// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ALSA sequencer Client Manager
* Copyright (c) 1998-2001 by Frank van de Pol <[email protected]>
* Jaroslav Kysela <[email protected]>
* Takashi Iwai <[email protected]>
*/
#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 <sound/ump.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 "seq_ump_convert.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 atomic, int hop);
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
static void free_ump_info(struct snd_seq_client *client);
#endif
/*
*/
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 DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS);
static DECLARE_BITMAP(card_requested, SNDRV_CARDS);
if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
int idx;
if (!test_and_set_bit(clientid, client_requested)) {
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 (!test_and_set_bit(card, card_requested))
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;
}
/* Take refcount and perform ioctl_mutex lock on the given client;
* used only for OSS sequencer
* Unlock via snd_seq_client_ioctl_unlock() below
*/
bool snd_seq_client_ioctl_lock(int clientid)
{
struct snd_seq_client *client;
client = snd_seq_client_use_ptr(clientid);
if (!client)
return false;
mutex_lock(&client->ioctl_mutex);
/* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */
return true;
}
EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock);
/* Unlock and unref the given client; for OSS sequencer use only */
void snd_seq_client_ioctl_unlock(int clientid)
{
struct snd_seq_client *client;
client = snd_seq_client_use_ptr(clientid);
if (WARN_ON(!client))
return;
mutex_unlock(&client->ioctl_mutex);
/* The doubly unrefs below are intentional; the first one releases the
* leftover from snd_seq_client_ioctl_lock() above, and the second one
* is for releasing snd_seq_client_use_ptr() in this function
*/
snd_seq_client_unlock(client);
snd_seq_client_unlock(client);
}
EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock);
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)
{
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);
client->ump_endpoint_port = -1;
/* find free slot in the client table */
spin_lock_irq(&clients_lock);
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_irq(&clients_lock);
return client;
}
} else {
if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
clienttab[client->number = client_index] = client;
spin_unlock_irq(&clients_lock);
return client;
}
}
spin_unlock_irq(&clients_lock);
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)
{
if (!client)
return 0;
spin_lock_irq(&clients_lock);
clienttablock[client->number] = 1;
clienttab[client->number] = NULL;
spin_unlock_irq(&clients_lock);
snd_seq_delete_all_ports(client);
snd_seq_queue_client_leave(client->number);
snd_use_lock_sync(&client->use_lock);
if (client->pool)
snd_seq_pool_delete(&client->pool);
spin_lock_irq(&clients_lock);
clienttablock[client->number] = 0;
spin_unlock_irq(&clients_lock);
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 = stream_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);
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
free_ump_info(client);
#endif
put_pid(client->data.user.owner);
kfree(client);
}
return 0;
}
static bool event_is_compatible(const struct snd_seq_client *client,
const struct snd_seq_event *ev)
{
if (snd_seq_ev_is_ump(ev) && !client->midi_version)
return false;
if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev))
return false;
return true;
}
/* 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;
size_t aligned_size;
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(buf, count))
return -EFAULT;
/* check client structures are in place */
if (snd_BUG_ON(!client))
return -ENXIO;
if (!client->accept_input)
return -ENXIO;
fifo = client->data.user.fifo;
if (!fifo)
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);
if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0)
aligned_size = sizeof(struct snd_seq_ump_event);
else
aligned_size = sizeof(struct snd_seq_event);
/* while data available in queue */
while (count >= aligned_size) {
int nonblock;
nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
err = snd_seq_fifo_cell_out(fifo, &cell, nonblock);
if (err < 0)
break;
if (!event_is_compatible(client, &cell->event)) {
snd_seq_cell_free(cell);
cell = NULL;
continue;
}
if (snd_seq_ev_is_variable(&cell->event)) {
struct snd_seq_ump_event tmpev;
memcpy(&tmpev, &cell->event, aligned_size);
tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
if (copy_to_user(buf, &tmpev, aligned_size)) {
err = -EFAULT;
break;
}
count -= aligned_size;
buf += aligned_size;
err = snd_seq_expand_var_event(&cell->event, count,
(char __force *)buf, 0,
aligned_size);
if (err < 0)
break;
result += err;
count -= err;
buf += err;
} else {
if (copy_to_user(buf, &cell->event, aligned_size)) {
err = -EFAULT;
break;
}
count -= aligned_size;
buf += aligned_size;
}
snd_seq_cell_free(cell);
cell = NULL; /* to be sure */
result += aligned_size;
}
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
*/
static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event)
{
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 (snd_seq_ev_is_ump(event))
return dest; /* ok - no filter checks */
if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
! test_bit(event->type, dest->event_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, 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 a single event; called from below and UMP converter */
int __snd_seq_deliver_single_event(struct snd_seq_client *dest,
struct snd_seq_client_port *dest_port,
struct snd_seq_event *event,
int atomic, int hop)
{
switch (dest->type) {
case USER_CLIENT:
if (!dest->data.user.fifo)
return 0;
return snd_seq_fifo_event_in(dest->data.user.fifo, event);
case KERNEL_CLIENT:
if (!dest_port->event_input)
return 0;
return dest_port->event_input(event,
snd_seq_ev_is_direct(event),
dest_port->private_data,
atomic, hop);
}
return 0;
}
/*
* 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 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);
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);
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) {
if (snd_seq_ev_is_ump(event)) {
result = snd_seq_deliver_from_ump(client, dest, dest_port,
event, atomic, hop);
goto __skip;
} else if (snd_seq_client_is_ump(dest)) {
result = snd_seq_deliver_to_ump(client, dest, dest_port,
event, atomic, hop);
goto __skip;
}
}
#endif /* CONFIG_SND_SEQ_UMP */
result = __snd_seq_deliver_single_event(dest, dest_port, event,
atomic, hop);
__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,
struct snd_seq_client_port *src_port,
int atomic, int hop)
{
struct snd_seq_subscribers *subs;
int err, result = 0, num_ev = 0;
union __snd_seq_event event_saved;
size_t saved_size;
struct snd_seq_port_subs_info *grp;
/* save original event record */
saved_size = snd_seq_event_packet_size(event);
memcpy(&event_saved, event, saved_size);
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, atomic, hop);
if (err < 0) {
/* save first error that occurs and continue */
if (!result)
result = err;
continue;
}
num_ev++;
/* restore original event record */
memcpy(event, &event_saved, saved_size);
}
if (atomic)
read_unlock(&grp->list_lock);
else
up_read(&grp->list_mutex);
memcpy(event, &event_saved, saved_size);
return (result < 0) ? result : num_ev;
}
static int deliver_to_subscribers(struct snd_seq_client *client,
struct snd_seq_event *event,
int atomic, int hop)
{
struct snd_seq_client_port *src_port;
int ret = 0, ret2;
src_port = snd_seq_port_use_ptr(client, event->source.port);
if (src_port) {
ret = __deliver_to_subscribers(client, event, src_port, atomic, hop);
snd_seq_port_unlock(src_port);
}
if (client->ump_endpoint_port < 0 ||
event->source.port == client->ump_endpoint_port)
return ret;
src_port = snd_seq_port_use_ptr(client, client->ump_endpoint_port);
if (!src_port)
return ret;
ret2 = __deliver_to_subscribers(client, event, src_port, atomic, hop);
snd_seq_port_unlock(src_port);
return ret2 < 0 ? ret2 : ret;
}
/* 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);
else
result = snd_seq_deliver_single_event(client, event, 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 (!snd_seq_ev_is_ump(&cell->event) &&
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:
cell->event.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 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 (!snd_seq_ev_is_ump(event) &&
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. */
err = snd_seq_enqueue_event(cell, atomic, hop);
if (err < 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;
union __snd_seq_event __event;
struct snd_seq_event *ev = &__event.legacy;
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(struct snd_seq_event);
if (copy_from_user(ev, buf, len)) {
err = -EFAULT;
break;
}
/* read in the rest bytes for UMP events */
if (snd_seq_ev_is_ump(ev)) {
if (count < sizeof(struct snd_seq_ump_event))
break;
if (copy_from_user((char *)ev + len, buf + len,
sizeof(struct snd_seq_ump_event) - len)) {
err = -EFAULT;
break;
}
len = sizeof(struct snd_seq_ump_event);
}
ev->source.client = client->number; /* fill in client number */
/* Check for extension data length */
if (check_event_type_and_length(ev)) {
err = -EINVAL;
break;
}
if (!event_is_compatible(client, ev)) {
err = -EINVAL;
break;
}
/* check for special events */
if (!snd_seq_ev_is_ump(ev)) {
if (ev->type == SNDRV_SEQ_EVENT_NONE)
goto __skip_event;
else if (snd_seq_ev_is_reserved(ev)) {
err = -EINVAL;
break;
}
}
if (snd_seq_ev_is_variable(ev)) {
int extlen = ev->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 */
ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
ev->data.ext.ptr = (char __force *)buf + len;
len += extlen; /* increment data length */
} else {
#ifdef CONFIG_COMPAT
if (client->convert32 && snd_seq_ev_is_varusr(ev))
ev->data.ext.ptr =
(void __force *)compat_ptr(ev->data.raw32.d[1]);
#endif
}
/* ok, enqueue it */
err = snd_seq_client_enqueue_event(client, ev, 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_user_pversion(struct snd_seq_client *client, void *arg)
{
client->user_pversion = *(unsigned int *)arg;
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->group_filter = cptr->group_filter;
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;
info->midi_version = cptr->midi_version;
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;
/* check validity of midi_version field */
if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3) &&
client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0)
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;
if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3))
client->midi_version = client_info->midi_version;
memcpy(client->event_filter, client_info->event_filter, 32);
client->group_filter = client_info->group_filter;
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, err;
/* it is not allowed to create the port for an another client */
if (info->addr.client != client->number)
return -EPERM;
if (client->type == USER_CLIENT && info->kernel)
return -EINVAL;
if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) &&
client->ump_endpoint_port >= 0)
return -EBUSY;
if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT)
port_idx = info->addr.port;
else
port_idx = -1;
if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN)
return -EINVAL;
err = snd_seq_create_port(client, port_idx, &port);
if (err < 0)
return err;
if (client->type == KERNEL_CLIENT) {
callback = info->kernel;
if (callback) {
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);
if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT)
client->ump_endpoint_port = port->addr.port;
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) {
if (client->ump_endpoint_port == info->addr.port)
client->ump_endpoint_port = -1;
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;
receiver = snd_seq_client_use_ptr(subs->dest.client);
if (!receiver)
goto __end;
sender = snd_seq_client_use_ptr(subs->sender.client);
if (!sender)
goto __end;
sport = snd_seq_port_use_ptr(sender, subs->sender.port);
if (!sport)
goto __end;
dport = snd_seq_port_use_ptr(receiver, subs->dest.port);
if (!dport)
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;
receiver = snd_seq_client_use_ptr(subs->dest.client);
if (!receiver)
goto __end;
sender = snd_seq_client_use_ptr(subs->sender.client);
if (!sender)
goto __end;
sport = snd_seq_port_use_ptr(sender, subs->sender.port);
if (!sport)
goto __end;
dport = snd_seq_port_use_ptr(receiver, subs->dest.port);
if (!dport)
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;
strscpy(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;
if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4))
tempo->tempo_base = tmr->tempo_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;
if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4))
tempo->tempo_base = 0;
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;
sender = snd_seq_client_use_ptr(subs->sender.client);
if (!sender)
goto __end;
sport = snd_seq_port_use_ptr(sender, subs->sender.port);
if (!sport)
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;
cptr = snd_seq_client_use_ptr(subs->root.client);
if (!cptr)
goto __end;
port = snd_seq_port_use_ptr(cptr, subs->root.port);
if (!port)
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;
}
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
#define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1)
static void free_ump_info(struct snd_seq_client *client)
{
int i;
if (!client->ump_info)
return;
for (i = 0; i < NUM_UMP_INFOS; i++)
kfree(client->ump_info[i]);
kfree(client->ump_info);
client->ump_info = NULL;
}
static void terminate_ump_info_strings(void *p, int type)
{
if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) {
struct snd_ump_endpoint_info *ep = p;
ep->name[sizeof(ep->name) - 1] = 0;
} else {
struct snd_ump_block_info *bp = p;
bp->name[sizeof(bp->name) - 1] = 0;
}
}
#ifdef CONFIG_SND_PROC_FS
static void dump_ump_info(struct snd_info_buffer *buffer,
struct snd_seq_client *client)
{
struct snd_ump_endpoint_info *ep;
struct snd_ump_block_info *bp;
int i;
if (!client->ump_info)
return;
ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT];
if (ep && *ep->name)
snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name);
for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) {
bp = client->ump_info[i + 1];
if (bp && *bp->name) {
snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n",
i, bp->name,
bp->active ? "Active" : "Inactive");
snd_iprintf(buffer, " Groups: %d-%d\n",
bp->first_group + 1,
bp->first_group + bp->num_groups);
}
}
}
#endif
/* UMP-specific ioctls -- called directly without data copy */
static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller,
unsigned int cmd,
unsigned long arg)
{
struct snd_seq_client_ump_info __user *argp =
(struct snd_seq_client_ump_info __user *)arg;
struct snd_seq_client *cptr;
int client, type, err = 0;
size_t size;
void *p;
if (get_user(client, &argp->client) || get_user(type, &argp->type))
return -EFAULT;
if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO &&
caller->number != client)
return -EPERM;
if (type < 0 || type >= NUM_UMP_INFOS)
return -EINVAL;
if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT)
size = sizeof(struct snd_ump_endpoint_info);
else
size = sizeof(struct snd_ump_block_info);
cptr = snd_seq_client_use_ptr(client);
if (!cptr)
return -ENOENT;
mutex_lock(&cptr->ioctl_mutex);
if (!cptr->midi_version) {
err = -EBADFD;
goto error;
}
if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) {
if (!cptr->ump_info)
p = NULL;
else
p = cptr->ump_info[type];
if (!p) {
err = -ENODEV;
goto error;
}
if (copy_to_user(argp->info, p, size)) {
err = -EFAULT;
goto error;
}
} else {
if (cptr->type != USER_CLIENT) {
err = -EBADFD;
goto error;
}
if (!cptr->ump_info) {
cptr->ump_info = kcalloc(NUM_UMP_INFOS,
sizeof(void *), GFP_KERNEL);
if (!cptr->ump_info) {
err = -ENOMEM;
goto error;
}
}
p = memdup_user(argp->info, size);
if (IS_ERR(p)) {
err = PTR_ERR(p);
goto error;
}
kfree(cptr->ump_info[type]);
terminate_ump_info_strings(p, type);
cptr->ump_info[type] = p;
}
error:
mutex_unlock(&cptr->ioctl_mutex);
snd_seq_client_unlock(cptr);
return err;
}
#endif
/* -------------------------------------------------------- */
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_USER_PVERSION, snd_seq_ioctl_user_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;
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
/* exception - handling large data */
switch (cmd) {
case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO:
case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO:
return snd_seq_ioctl_client_ump_info(client, cmd, arg);
}
#endif
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;
client->user_pversion = SNDRV_SEQ_VERSION;
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);
/*
* 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,
struct file *file, bool blocking)
{
struct snd_seq_client *cptr;
int result;
if (snd_BUG_ON(!ev))
return -EINVAL;
if (!snd_seq_ev_is_ump(ev)) {
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 */
mutex_lock(&cptr->ioctl_mutex);
result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
false, 0,
&cptr->ioctl_mutex);
mutex_unlock(&cptr->ioctl_mutex);
}
snd_seq_client_unlock(cptr);
return result;
}
EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
/*
* 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);
/* get a sequencer client object; for internal use from a kernel client */
struct snd_seq_client *snd_seq_kernel_client_get(int id)
{
return snd_seq_client_use_ptr(id);
}
EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get);
/* put a sequencer client object; for internal use from a kernel client */
void snd_seq_kernel_client_put(struct snd_seq_client *cptr)
{
if (cptr)
snd_seq_client_unlock(cptr);
}
EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put);
/*---------------------------------------------------------------------------*/
#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 const char *port_direction_name(unsigned char dir)
{
static const char *names[4] = {
"-", "In", "Out", "In/Out"
};
if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION)
return "Invalid";
return names[dir];
}
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) {
if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE)
continue;
snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]",
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),
port_direction_name(p->direction));
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
if (snd_seq_client_is_midi2(client) && p->is_midi1)
snd_iprintf(buffer, " [MIDI1]");
#endif
snd_iprintf(buffer, "\n");
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);
}
static const char *midi_version_string(unsigned int version)
{
switch (version) {
case SNDRV_SEQ_CLIENT_LEGACY_MIDI:
return "Legacy";
case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0:
return "UMP MIDI1";
case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0:
return "UMP MIDI2";
default:
return "Unknown";
}
}
/* 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 %s]\n",
c, client->name,
client->type == USER_CLIENT ? "User" : "Kernel",
midi_version_string(client->midi_version));
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
dump_ump_info(buffer, client);
#endif
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,
.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;
err = snd_device_alloc(&seq_dev, NULL);
if (err < 0)
return err;
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);
}
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