		if (err < 0)
+			break;
+		num_ev++;
+	}
+	read_unlock(&dest_client->ports_lock);
+	snd_seq_client_unlock(dest_client);
+	event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
+	return (err < 0) ? err : num_ev;
+}
+
+/*
+ * send the event to all clients:
+ * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
+ */
+static int broadcast_event(client_t *client,
+			   snd_seq_event_t *event, int atomic, int hop)
+{
+	int err = 0, num_ev = 0;
+	int dest;
+	snd_seq_addr_t addr;
+
+	addr = event->dest; /* save */
+
+	for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
+		/* don't send to itself */
+		if (dest == client->number)
+			continue;
+		event->dest.client = dest;
+		event->dest.port = addr.port;
+		if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
+			err = port_broadcast_event(client, event, atomic, hop);
+		else
+			/* pass NULL as source client to avoid error bounce */
+			err = snd_seq_deliver_single_event(NULL, event,
+							   SNDRV_SEQ_FILTER_BROADCAST,
+							   atomic, hop);
+		if (err < 0)
+			break;
+		num_ev += err;
+	}
+	event->dest = addr; /* restore */
+	return (err < 0) ? err : num_ev;
+}
+
+
+/* multicast - not supported yet */
+static int multicast_event(client_t *client, snd_seq_event_t *event,
+			   int atomic, int hop)
+{
+	snd_printd("seq: multicast not supported yet.\n");
+	return 0; /* ignored */
+}
+#endif /* SUPPORT_BROADCAST */
+
+
+/* deliver an event to the destination port(s).
+ * if the event is to subscribers or broadcast, the event is dispatched
+ * to multiple targets.
+ *
+ * RETURN VALUE: n > 0  : the number of delivered events.
+ *               n == 0 : the event was not passed to any client.
+ *               n < 0  : error - event was not processed.
+ */
+static int snd_seq_deliver_event(client_t *client, snd_seq_event_t *event,
+				 int atomic, int hop)
+{
+	int result;
+
+	hop++;
+	if (hop >= SNDRV_SEQ_MAX_HOPS) {
+		snd_printd("too long delivery path (%d:%d->%d:%d)\n",
+			   event->source.client, event->source.port,
+			   event->dest.client, event->dest.port);
+		return -EMLINK;
+	}
+
+	if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
+	    event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
+		result = deliver_to_subscribers(client, event, atomic, hop);
+#ifdef SUPPORT_BROADCAST
+	else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
+		 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
+		result = broadcast_event(client, event, atomic, hop);
+	else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
+		result = multicast_event(client, event, atomic, hop);
+	else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
+		result = port_broadcast_event(client, event, atomic, hop);
+#endif
+	else
+		result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
+
+	return result;
+}
+
+/*
+ * dispatch an event cell:
+ * This function is called only from queue check routines in timer
+ * interrupts or after enqueued.
+ * The event cell shall be released or re-queued in this function.
+ *
+ * RETURN VALUE: n > 0  : the number of delivered events.
+ *		 n == 0 : the event was not passed to any client.
+ *		 n < 0  : error - event was not processed.
+ */
+int snd_seq_dispatch_event(snd_seq_event_cell_t *cell, int atomic, int hop)
+{
+	client_t *client;
+	int result;
+
+	snd_assert(cell != NULL, return -EINVAL);
+
+	client = snd_seq_client_use_ptr(cell->event.source.client);
+	if (client == NULL) {
+		snd_seq_cell_free(cell); /* release this cell */
+		return -EINVAL;
+	}
+
+	if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
+		/* NOTE event:
+		 * the event cell is re-used as a NOTE-OFF event and
+		 * enqueued again.
+		 */
+		snd_seq_event_t tmpev, *ev;
+
+		/* reserve this event to enqueue note-off later */
+		tmpev = cell->event;
+		tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
+		result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
+
+		/*
+		 * This was originally a note event.  We now re-use the
+		 * cell for the note-off event.
+		 */
+
+		ev = &cell->event;
+		ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
+		ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
+
+		/* add the duration time */
+		switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
+		case SNDRV_SEQ_TIME_STAMP_TICK:
+			ev->time.tick += ev->data.note.duration;
+			break;
+		case SNDRV_SEQ_TIME_STAMP_REAL:
+			/* unit for duration is ms */
+			ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
+			ev->time.time.tv_sec += ev->data.note.duration / 1000 +
+						ev->time.time.tv_nsec / 1000000000;
+			ev->time.time.tv_nsec %= 1000000000;
+			break;
+		}
+		ev->data.note.velocity = ev->data.note.off_velocity;
+
+		/* Now queue this cell as the note off event */
+		if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
+			snd_seq_cell_free(cell); /* release this cell */
+
+	} else {
+		/* Normal events:
+		 * event cell is freed after processing the event
+		 */
+
+		result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
+		snd_seq_cell_free(cell);
+	}
+
+	snd_seq_client_unlock(client);
+	return result;
+}
+
+
+/* Allocate a cell from client pool and enqueue it to queue:
+ * if pool is empty and blocking is TRUE, sleep until a new cell is
+ * available.
+ */
+static int snd_seq_client_enqueue_event(client_t *client,
+					snd_seq_event_t *event,
+					struct file *file, int blocking,
+					int atomic, int hop)
+{
+	snd_seq_event_cell_t *cell;
+	int err;
+
+	/* special queue values - force direct passing */
+	if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
+		event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
+		event->queue = SNDRV_SEQ_QUEUE_DIRECT;
+	} else
+#ifdef SUPPORT_BROADCAST
+		if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
+			event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
+			event->queue = SNDRV_SEQ_QUEUE_DIRECT;
+		}
+#endif
+	if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
+		/* check presence of source port */
+		client_port_t *src_port = snd_seq_port_use_ptr(client, event->source.port);
+		if (src_port == NULL)
+			return -EINVAL;
+		snd_seq_port_unlock(src_port);
+	}
+
+	/* direct event processing without enqueued */
+	if (snd_seq_ev_is_direct(event)) {
+		if (event->type == SNDRV_SEQ_EVENT_NOTE)
+			return -EINVAL; /* this event must be enqueued! */
+		return snd_seq_deliver_event(client, event, atomic, hop);
+	}
+
+	/* Not direct, normal queuing */
+	if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
+		return -EINVAL;  /* invalid queue */
+	if (! snd_seq_write_pool_allocated(client))
+		return -ENXIO; /* queue is not allocated */
+
+	/* allocate an event cell */
+	err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
+	if (err < 0)
+		return err;
+
+	/* we got a cell. enqueue it. */
+	if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
+		snd_seq_cell_free(cell);
+		return err;
+	}
+
+	return 0;
+}
+
+
+/*
+ * check validity of event type and data length.
+ * return non-zero if invalid.
+ */
+static int check_event_type_and_length(snd_seq_event_t *ev)
+{
+	switch (snd_seq_ev_length_type(ev)) {
+	case SNDRV_SEQ_EVENT_LENGTH_FIXED:
+		if (snd_seq_ev_is_variable_type(ev))
+			return -EINVAL;
+		break;
+	case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
+		if (! snd_seq_ev_is_variable_type(ev) ||
+		    (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
+			return -EINVAL;
+		break;
+	case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
+		if (! snd_seq_ev_is_instr_type(ev) ||
+		    ! snd_seq_ev_is_direct(ev))
+			return -EINVAL;
+		break;
+	}
+	return 0;
+}
+
+
+/* handle write() */
+/* possible error values:
+ *	-ENXIO	invalid client or file open mode
+ *	-ENOMEM	malloc failed
+ *	-EFAULT	seg. fault during copy from user space
+ *	-EINVAL	invalid event
+ *	-EAGAIN	no space in output pool
+ *	-EINTR	interrupts while sleep
+ *	-EMLINK	too many hops
+ *	others	depends on return value from driver callback
+ */
+static ssize_t snd_seq_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
+{
+	client_t *client = (client_t *) file->private_data;
+	int written = 0, len;
+	int err = -EINVAL;
+	snd_seq_event_t event;
+
+	if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
+		return -ENXIO;
+
+	/* check client structures are in place */
+	snd_assert(client != NULL, return -ENXIO);
+		
+	if (!client->accept_output || client->pool == NULL)
+		return -ENXIO;
+
+	/* allocate the pool now if the pool is not allocated yet */ 
+	if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
+		if (snd_seq_pool_init(client->pool) < 0)
+			return -ENOMEM;
+	}
+
+	/* only process whole events */
+	while (count >= sizeof(snd_seq_event_t)) {
+		/* Read in the event header from the user */
+		len = sizeof(event);
+		if (copy_from_user(&event, buf, len)) {
+			err = -EFAULT;
+			break;
+		}
+		event.source.client = client->number;	/* fill in client number */
+		/* Check for extension data length */
+		if (check_event_type_and_length(&event)) {
+			err = -EINVAL;
+			break;
+		}
+
+		/* check for special events */
+		if (event.type == SNDRV_SEQ_EVENT_NONE)
+			goto __skip_event;
+		else if (snd_seq_ev_is_reserved(&event)) {
+			err = -EINVAL;
+			break;
+		}
+
+		if (snd_seq_ev_is_variable(&event)) {
+			int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
+			if ((size_t)(extlen + len) > count) {
+				/* back out, will get an error this time or next */
+				err = -EINVAL;
+				break;
+			}
+			/* set user space pointer */
+			event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
+			event.data.ext.ptr = (char*)buf + sizeof(snd_seq_event_t);
+			len += extlen; /* increment data length */
+		} else {
+#ifdef CONFIG_COMPAT
+			if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
+				void *ptr = compat_ptr(event.data.raw32.d[1]);
+				event.data.ext.ptr = ptr;
+			}
+#endif
+		}
+
+		/* ok, enqueue it */
+		err = snd_seq_client_enqueue_event(client, &event, file,
+						   !(file->f_flags & O_NONBLOCK),
+						   0, 0);
+		if (err < 0)
+			break;
+
+	__skip_event:
+		/* Update pointers and counts */
+		count -= len;
+		buf += len;
+		written += len;
+	}
+
+	return written ? written : err;
+}
+
+
+/*
+ * handle polling
+ */
+static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
+{
+	client_t *client = (client_t *) file->private_data;
+	unsigned int mask = 0;
+
+	/* check client structures are in place */
+	snd_assert(client != NULL, return -ENXIO);
+
+	if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
+	    client->data.user.fifo) {
+
+		/* check if data is available in the outqueue */
+		if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
+			mask |= POLLIN | POLLRDNORM;
+	}
+
+	if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
+
+		/* check if data is available in the pool */
+		if (!snd_seq_write_pool_allocated(client) ||
+		    snd_seq_pool_poll_wait(client->pool, file, wait))
+			mask |= POLLOUT | POLLWRNORM;
+	}
+
+	return mask;
+}
+
+
+/*-----------------------------------------------------*/
+
+
+/* SYSTEM_INFO ioctl() */
+static int snd_seq_ioctl_system_info(client_t *client, void __user *arg)
+{
+	snd_seq_system_info_t info;
+
+	memset(&info, 0, sizeof(info));
+	/* fill the info fields */
+	info.queues = SNDRV_SEQ_MAX_QUEUES;
+	info.clients = SNDRV_SEQ_MAX_CLIENTS;
+	info.ports = 256;	/* fixed limit */
+	info.channels = 256;	/* fixed limit */
+	info.cur_clients = client_usage.cur;
+	info.cur_queues = snd_seq_queue_get_cur_queues();
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* RUNNING_MODE ioctl() */
+static int snd_seq_ioctl_running_mode(client_t *client, void __user *arg)
+{
+	struct sndrv_seq_running_info info;
+	client_t *cptr;
+	int err = 0;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	/* requested client number */
+	cptr = snd_seq_client_use_ptr(info.client);
+	if (cptr == NULL)
+		return -ENOENT;		/* don't change !!! */
+
+#ifdef SNDRV_BIG_ENDIAN
+	if (! info.big_endian) {
+		err = -EINVAL;
+		goto __err;
+	}
+#else
+	if (info.big_endian) {
+		err = -EINVAL;
+		goto __err;
+	}
+
+#endif
+	if (info.cpu_mode > sizeof(long)) {
+		err = -EINVAL;
+		goto __err;
+	}
+	cptr->convert32 = (info.cpu_mode < sizeof(long));
+ __err:
+	snd_seq_client_unlock(cptr);
+	return err;
+}
+
+/* CLIENT_INFO ioctl() */
+static void get_client_info(client_t *cptr, snd_seq_client_info_t *info)
+{
+	info->client = cptr->number;
+
+	/* fill the info fields */
+	info->type = cptr->type;
+	strcpy(info->name, cptr->name);
+	info->filter = cptr->filter;
+	info->event_lost = cptr->event_lost;
+	memcpy(info->event_filter, cptr->event_filter, 32);
+	info->num_ports = cptr->num_ports;
+	memset(info->reserved, 0, sizeof(info->reserved));
+}
+
+static int snd_seq_ioctl_get_client_info(client_t * client, void __user *arg)
+{
+	client_t *cptr;
+	snd_seq_client_info_t client_info;
+
+	if (copy_from_user(&client_info, arg, sizeof(client_info)))
+		return -EFAULT;
+
+	/* requested client number */
+	cptr = snd_seq_client_use_ptr(client_info.client);
+	if (cptr == NULL)
+		return -ENOENT;		/* don't change !!! */
+
+	get_client_info(cptr, &client_info);
+	snd_seq_client_unlock(cptr);
+
+	if (copy_to_user(arg, &client_info, sizeof(client_info)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* CLIENT_INFO ioctl() */
+static int snd_seq_ioctl_set_client_info(client_t * client, void __user *arg)
+{
+	snd_seq_client_info_t client_info;
+
+	if (copy_from_user(&client_info, arg, sizeof(client_info)))
+		return -EFAULT;
+
+	/* it is not allowed to set the info fields for an another client */
+	if (client->number != client_info.client)
+		return -EPERM;
+	/* also client type must be set now */
+	if (client->type != client_info.type)
+		return -EINVAL;
+
+	/* fill the info fields */
+	if (client_info.name[0])
+		strlcpy(client->name, client_info.name, sizeof(client->name));
+
+	client->filter = client_info.filter;
+	client->event_lost = client_info.event_lost;
+	memcpy(client->event_filter, client_info.event_filter, 32);
+
+	return 0;
+}
+
+
+/* 
+ * CREATE PORT ioctl() 
+ */
+static int snd_seq_ioctl_create_port(client_t * client, void __user *arg)
+{
+	client_port_t *port;
+	snd_seq_port_info_t info;
+	snd_seq_port_callback_t *callback;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	/* it is not allowed to create the port for an another client */
+	if (info.addr.client != client->number)
+		return -EPERM;
+
+	port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
+	if (port == NULL)
+		return -ENOMEM;
+
+	if (client->type == USER_CLIENT && info.kernel) {
+		snd_seq_delete_port(client, port->addr.port);
+		return -EINVAL;
+	}
+	if (client->type == KERNEL_CLIENT) {
+		if ((callback = info.kernel) != NULL) {
+			if (callback->owner)
+				port->owner = callback->owner;
+			port->private_data = callback->private_data;
+			port->private_free = callback->private_free;
+			port->callback_all = callback->callback_all;
+			port->event_input = callback->event_input;
+			port->c_src.open = callback->subscribe;
+			port->c_src.close = callback->unsubscribe;
+			port->c_dest.open = callback->use;
+			port->c_dest.close = callback->unuse;
+		}
+	}
+
+	info.addr = port->addr;
+
+	snd_seq_set_port_info(port, &info);
+	snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/* 
+ * DELETE PORT ioctl() 
+ */
+static int snd_seq_ioctl_delete_port(client_t * client, void __user *arg)
+{
+	snd_seq_port_info_t info;
+	int err;
+
+	/* set passed parameters */
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+	
+	/* it is not allowed to remove the port for an another client */
+	if (info.addr.client != client->number)
+		return -EPERM;
+
+	err = snd_seq_delete_port(client, info.addr.port);
+	if (err >= 0)
+		snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
+	return err;
+}
+
+
+/* 
+ * GET_PORT_INFO ioctl() (on any client) 
+ */
+static int snd_seq_ioctl_get_port_info(client_t *client, void __user *arg)
+{
+	client_t *cptr;
+	client_port_t *port;
+	snd_seq_port_info_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+	cptr = snd_seq_client_use_ptr(info.addr.client);
+	if (cptr == NULL)
+		return -ENXIO;
+
+	port = snd_seq_port_use_ptr(cptr, info.addr.port);
+	if (port == NULL) {
+		snd_seq_client_unlock(cptr);
+		return -ENOENT;			/* don't change */
+	}
+
+	/* get port info */
+	snd_seq_get_port_info(port, &info);
+	snd_seq_port_unlock(port);
+	snd_seq_client_unlock(cptr);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* 
+ * SET_PORT_INFO ioctl() (only ports on this/own client) 
+ */
+static int snd_seq_ioctl_set_port_info(client_t * client, void __user *arg)
+{
+	client_port_t *port;
+	snd_seq_port_info_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	if (info.addr.client != client->number) /* only set our own ports ! */
+		return -EPERM;
+	port = snd_seq_port_use_ptr(client, info.addr.port);
+	if (port) {
+		snd_seq_set_port_info(port, &info);
+		snd_seq_port_unlock(port);
+	}
+	return 0;
+}
+
+
+/*
+ * port subscription (connection)
+ */
+#define PERM_RD		(SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
+#define PERM_WR		(SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
+
+static int check_subscription_permission(client_t *client, client_port_t *sport,
+					 client_port_t *dport,
+					 snd_seq_port_subscribe_t *subs)
+{
+	if (client->number != subs->sender.client &&
+	    client->number != subs->dest.client) {
+		/* connection by third client - check export permission */
+		if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
+			return -EPERM;
+		if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
+			return -EPERM;
+	}
+
+	/* check read permission */
+	/* if sender or receiver is the subscribing client itself,
+	 * no permission check is necessary
+	 */
+	if (client->number != subs->sender.client) {
+		if (! check_port_perm(sport, PERM_RD))
+			return -EPERM;
+	}
+	/* check write permission */
+	if (client->number != subs->dest.client) {
+		if (! check_port_perm(dport, PERM_WR))
+			return -EPERM;
+	}
+	return 0;
+}
+
+/*
+ * send an subscription notify event to user client:
+ * client must be user client.
+ */
+int snd_seq_client_notify_subscription(int client, int port,
+				       snd_seq_port_subscribe_t *info, int evtype)
+{
+	snd_seq_event_t event;
+
+	memset(&event, 0, sizeof(event));
+	event.type = evtype;
+	event.data.connect.dest = info->dest;
+	event.data.connect.sender = info->sender;
+
+	return snd_seq_system_notify(client, port, &event);  /* non-atomic */
+}
+
+
+/* 
+ * add to port's subscription list IOCTL interface 
+ */
+static int snd_seq_ioctl_subscribe_port(client_t * client, void __user *arg)
+{
+	int result = -EINVAL;
+	client_t *receiver = NULL, *sender = NULL;
+	client_port_t *sport = NULL, *dport = NULL;
+	snd_seq_port_subscribe_t subs;
+
+	if (copy_from_user(&subs, arg, sizeof(subs)))
+		return -EFAULT;
+
+	if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
+		goto __end;
+	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
+		goto __end;
+	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
+		goto __end;
+	if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
+		goto __end;
+
+	result = check_subscription_permission(client, sport, dport, &subs);
+	if (result < 0)
+		goto __end;
+
+	/* connect them */
+	result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
+	if (! result) /* broadcast announce */
+		snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
+						   &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
+      __end:
+      	if (sport)
+		snd_seq_port_unlock(sport);
+	if (dport)
+		snd_seq_port_unlock(dport);
+	if (sender)
+		snd_seq_client_unlock(sender);
+	if (receiver)
+		snd_seq_client_unlock(receiver);
+	return result;
+}
+
+
+/* 
+ * remove from port's subscription list 
+ */
+static int snd_seq_ioctl_unsubscribe_port(client_t * client, void __user *arg)
+{
+	int result = -ENXIO;
+	client_t *receiver = NULL, *sender = NULL;
+	client_port_t *sport = NULL, *dport = NULL;
+	snd_seq_port_subscribe_t subs;
+
+	if (copy_from_user(&subs, arg, sizeof(subs)))
+		return -EFAULT;
+
+	if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
+		goto __end;
+	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
+		goto __end;
+	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
+		goto __end;
+	if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
+		goto __end;
+
+	result = check_subscription_permission(client, sport, dport, &subs);
+	if (result < 0)
+		goto __end;
+
+	result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
+	if (! result) /* broadcast announce */
+		snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
+						   &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
+      __end:
+      	if (sport)
+		snd_seq_port_unlock(sport);
+	if (dport)
+		snd_seq_port_unlock(dport);
+	if (sender)
+		snd_seq_client_unlock(sender);
+	if (receiver)
+		snd_seq_client_unlock(receiver);
+	return result;
+}
+
+
+/* CREATE_QUEUE ioctl() */
+static int snd_seq_ioctl_create_queue(client_t *client, void __user *arg)
+{
+	snd_seq_queue_info_t info;
+	int result;
+	queue_t *q;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
+	if (result < 0)
+		return result;
+
+	q = queueptr(result);
+	if (q == NULL)
+		return -EINVAL;
+
+	info.queue = q->queue;
+	info.locked = q->locked;
+	info.owner = q->owner;
+
+	/* set queue name */
+	if (! info.name[0])
+		snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
+	strlcpy(q->name, info.name, sizeof(q->name));
+	queuefree(q);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/* DELETE_QUEUE ioctl() */
+static int snd_seq_ioctl_delete_queue(client_t *client, void __user *arg)
+{
+	snd_seq_queue_info_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	return snd_seq_queue_delete(client->number, info.queue);
+}
+
+/* GET_QUEUE_INFO ioctl() */
+static int snd_seq_ioctl_get_queue_info(client_t *client, void __user *arg)
+{
+	snd_seq_queue_info_t info;
+	queue_t *q;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	q = queueptr(info.queue);
+	if (q == NULL)
+		return -EINVAL;
+
+	memset(&info, 0, sizeof(info));
+	info.queue = q->queue;
+	info.owner = q->owner;
+	info.locked = q->locked;
+	strlcpy(info.name, q->name, sizeof(info.name));
+	queuefree(q);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/* SET_QUEUE_INFO ioctl() */
+static int snd_seq_ioctl_set_queue_info(client_t *client, void __user *arg)
+{
+	snd_seq_queue_info_t info;
+	queue_t *q;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	if (info.owner != client->number)
+		return -EINVAL;
+
+	/* change owner/locked permission */
+	if (snd_seq_queue_check_access(info.queue, client->number)) {
+		if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
+			return -EPERM;
+		if (info.locked)
+			snd_seq_queue_use(info.queue, client->number, 1);
+	} else {
+		return -EPERM;
+	}	
+
+	q = queueptr(info.queue);
+	if (! q)
+		return -EINVAL;
+	if (q->owner != client->number) {
+		queuefree(q);
+		return -EPERM;
+	}
+	strlcpy(q->name, info.name, sizeof(q->name));
+	queuefree(q);
+
+	return 0;
+}
+
+/* GET_NAMED_QUEUE ioctl() */
+static int snd_seq_ioctl_get_named_queue(client_t *client, void __user *arg)
+{
+	snd_seq_queue_info_t info;
+	queue_t *q;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	q = snd_seq_queue_find_name(info.name);
+	if (q == NULL)
+		return -EINVAL;
+	info.queue = q->queue;
+	info.owner = q->owner;
+	info.locked = q->locked;
+	queuefree(q);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/* GET_QUEUE_STATUS ioctl() */
+static int snd_seq_ioctl_get_queue_status(client_t * client, void __user *arg)
+{
+	snd_seq_queue_status_t status;
+	queue_t *queue;
+	seq_timer_t *tmr;
+
+	if (copy_from_user(&status, arg, sizeof(status)))
+		return -EFAULT;
+
+	queue = queueptr(status.queue);
+	if (queue == NULL)
+		return -EINVAL;
+	memset(&status, 0, sizeof(status));
+	status.queue = queue->queue;
+	
+	tmr = queue->timer;
+	status.events = queue->tickq->cells + queue->timeq->cells;
+
+	status.time = snd_seq_timer_get_cur_time(tmr);
+	status.tick = snd_seq_timer_get_cur_tick(tmr);
+
+	status.running = tmr->running;
+
+	status.flags = queue->flags;
+	queuefree(queue);
+
+	if (copy_to_user(arg, &status, sizeof(status)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* GET_QUEUE_TEMPO ioctl() */
+static int snd_seq_ioctl_get_queue_tempo(client_t * client, void __user *arg)
+{
+	snd_seq_queue_tempo_t tempo;
+	queue_t *queue;
+	seq_timer_t *tmr;
+
+	if (copy_from_user(&tempo, arg, sizeof(tempo)))
+		return -EFAULT;
+
+	queue = queueptr(tempo.queue);
+	if (queue == NULL)
+		return -EINVAL;
+	memset(&tempo, 0, sizeof(tempo));
+	tempo.queue = queue->queue;
+	
+	tmr = queue->timer;
+
+	tempo.tempo = tmr->tempo;
+	tempo.ppq = tmr->ppq;
+	tempo.skew_value = tmr->skew;
+	tempo.skew_base = tmr->skew_base;
+	queuefree(queue);
+
+	if (copy_to_user(arg, &tempo, sizeof(tempo)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* SET_QUEUE_TEMPO ioctl() */
+int snd_seq_set_queue_tempo(int client, snd_seq_queue_tempo_t *tempo)
+{
+	if (!snd_seq_queue_check_access(tempo->queue, client))
+		return -EPERM;
+	return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
+}
+
+static int snd_seq_ioctl_set_queue_tempo(client_t * client, void __user *arg)
+{
+	int result;
+	snd_seq_queue_tempo_t tempo;
+
+	if (copy_from_user(&tempo, arg, sizeof(tempo)))
+		return -EFAULT;
+
+	result = snd_seq_set_queue_tempo(client->number, &tempo);
+	return result < 0 ? result : 0;
+}
+
+
+/* GET_QUEUE_TIMER ioctl() */
+static int snd_seq_ioctl_get_queue_timer(client_t * client, void __user *arg)
+{
+	snd_seq_queue_timer_t timer;
+	queue_t *queue;
+	seq_timer_t *tmr;
+
+	if (copy_from_user(&timer, arg, sizeof(timer)))
+		return -EFAULT;
+
+	queue = queueptr(timer.queue);
+	if (queue == NULL)
+		return -EINVAL;
+
+	if (down_interruptible(&queue->timer_mutex)) {
+		queuefree(queue);
+		return -ERESTARTSYS;
+	}
+	tmr = queue->timer;
+	memset(&timer, 0, sizeof(timer));
+	timer.queue = queue->queue;
+
+	timer.type = tmr->type;
+	if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
+		timer.u.alsa.id = tmr->alsa_id;
+		timer.u.alsa.resolution = tmr->preferred_resolution;
+	}
+	up(&queue->timer_mutex);
+	queuefree(queue);
+	
+	if (copy_to_user(arg, &timer, sizeof(timer)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* SET_QUEUE_TIMER ioctl() */
+static int snd_seq_ioctl_set_queue_timer(client_t * client, void __user *arg)
+{
+	int result = 0;
+	snd_seq_queue_timer_t timer;
+
+	if (copy_from_user(&timer, arg, sizeof(timer)))
+		return -EFAULT;
+
+	if (timer.type != SNDRV_SEQ_TIMER_ALSA)
+		return -EINVAL;
+
+	if (snd_seq_queue_check_access(timer.queue, client->number)) {
+		queue_t *q;
+		seq_timer_t *tmr;
+
+		q = queueptr(timer.queue);
+		if (q == NULL)
+			return -ENXIO;
+		if (down_interruptible(&q->timer_mutex)) {
+			queuefree(q);
+			return -ERESTARTSYS;
+		}
+		tmr = q->timer;
+		snd_seq_queue_timer_close(timer.queue);
+		tmr->type = timer.type;
+		if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
+			tmr->alsa_id = timer.u.alsa.id;
+			tmr->preferred_resolution = timer.u.alsa.resolution;
+		}
+		result = snd_seq_queue_timer_open(timer.queue);
+		up(&q->timer_mutex);
+		queuefree(q);
+	} else {
+		return -EPERM;
+	}	
+
+	return result;
+}
+
+
+/* GET_QUEUE_CLIENT ioctl() */
+static int snd_seq_ioctl_get_queue_client(client_t * client, void __user *arg)
+{
+	snd_seq_queue_client_t info;
+	int used;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	used = snd_seq_queue_is_used(info.queue, client->number);
+	if (used < 0)
+		return -EINVAL;
+	info.used = used;
+	info.client = client->number;
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+
+/* SET_QUEUE_CLIENT ioctl() */
+static int snd_seq_ioctl_set_queue_client(client_t * client, void __user *arg)
+{
+	int err;
+	snd_seq_queue_client_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	if (info.used >= 0) {
+		err = snd_seq_queue_use(info.queue, client->number, info.used);
+		if (err < 0)
+			return err;
+	}
+
+	return snd_seq_ioctl_get_queue_client(client, arg);
+}
+
+
+/* GET_CLIENT_POOL ioctl() */
+static int snd_seq_ioctl_get_client_pool(client_t * client, void __user *arg)
+{
+	snd_seq_client_pool_t info;
+	client_t *cptr;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	cptr = snd_seq_client_use_ptr(info.client);
+	if (cptr == NULL)
+		return -ENOENT;
+	memset(&info, 0, sizeof(info));
+	info.output_pool = cptr->pool->size;
+	info.output_room = cptr->pool->room;
+	info.output_free = info.output_pool;
+	if (cptr->pool)
+		info.output_free = snd_seq_unused_cells(cptr->pool);
+	if (cptr->type == USER_CLIENT) {
+		info.input_pool = cptr->data.user.fifo_pool_size;
+		info.input_free = info.input_pool;
+		if (cptr->data.user.fifo)
+			info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
+	} else {
+		info.input_pool = 0;
+		info.input_free = 0;
+	}
+	snd_seq_client_unlock(cptr);
+	
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+/* SET_CLIENT_POOL ioctl() */
+static int snd_seq_ioctl_set_client_pool(client_t * client, void __user *arg)
+{
+	snd_seq_client_pool_t info;
+	int rc;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	if (client->number != info.client)
+		return -EINVAL; /* can't change other clients */
+
+	if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
+	    (! snd_seq_write_pool_allocated(client) ||
+	     info.output_pool != client->pool->size)) {
+		if (snd_seq_write_pool_allocated(client)) {
+			/* remove all existing cells */
+			snd_seq_queue_client_leave_cells(client->number);
+			snd_seq_pool_done(client->pool);
+		}
+		client->pool->size = info.output_pool;
+		rc = snd_seq_pool_init(client->pool);
+		if (rc < 0)
+			return rc;
+	}
+	if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
+	    info.input_pool >= 1 &&
+	    info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
+	    info.input_pool != client->data.user.fifo_pool_size) {
+		/* change pool size */
+		rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
+		if (rc < 0)
+			return rc;
+		client->data.user.fifo_pool_size = info.input_pool;
+	}
+	if (info.output_room >= 1 &&
+	    info.output_room <= client->pool->size) {
+		client->pool->room  = info.output_room;
+	}
+
+	return snd_seq_ioctl_get_client_pool(client, arg);
+}
+
+
+/* REMOVE_EVENTS ioctl() */
+static int snd_seq_ioctl_remove_events(client_t * client, void __user *arg)
+{
+	snd_seq_remove_events_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	/*
+	 * Input mostly not implemented XXX.
+	 */
+	if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
+		/*
+		 * No restrictions so for a user client we can clear
+		 * the whole fifo
+		 */
+		if (client->type == USER_CLIENT)
+			snd_seq_fifo_clear(client->data.user.fifo);
+	}
+
+	if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
+		snd_seq_queue_remove_cells(client->number, &info);
+
+	return 0;
+}
+
+
+/*
+ * get subscription info
+ */
+static int snd_seq_ioctl_get_subscription(client_t *client, void __user *arg)
+{
+	int result;
+	client_t *sender = NULL;
+	client_port_t *sport = NULL;
+	snd_seq_port_subscribe_t subs;
+	subscribers_t *p;
+
+	if (copy_from_user(&subs, arg, sizeof(subs)))
+		return -EFAULT;
+
+	result = -EINVAL;
+	if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
+		goto __end;
+	if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
+		goto __end;
+	p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
+	if (p) {
+		result = 0;
+		subs = p->info;
+	} else
+		result = -ENOENT;
+
+      __end:
+      	if (sport)
+		snd_seq_port_unlock(sport);
+	if (sender)
+		snd_seq_client_unlock(sender);
+	if (result >= 0) {
+		if (copy_to_user(arg, &subs, sizeof(subs)))
+			return -EFAULT;
+	}
+	return result;
+}
+
+
+/*
+ * get subscription info - check only its presence
+ */
+static int snd_seq_ioctl_query_subs(client_t *client, void __user *arg)
+{
+	int result = -ENXIO;
+	client_t *cptr = NULL;
+	client_port_t *port = NULL;
+	snd_seq_query_subs_t subs;
+	port_subs_info_t *group;
+	struct list_head *p;
+	int i;
+
+	if (copy_from_user(&subs, arg, sizeof(subs)))
+		return -EFAULT;
+
+	if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
+		goto __end;
+	if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
+		goto __end;
+
+	switch (subs.type) {
+	case SNDRV_SEQ_QUERY_SUBS_READ:
+		group = &port->c_src;
+		break;
+	case SNDRV_SEQ_QUERY_SUBS_WRITE:
+		group = &port->c_dest;
+		break;
+	default:
+		goto __end;
+	}
+
+	down_read(&group->list_mutex);
+	/* search for the subscriber */
+	subs.num_subs = group->count;
+	i = 0;
+	result = -ENOENT;
+	list_for_each(p, &group->list_head) {
+		if (i++ == subs.index) {
+			/* found! */
+			subscribers_t *s;
+			if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
+				s = list_entry(p, subscribers_t, src_list);
+				subs.addr = s->info.dest;
+			} else {
+				s = list_entry(p, subscribers_t, dest_list);
+				subs.addr = s->info.sender;
+			}
+			subs.flags = s->info.flags;
+			subs.queue = s->info.queue;
+			result = 0;
+			break;
+		}
+	}
+	up_read(&group->list_mutex);
+
+      __end:
+   	if (port)
+		snd_seq_port_unlock(port);
+	if (cptr)
+		snd_seq_client_unlock(cptr);
+	if (result >= 0) {
+		if (copy_to_user(arg, &subs, sizeof(subs)))
+			return -EFAULT;
+	}
+	return result;
+}
+
+
+/*
+ * query next client
+ */
+static int snd_seq_ioctl_query_next_client(client_t *client, void __user *arg)
+{
+	client_t *cptr = NULL;
+	snd_seq_client_info_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	/* search for next client */
+	info.client++;
+	if (info.client < 0)
+		info.client = 0;
+	for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
+		cptr = snd_seq_client_use_ptr(info.client);
+		if (cptr)
+			break; /* found */
+	}
+	if (cptr == NULL)
+		return -ENOENT;
+
+	get_client_info(cptr, &info);
+	snd_seq_client_unlock(cptr);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+/* 
+ * query next port
+ */
+static int snd_seq_ioctl_query_next_port(client_t *client, void __user *arg)
+{
+	client_t *cptr;
+	client_port_t *port = NULL;
+	snd_seq_port_info_t info;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+	cptr = snd_seq_client_use_ptr(info.addr.client);
+	if (cptr == NULL)
+		return -ENXIO;
+
+	/* search for next port */
+	info.addr.port++;
+	port = snd_seq_port_query_nearest(cptr, &info);
+	if (port == NULL) {
+		snd_seq_client_unlock(cptr);
+		return -ENOENT;
+	}
+
+	/* get port info */
+	info.addr = port->addr;
+	snd_seq_get_port_info(port, &info);
+	snd_seq_port_unlock(port);
+	snd_seq_client_unlock(cptr);
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+/* -------------------------------------------------------- */
+
+static struct seq_ioctl_table {
+	unsigned int cmd;
+	int (*func)(client_t *client, void __user * arg);
+} ioctl_tables[] = {
+	{ SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
+	{ SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
+	{ SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
+	{ SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
+	{ SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
+	{ SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
+	{ SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
+	{ SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
+	{ SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
+	{ SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
+	{ SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
+	{ SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
+	{ SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
+	{ SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
+	{ SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
+	{ SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
+	{ SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
+	{ SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
+	{ SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
+	{ SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
+	{ SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
+	{ SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
+	{ SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
+	{ SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
+	{ SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
+	{ SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
+	{ SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
+	{ SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
+	{ SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
+	{ 0, NULL },
+};
+
+static int snd_seq_do_ioctl(client_t *client, unsigned int cmd, void __user *arg)
+{
+	struct seq_ioctl_table *p;
+
+	switch (cmd) {
+	case SNDRV_SEQ_IOCTL_PVERSION:
+		/* return sequencer version number */
+		return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
+	case SNDRV_SEQ_IOCTL_CLIENT_ID:
+		/* return the id of this client */
+		return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
+	}
+
+	if (! arg)
+		return -EFAULT;
+	for (p = ioctl_tables; p->cmd; p++) {
+		if (p->cmd == cmd)
+			return p->func(client, arg);
+	}
+	snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
+		   cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
+	return -ENOTTY;
+}
+
+
+static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	client_t *client = (client_t *) file->private_data;
+
+	snd_assert(client != NULL, return -ENXIO);
+		
+	return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
+}
+
+#ifdef CONFIG_COMPAT
+#include "seq_compat.c"
+#else
+#define snd_seq_ioctl_compat	NULL
+#endif
+
+/* -------------------------------------------------------- */
+
+
+/* exported to kernel modules */
+int snd_seq_create_kernel_client(snd_card_t *card, int client_index, snd_seq_client_callback_t * callback)
+{
+	client_t *client;
+
+	snd_assert(! in_interrupt(), return -EBUSY);
+
+	if (callback == NULL)
+		return -EINVAL;
+	if (card && client_index > 7)
+		return -EINVAL;
+	if (card == NULL && client_index > 63)
+		return -EINVAL;
+	if (card)
+		client_index += 64 + (card->number << 3);
+
+	if (down_interruptible(&register_mutex))
+		return -ERESTARTSYS;
+	/* empty write queue as default */
+	client = seq_create_client1(client_index, 0);
+	if (client == NULL) {
+		up(&register_mutex);
+		return -EBUSY;	/* failure code */
+	}
+	usage_alloc(&client_usage, 1);
+
+	client->accept_input = callback->allow_output;
+	client->accept_output = callback->allow_input;
+		
+	/* fill client data */
+	client->data.kernel.card = card;
+	client->data.kernel.private_data = callback->private_data;
+	sprintf(client->name, "Client-%d", client->number);
+
+	client->type = KERNEL_CLIENT;
+	up(&register_mutex);
+
+	/* make others aware this new client */
+	snd_seq_system_client_ev_client_start(client->number);
+	
+	/* return client number to caller */
+	return client->number;
+}
+
+/* exported to kernel modules */
+int snd_seq_delete_kernel_client(int client)
+{
+	client_t *ptr;
+
+	snd_assert(! in_interrupt(), return -EBUSY);
+
+	ptr = clientptr(client);
+	if (ptr == NULL)
+		return -EINVAL;
+
+	seq_free_client(ptr);
+	kfree(ptr);
+	return 0;
+}
+
+
+/* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
+ * and snd_seq_kernel_client_enqueue_blocking
+ */
+static int kernel_client_enqueue(int client, snd_seq_event_t *ev,
+				 struct file *file, int blocking,
+				 int atomic, int hop)
+{
+	client_t *cptr;
+	int result;
+
+	snd_assert(ev != NULL, return -EINVAL);
+
+	if (ev->type == SNDRV_SEQ_EVENT_NONE)
+		return 0; /* ignore this */
+	if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
+		return -EINVAL; /* quoted events can't be enqueued */
+
+	/* fill in client number */
+	ev->source.client = client;
+
+	if (check_event_type_and_length(ev))
+		return -EINVAL;
+
+	cptr = snd_seq_client_use_ptr(client);
+	if (cptr == NULL)
+		return -EINVAL;
+	
+	if (! cptr->accept_output)
+		result = -EPERM;
+	else /* send it */
+		result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
+
+	snd_seq_client_unlock(cptr);
+	return result;
+}
+
+/*
+ * exported, called by kernel clients to enqueue events (w/o blocking)
+ *
+ * RETURN VALUE: zero if succeed, negative if error
+ */
+int snd_seq_kernel_client_enqueue(int client, snd_seq_event_t * ev,
+				  int atomic, int hop)
+{
+	return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
+}
+
+/*
+ * exported, called by kernel clients to enqueue events (with blocking)
+ *
+ * RETURN VALUE: zero if succeed, negative if error
+ */
+int snd_seq_kernel_client_enqueue_blocking(int client, snd_seq_event_t * ev,
+					   struct file *file,
+					   int atomic, int hop)
+{
+	return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
+}
+
+
+/* 
+ * exported, called by kernel clients to dispatch events directly to other
+ * clients, bypassing the queues.  Event time-stamp will be updated.
+ *
+ * RETURN VALUE: negative = delivery failed,
+ *		 zero, or positive: the number of delivered events
+ */
+int snd_seq_kernel_client_dispatch(int client, snd_seq_event_t * ev,
+				   int atomic, int hop)
+{
+	client_t *cptr;
+	int result;
+
+	snd_assert(ev != NULL, return -EINVAL);
+
+	/* fill in client number */
+	ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
+	ev->source.client = client;
+
+	if (check_event_type_and_length(ev))
+		return -EINVAL;
+
+	cptr = snd_seq_client_use_ptr(client);
+	if (cptr == NULL)
+		return -EINVAL;
+
+	if (!cptr->accept_output)
+		result = -EPERM;
+	else
+		result = snd_seq_deliver_event(cptr, ev, atomic, hop);
+
+	snd_seq_client_unlock(cptr);
+	return result;
+}
+
+
+/*
+ * exported, called by kernel clients to perform same functions as with
+ * userland ioctl() 
+ */
+int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
+{
+	client_t *client;
+	mm_segment_t fs;
+	int result;
+
+	client = clientptr(clientid);
+	if (client == NULL)
+		return -ENXIO;
+	fs = snd_enter_user();
+	result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
+	snd_leave_user(fs);
+	return result;
+}
+
+
+/* exported (for OSS emulator) */
+int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
+{
+	client_t *client;
+
+	client = clientptr(clientid);
+	if (client == NULL)
+		return -ENXIO;
+
+	if (! snd_seq_write_pool_allocated(client))
+		return 1;
+	if (snd_seq_pool_poll_wait(client->pool, file, wait))
+		return 1;
+	return 0;
+}
+
+/*---------------------------------------------------------------------------*/
+
+/*
+ *  /proc interface
+ */
+static void snd_seq_info_dump_subscribers(snd_info_buffer_t *buffer, port_subs_info_t *group, int is_src, char *msg)
+{
+	struct list_head *p;
+	subscribers_t *s;
+	int count = 0;
+
+	down_read(&group->list_mutex);
+	if (list_empty(&group->list_head)) {
+		up_read(&group->list_mutex);
+		return;
+	}
+	snd_iprintf(buffer, msg);
+	list_for_each(p, &group->list_head) {
+		if (is_src)
+			s = list_entry(p, subscribers_t, src_list);
+		else
+			s = list_entry(p, subscribers_t, dest_list);
+		if (count++)
+			snd_iprintf(buffer, ", ");
+		snd_iprintf(buffer, "%d:%d",
+			    is_src ? s->info.dest.client : s->info.sender.client,
+			    is_src ? s->info.dest.port : s->info.sender.port);
+		if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
+			snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
+		if (group->exclusive)
+			snd_iprintf(buffer, "[ex]");
+	}
+	up_read(&group->list_mutex);
+	snd_iprintf(buffer, "\n");
+}
+
+#define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
+#define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
+#define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
+
+#define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
+
+static void snd_seq_info_dump_ports(snd_info_buffer_t *buffer, client_t *client)
+{
+	struct list_head *l;
+
+	down(&client->ports_mutex);
+	list_for_each(l, &client->ports_list_head) {
+		client_port_t *p = list_entry(l, client_port_t, list);
+		snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
+			    p->addr.port, p->name,
+			    FLAG_PERM_RD(p->capability),
+			    FLAG_PERM_WR(p->capability),
+			    FLAG_PERM_EX(p->capability),
+			    FLAG_PERM_DUPLEX(p->capability));
+		snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
+		snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
+	}
+	up(&client->ports_mutex);
+}
+
+
+/* exported to seq_info.c */
+void snd_seq_info_clients_read(snd_info_entry_t *entry, 
+			       snd_info_buffer_t * buffer)
+{
+	extern void snd_seq_info_pool(snd_info_buffer_t * buffer, pool_t * pool, char *space);
+	int c;
+	client_t *client;
+
+	snd_iprintf(buffer, "Client info\n");
+	snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
+	snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
+	snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
+	snd_iprintf(buffer, "\n");
+
+	/* list the client table */
+	for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
+		client = snd_seq_client_use_ptr(c);
+		if (client == NULL)
+			continue;
+		if (client->type == NO_CLIENT) {
+			snd_seq_client_unlock(client);
+			continue;
+		}
+
+		snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
+			    c, client->name,
+			    client->type == USER_CLIENT ? "User" : "Kernel");
+		snd_seq_info_dump_ports(buffer, client);
+		if (snd_seq_write_pool_allocated(client)) {
+			snd_iprintf(buffer, "  Output pool :\n");
+			snd_seq_info_pool(buffer, client->pool, "    ");
+		}
+		if (client->type == USER_CLIENT && client->data.user.fifo &&
+		    client->data.user.fifo->pool) {
+			snd_iprintf(buffer, "  Input pool :\n");
+			snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
+		}
+		snd_seq_client_unlock(client);
+	}
+}
+
+
+/*---------------------------------------------------------------------------*/
+
+
+/*
+ *  REGISTRATION PART
+ */
+
+static struct file_operations snd_seq_f_ops =
+{
+	.owner =	THIS_MODULE,
+	.read =		snd_seq_read,
+	.write =	snd_seq_write,
+	.open =		snd_seq_open,
+	.release =	snd_seq_release,
+	.poll =		snd_seq_poll,
+	.unlocked_ioctl =	snd_seq_ioctl,
+	.compat_ioctl =	snd_seq_ioctl_compat,
+};
+
+static snd_minor_t snd_seq_reg =
+{
+	.comment =	"sequencer",
+	.f_ops =	&snd_seq_f_ops,
+};
+
+
+/* 
+ * register sequencer device 
+ */
+int __init snd_sequencer_device_init(void)
+{
+	int err;
+
+	if (down_interruptible(&register_mutex))
+		return -ERESTARTSYS;
+
+	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, &snd_seq_reg, "seq")) < 0) {
+		up(&register_mutex);
+		return err;
+	}
+	
+	up(&register_mutex);
+
+	return 0;
+}
+
+
+
+/* 
+ * unregister sequencer device 
+ */
+void __exit snd_sequencer_device_done(void)
+{
+	snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
+}