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-rw-r--r--sound/core/seq/seq_clientmgr.c2503
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 00000000000..d8f76afd284
--- /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);
+}