diff options
Diffstat (limited to 'sound/core/seq/seq_clientmgr.c')
| -rw-r--r-- | sound/core/seq/seq_clientmgr.c | 2540 |
1 files changed, 2540 insertions, 0 deletions
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c new file mode 100644 index 000000000..aaf9c419c --- /dev/null +++ b/sound/core/seq/seq_clientmgr.c @@ -0,0 +1,2540 @@ +/* + * ALSA sequencer Client Manager + * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> + * Jaroslav Kysela <perex@perex.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 <linux/init.h> +#include <linux/export.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 + * + */ + +/* + * There are four ranges of client numbers (last two shared): + * 0..15: global clients + * 16..127: statically allocated client numbers for cards 0..27 + * 128..191: dynamically allocated client numbers for cards 28..31 + * 128..191: dynamically allocated client numbers for applications + */ + +/* number of kernel non-card clients */ +#define SNDRV_SEQ_GLOBAL_CLIENTS 16 +/* clients per cards, for static clients */ +#define SNDRV_SEQ_CLIENTS_PER_CARD 4 +/* dynamically allocated client numbers (both kernel drivers and user space) */ +#define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 + +#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 DEFINE_MUTEX(register_mutex); + +/* + * client table + */ +static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; +static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; +static struct snd_seq_usage client_usage; + +/* + * prototypes + */ +static int bounce_error_event(struct snd_seq_client *client, + struct snd_seq_event *event, + int err, int atomic, int hop); +static int snd_seq_deliver_single_event(struct snd_seq_client *client, + struct snd_seq_event *event, + int filter, int atomic, int hop); + +/* + */ +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(struct snd_seq_client *client) +{ + return snd_seq_total_cells(client->pool) > 0; +} + +/* return pointer to client structure for specified id */ +static struct snd_seq_client *clientptr(int clientid) +{ + if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { + pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", + clientid); + return NULL; + } + return clienttab[clientid]; +} + +struct snd_seq_client *snd_seq_client_use_ptr(int clientid) +{ + unsigned long flags; + struct snd_seq_client *client; + + if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { + pr_debug("ALSA: 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_MODULES + if (!in_interrupt()) { + static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS]; + static char card_requested[SNDRV_CARDS]; + if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { + int idx; + + if (!client_requested[clientid]) { + client_requested[clientid] = 1; + for (idx = 0; idx < 15; 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 < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { + int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / + SNDRV_SEQ_CLIENTS_PER_CARD; + 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(struct snd_seq_usage *res, int num) +{ + res->cur += num; + if (res->cur > res->peak) + res->peak = res->cur; +} + +static void usage_free(struct snd_seq_usage *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 struct snd_seq_client *seq_create_client1(int client_index, int poolsize) +{ + unsigned long flags; + int c; + struct snd_seq_client *client; + + /* init client data */ + client = kzalloc(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); + mutex_init(&client->ports_mutex); + INIT_LIST_HEAD(&client->ports_list_head); + mutex_init(&client->ioctl_mutex); + + /* find free slot in the client table */ + spin_lock_irqsave(&clients_lock, flags); + if (client_index < 0) { + for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; + 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(struct snd_seq_client *client) +{ + unsigned long flags; + + if (!client) + return 0; + spin_lock_irqsave(&clients_lock, flags); + clienttablock[client->number] = 1; + clienttab[client->number] = NULL; + spin_unlock_irqrestore(&clients_lock, flags); + snd_seq_delete_all_ports(client); + snd_seq_queue_client_leave(client->number); + 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(struct snd_seq_client * client) +{ + mutex_lock(®ister_mutex); + switch (client->type) { + case NO_CLIENT: + pr_warn("ALSA: 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: + pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", + client->number, client->type); + } + mutex_unlock(®ister_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 */ + struct snd_seq_client *client; + struct snd_seq_user_client *user; + int err; + + err = nonseekable_open(inode, file); + if (err < 0) + return err; + + mutex_lock(®ister_mutex); + client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); + if (!client) { + mutex_unlock(®ister_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); + mutex_unlock(®ister_mutex); + return -ENOMEM; + } + } + + usage_alloc(&client_usage, 1); + client->type = USER_CLIENT; + mutex_unlock(®ister_mutex); + + c = client->number; + file->private_data = client; + + /* fill client data */ + user->file = file; + sprintf(client->name, "Client-%d", c); + client->data.user.owner = get_pid(task_pid(current)); + + /* 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) +{ + struct snd_seq_client *client = file->private_data; + + if (client) { + seq_free_client(client); + if (client->data.user.fifo) + snd_seq_fifo_delete(&client->data.user.fifo); + put_pid(client->data.user.owner); + 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) +{ + struct snd_seq_client *client = file->private_data; + struct snd_seq_fifo *fifo; + int err; + long result = 0; + struct snd_seq_event_cell *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 */ + if (snd_BUG_ON(!client)) + 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(struct snd_seq_event)) { + 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)) { + struct snd_seq_event tmpev; + tmpev = cell->event; + tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; + if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) { + err = -EFAULT; + break; + } + count -= sizeof(struct snd_seq_event); + buf += sizeof(struct snd_seq_event); + err = snd_seq_expand_var_event(&cell->event, count, + (char __force *)buf, 0, + sizeof(struct snd_seq_event)); + if (err < 0) + break; + result += err; + count -= err; + buf += err; + } else { + if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) { + err = -EFAULT; + break; + } + count -= sizeof(struct snd_seq_event); + buf += sizeof(struct snd_seq_event); + } + snd_seq_cell_free(cell); + cell = NULL; /* to be sure */ + result += sizeof(struct snd_seq_event); + } + + 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(struct snd_seq_client_port *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 struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, + int filter) +{ + struct snd_seq_client *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(struct snd_seq_client *client, + struct snd_seq_event *event, + int err, int atomic, int hop) +{ + struct snd_seq_event 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(struct snd_seq_event *event, + int queue, int real_time) +{ + struct snd_seq_queue *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, true); + 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(struct snd_seq_client *client, + struct snd_seq_event *event, + int filter, int atomic, int hop) +{ + struct snd_seq_client *dest = NULL; + struct snd_seq_client_port *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(struct snd_seq_client *client, + struct snd_seq_event *event, + int atomic, int hop) +{ + struct snd_seq_subscribers *subs; + int err, result = 0, num_ev = 0; + struct snd_seq_event event_saved; + struct snd_seq_client_port *src_port; + struct snd_seq_port_subs_info *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_nested(&grp->list_mutex, hop); + list_for_each_entry(subs, &grp->list_head, src_list) { + /* both ports ready? */ + if (atomic_read(&subs->ref_count) != 2) + continue; + 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) { + /* save first error that occurs and continue */ + if (!result) + result = err; + continue; + } + 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 (result < 0) ? result : num_ev; +} + + +#ifdef SUPPORT_BROADCAST +/* + * broadcast to all ports: + */ +static int port_broadcast_event(struct snd_seq_client *client, + struct snd_seq_event *event, + int atomic, int hop) +{ + int num_ev = 0, err, result = 0; + struct snd_seq_client *dest_client; + struct snd_seq_client_port *port; + + 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_entry(port, &dest_client->ports_list_head, 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) { + /* save first error that occurs and continue */ + if (!result) + result = err; + continue; + } + num_ev++; + } + read_unlock(&dest_client->ports_lock); + snd_seq_client_unlock(dest_client); + event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ + return (result < 0) ? result : num_ev; +} + +/* + * send the event to all clients: + * if destination port is also ADDRESS_BROADCAST, deliver to all ports. + */ +static int broadcast_event(struct snd_seq_client *client, + struct snd_seq_event *event, int atomic, int hop) +{ + int err, result = 0, num_ev = 0; + int dest; + struct snd_seq_addr 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) { + /* save first error that occurs and continue */ + if (!result) + result = err; + continue; + } + num_ev += err; + } + event->dest = addr; /* restore */ + return (result < 0) ? result : num_ev; +} + + +/* multicast - not supported yet */ +static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, + int atomic, int hop) +{ + pr_debug("ALSA: 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(struct snd_seq_client *client, struct snd_seq_event *event, + int atomic, int hop) +{ + int result; + + hop++; + if (hop >= SNDRV_SEQ_MAX_HOPS) { + pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", + event->source.client, event->source.port, + event->dest.client, event->dest.port); + return -EMLINK; + } + + if (snd_seq_ev_is_variable(event) && + snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) + return -EINVAL; + + 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(struct snd_seq_event_cell *cell, int atomic, int hop) +{ + struct snd_seq_client *client; + int result; + + if (snd_BUG_ON(!cell)) + 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. + */ + struct snd_seq_event 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(struct snd_seq_client *client, + struct snd_seq_event *event, + struct file *file, int blocking, + int atomic, int hop, + struct mutex *mutexp) +{ + struct snd_seq_event_cell *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 */ + struct snd_seq_client_port *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, mutexp); + 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(struct snd_seq_event *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_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) +{ + struct snd_seq_client *client = file->private_data; + int written = 0, len; + int err, handled; + struct snd_seq_event event; + + if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) + return -ENXIO; + + /* check client structures are in place */ + if (snd_BUG_ON(!client)) + return -ENXIO; + + if (!client->accept_output || client->pool == NULL) + return -ENXIO; + + repeat: + handled = 0; + /* allocate the pool now if the pool is not allocated yet */ + mutex_lock(&client->ioctl_mutex); + if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { + err = snd_seq_pool_init(client->pool); + if (err < 0) + goto out; + } + + /* only process whole events */ + err = -EINVAL; + while (count >= sizeof(struct snd_seq_event)) { + /* 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 __force *)buf + + sizeof(struct snd_seq_event); + len += extlen; /* increment data length */ + } else { +#ifdef CONFIG_COMPAT + if (client->convert32 && snd_seq_ev_is_varusr(&event)) { + void *ptr = (void __force *)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, &client->ioctl_mutex); + if (err < 0) + break; + handled++; + + __skip_event: + /* Update pointers and counts */ + count -= len; + buf += len; + written += len; + + /* let's have a coffee break if too many events are queued */ + if (++handled >= 200) { + mutex_unlock(&client->ioctl_mutex); + goto repeat; + } + } + + out: + mutex_unlock(&client->ioctl_mutex); + return written ? written : err; +} + + +/* + * handle polling + */ +static __poll_t snd_seq_poll(struct file *file, poll_table * wait) +{ + struct snd_seq_client *client = file->private_data; + __poll_t mask = 0; + + /* check client structures are in place */ + if (snd_BUG_ON(!client)) + return EPOLLERR; + + 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 |= EPOLLIN | EPOLLRDNORM; + } + + 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 |= EPOLLOUT | EPOLLWRNORM; + } + + return mask; +} + + +/*-----------------------------------------------------*/ + +static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) +{ + int *pversion = arg; + + *pversion = SNDRV_SEQ_VERSION; + return 0; +} + +static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) +{ + int *client_id = arg; + + *client_id = client->number; + return 0; +} + +/* SYSTEM_INFO ioctl() */ +static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_system_info *info = arg; + + memset(info, 0, sizeof(*info)); + /* fill the info fields */ + info->queues = SNDRV_SEQ_MAX_QUEUES; + info->clients = SNDRV_SEQ_MAX_CLIENTS; + info->ports = SNDRV_SEQ_MAX_PORTS; + info->channels = 256; /* fixed limit */ + info->cur_clients = client_usage.cur; + info->cur_queues = snd_seq_queue_get_cur_queues(); + + return 0; +} + + +/* RUNNING_MODE ioctl() */ +static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_running_info *info = arg; + struct snd_seq_client *cptr; + int err = 0; + + /* 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(struct snd_seq_client *cptr, + struct snd_seq_client_info *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; + + if (cptr->type == USER_CLIENT) + info->pid = pid_vnr(cptr->data.user.owner); + else + info->pid = -1; + + if (cptr->type == KERNEL_CLIENT) + info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; + else + info->card = -1; + + memset(info->reserved, 0, sizeof(info->reserved)); +} + +static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_client_info *client_info = arg; + struct snd_seq_client *cptr; + + /* 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); + + return 0; +} + + +/* CLIENT_INFO ioctl() */ +static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_client_info *client_info = arg; + + /* 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]) + strscpy(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(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_port_info *info = arg; + struct snd_seq_client_port *port; + struct snd_seq_port_callback *callback; + int port_idx; + + /* 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) { + port_idx = port->addr.port; + snd_seq_port_unlock(port); + snd_seq_delete_port(client, port_idx); + 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->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); + snd_seq_port_unlock(port); + + return 0; +} + +/* + * DELETE PORT ioctl() + */ +static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_port_info *info = arg; + int err; + + /* 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(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_port_info *info = arg; + struct snd_seq_client *cptr; + struct snd_seq_client_port *port; + + 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); + + return 0; +} + + +/* + * SET_PORT_INFO ioctl() (only ports on this/own client) + */ +static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_port_info *info = arg; + struct snd_seq_client_port *port; + + 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(struct snd_seq_client *client, + struct snd_seq_client_port *sport, + struct snd_seq_client_port *dport, + struct snd_seq_port_subscribe *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, + struct snd_seq_port_subscribe *info, + int evtype) +{ + struct snd_seq_event 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(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_port_subscribe *subs = arg; + int result = -EINVAL; + struct snd_seq_client *receiver = NULL, *sender = NULL; + struct snd_seq_client_port *sport = NULL, *dport = NULL; + + 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(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_port_subscribe *subs = arg; + int result = -ENXIO; + struct snd_seq_client *receiver = NULL, *sender = NULL; + struct snd_seq_client_port *sport = NULL, *dport = NULL; + + 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(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_queue_info *info = arg; + struct snd_seq_queue *q; + + q = snd_seq_queue_alloc(client->number, info->locked, info->flags); + if (IS_ERR(q)) + return PTR_ERR(q); + + 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); + strscpy(q->name, info->name, sizeof(q->name)); + snd_use_lock_free(&q->use_lock); + + return 0; +} + +/* DELETE_QUEUE ioctl() */ +static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_queue_info *info = arg; + + return snd_seq_queue_delete(client->number, info->queue); +} + +/* GET_QUEUE_INFO ioctl() */ +static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_info *info = arg; + struct snd_seq_queue *q; + + 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); + + return 0; +} + +/* SET_QUEUE_INFO ioctl() */ +static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_info *info = arg; + struct snd_seq_queue *q; + + 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; + } + strscpy(q->name, info->name, sizeof(q->name)); + queuefree(q); + + return 0; +} + +/* GET_NAMED_QUEUE ioctl() */ +static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_info *info = arg; + struct snd_seq_queue *q; + + 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); + + return 0; +} + +/* GET_QUEUE_STATUS ioctl() */ +static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_status *status = arg; + struct snd_seq_queue *queue; + struct snd_seq_timer *tmr; + + 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, true); + status->tick = snd_seq_timer_get_cur_tick(tmr); + + status->running = tmr->running; + + status->flags = queue->flags; + queuefree(queue); + + return 0; +} + + +/* GET_QUEUE_TEMPO ioctl() */ +static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_tempo *tempo = arg; + struct snd_seq_queue *queue; + struct snd_seq_timer *tmr; + + 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); + + return 0; +} + + +/* SET_QUEUE_TEMPO ioctl() */ +int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) +{ + if (!snd_seq_queue_check_access(tempo->queue, client)) + return -EPERM; + return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); +} +EXPORT_SYMBOL(snd_seq_set_queue_tempo); + +static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_tempo *tempo = arg; + int result; + + 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(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_timer *timer = arg; + struct snd_seq_queue *queue; + struct snd_seq_timer *tmr; + + queue = queueptr(timer->queue); + if (queue == NULL) + return -EINVAL; + + mutex_lock(&queue->timer_mutex); + 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; + } + mutex_unlock(&queue->timer_mutex); + queuefree(queue); + + return 0; +} + + +/* SET_QUEUE_TIMER ioctl() */ +static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_timer *timer = arg; + int result = 0; + + if (timer->type != SNDRV_SEQ_TIMER_ALSA) + return -EINVAL; + + if (snd_seq_queue_check_access(timer->queue, client->number)) { + struct snd_seq_queue *q; + struct snd_seq_timer *tmr; + + q = queueptr(timer->queue); + if (q == NULL) + return -ENXIO; + mutex_lock(&q->timer_mutex); + 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); + mutex_unlock(&q->timer_mutex); + queuefree(q); + } else { + return -EPERM; + } + + return result; +} + + +/* GET_QUEUE_CLIENT ioctl() */ +static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_client *info = arg; + int used; + + used = snd_seq_queue_is_used(info->queue, client->number); + if (used < 0) + return -EINVAL; + info->used = used; + info->client = client->number; + + return 0; +} + + +/* SET_QUEUE_CLIENT ioctl() */ +static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_queue_client *info = arg; + int err; + + 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(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_client_pool *info = arg; + struct snd_seq_client *cptr; + + cptr = snd_seq_client_use_ptr(info->client); + if (cptr == NULL) + return -ENOENT; + memset(info, 0, sizeof(*info)); + info->client = cptr->number; + info->output_pool = cptr->pool->size; + info->output_room = cptr->pool->room; + info->output_free = info->output_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; + info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo); + } else { + info->input_pool = 0; + info->input_free = 0; + } + snd_seq_client_unlock(cptr); + + return 0; +} + +/* SET_CLIENT_POOL ioctl() */ +static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_client_pool *info = arg; + int rc; + + 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)) { + /* is the pool in use? */ + if (atomic_read(&client->pool->counter)) + return -EBUSY; + /* remove all existing cells */ + snd_seq_pool_mark_closing(client->pool); + 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(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_remove_events *info = arg; + + /* + * 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 && client->data.user.fifo) + 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(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_port_subscribe *subs = arg; + int result; + struct snd_seq_client *sender = NULL; + struct snd_seq_client_port *sport = NULL; + + 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; + result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest, + subs); + __end: + if (sport) + snd_seq_port_unlock(sport); + if (sender) + snd_seq_client_unlock(sender); + + return result; +} + + +/* + * get subscription info - check only its presence + */ +static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) +{ + struct snd_seq_query_subs *subs = arg; + int result = -ENXIO; + struct snd_seq_client *cptr = NULL; + struct snd_seq_client_port *port = NULL; + struct snd_seq_port_subs_info *group; + struct list_head *p; + int i; + + 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! */ + struct snd_seq_subscribers *s; + if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { + s = list_entry(p, struct snd_seq_subscribers, src_list); + subs->addr = s->info.dest; + } else { + s = list_entry(p, struct snd_seq_subscribers, 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); + + return result; +} + + +/* + * query next client + */ +static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_client_info *info = arg; + struct snd_seq_client *cptr = NULL; + + /* search for next client */ + if (info->client < INT_MAX) + 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); + + return 0; +} + +/* + * query next port + */ +static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, + void *arg) +{ + struct snd_seq_port_info *info = arg; + struct snd_seq_client *cptr; + struct snd_seq_client_port *port = NULL; + + 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); + + return 0; +} + +/* -------------------------------------------------------- */ + +static const struct ioctl_handler { + unsigned int cmd; + int (*func)(struct snd_seq_client *client, void *arg); +} ioctl_handlers[] = { + { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, + { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, + { 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 long snd_seq_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct snd_seq_client *client = file->private_data; + /* To use kernel stack for ioctl data. */ + union { + int pversion; + int client_id; + struct snd_seq_system_info system_info; + struct snd_seq_running_info running_info; + struct snd_seq_client_info client_info; + struct snd_seq_port_info port_info; + struct snd_seq_port_subscribe port_subscribe; + struct snd_seq_queue_info queue_info; + struct snd_seq_queue_status queue_status; + struct snd_seq_queue_tempo tempo; + struct snd_seq_queue_timer queue_timer; + struct snd_seq_queue_client queue_client; + struct snd_seq_client_pool client_pool; + struct snd_seq_remove_events remove_events; + struct snd_seq_query_subs query_subs; + } buf; + const struct ioctl_handler *handler; + unsigned long size; + int err; + + if (snd_BUG_ON(!client)) + return -ENXIO; + + for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { + if (handler->cmd == cmd) + break; + } + if (handler->cmd == 0) + return -ENOTTY; + + memset(&buf, 0, sizeof(buf)); + + /* + * All of ioctl commands for ALSA sequencer get an argument of size + * within 13 bits. We can safely pick up the size from the command. + */ + size = _IOC_SIZE(handler->cmd); + if (handler->cmd & IOC_IN) { + if (copy_from_user(&buf, (const void __user *)arg, size)) + return -EFAULT; + } + + mutex_lock(&client->ioctl_mutex); + err = handler->func(client, &buf); + mutex_unlock(&client->ioctl_mutex); + if (err >= 0) { + /* Some commands includes a bug in 'dir' field. */ + if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || + handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || + (handler->cmd & IOC_OUT)) + if (copy_to_user((void __user *)arg, &buf, size)) + return -EFAULT; + } + + return err; +} + +#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(struct snd_card *card, int client_index, + const char *name_fmt, ...) +{ + struct snd_seq_client *client; + va_list args; + + if (snd_BUG_ON(in_interrupt())) + return -EBUSY; + + if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) + return -EINVAL; + if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) + return -EINVAL; + + mutex_lock(®ister_mutex); + + if (card) { + client_index += SNDRV_SEQ_GLOBAL_CLIENTS + + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; + if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) + client_index = -1; + } + + /* empty write queue as default */ + client = seq_create_client1(client_index, 0); + if (client == NULL) { + mutex_unlock(®ister_mutex); + return -EBUSY; /* failure code */ + } + usage_alloc(&client_usage, 1); + + client->accept_input = 1; + client->accept_output = 1; + client->data.kernel.card = card; + + va_start(args, name_fmt); + vsnprintf(client->name, sizeof(client->name), name_fmt, args); + va_end(args); + + client->type = KERNEL_CLIENT; + mutex_unlock(®ister_mutex); + + /* make others aware this new client */ + snd_seq_system_client_ev_client_start(client->number); + + /* return client number to caller */ + return client->number; +} +EXPORT_SYMBOL(snd_seq_create_kernel_client); + +/* exported to kernel modules */ +int snd_seq_delete_kernel_client(int client) +{ + struct snd_seq_client *ptr; + + if (snd_BUG_ON(in_interrupt())) + return -EBUSY; + + ptr = clientptr(client); + if (ptr == NULL) + return -EINVAL; + + seq_free_client(ptr); + kfree(ptr); + return 0; +} +EXPORT_SYMBOL(snd_seq_delete_kernel_client); + +/* 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, struct snd_seq_event *ev, + struct file *file, int blocking, + int atomic, int hop) +{ + struct snd_seq_client *cptr; + int result; + + if (snd_BUG_ON(!ev)) + 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, NULL); + + 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, struct snd_seq_event * ev, + int atomic, int hop) +{ + return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); +} +EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); + +/* + * 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, struct snd_seq_event * ev, + struct file *file, + int atomic, int hop) +{ + return kernel_client_enqueue(client, ev, file, 1, atomic, hop); +} +EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); + +/* + * 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, struct snd_seq_event * ev, + int atomic, int hop) +{ + struct snd_seq_client *cptr; + int result; + + if (snd_BUG_ON(!ev)) + 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; +} +EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); + +/** + * snd_seq_kernel_client_ctl - operate a command for a client with data in + * kernel space. + * @clientid: A numerical ID for a client. + * @cmd: An ioctl(2) command for ALSA sequencer operation. + * @arg: A pointer to data in kernel space. + * + * Against its name, both kernel/application client can be handled by this + * kernel API. A pointer of 'arg' argument should be in kernel space. + * + * Return: 0 at success. Negative error code at failure. + */ +int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) +{ + const struct ioctl_handler *handler; + struct snd_seq_client *client; + + client = clientptr(clientid); + if (client == NULL) + return -ENXIO; + + for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { + if (handler->cmd == cmd) + return handler->func(client, arg); + } + + pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", + cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); + return -ENOTTY; +} +EXPORT_SYMBOL(snd_seq_kernel_client_ctl); + +/* exported (for OSS emulator) */ +int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) +{ + struct snd_seq_client *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; +} +EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); + +/*---------------------------------------------------------------------------*/ + +#ifdef CONFIG_SND_PROC_FS +/* + * /proc interface + */ +static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, + struct snd_seq_port_subs_info *group, + int is_src, char *msg) +{ + struct list_head *p; + struct snd_seq_subscribers *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, struct snd_seq_subscribers, src_list); + else + s = list_entry(p, struct snd_seq_subscribers, 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(struct snd_info_buffer *buffer, + struct snd_seq_client *client) +{ + struct snd_seq_client_port *p; + + mutex_lock(&client->ports_mutex); + list_for_each_entry(p, &client->ports_list_head, 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: "); + } + mutex_unlock(&client->ports_mutex); +} + + +/* exported to seq_info.c */ +void snd_seq_info_clients_read(struct snd_info_entry *entry, + struct snd_info_buffer *buffer) +{ + int c; + struct snd_seq_client *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); + } +} +#endif /* CONFIG_SND_PROC_FS */ + +/*---------------------------------------------------------------------------*/ + + +/* + * REGISTRATION PART + */ + +static const 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, + .llseek = no_llseek, + .poll = snd_seq_poll, + .unlocked_ioctl = snd_seq_ioctl, + .compat_ioctl = snd_seq_ioctl_compat, +}; + +static struct device seq_dev; + +/* + * register sequencer device + */ +int __init snd_sequencer_device_init(void) +{ + int err; + + snd_device_initialize(&seq_dev, NULL); + dev_set_name(&seq_dev, "seq"); + + mutex_lock(®ister_mutex); + err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, + &snd_seq_f_ops, NULL, &seq_dev); + mutex_unlock(®ister_mutex); + if (err < 0) { + put_device(&seq_dev); + return err; + } + + return 0; +} + + + +/* + * unregister sequencer device + */ +void snd_sequencer_device_done(void) +{ + snd_unregister_device(&seq_dev); + put_device(&seq_dev); +} |