/*
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* OSS compatible sequencer driver
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*
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* MIDI device handlers
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*
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* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <sound/asoundef.h>
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#include "seq_oss_midi.h"
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#include "seq_oss_readq.h"
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#include "seq_oss_timer.h"
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#include "seq_oss_event.h"
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#include <sound/seq_midi_event.h>
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#include "../seq_lock.h"
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/nospec.h>
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/*
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* constants
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*/
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#define SNDRV_SEQ_OSS_MAX_MIDI_NAME 30
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/*
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* definition of midi device record
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*/
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struct seq_oss_midi {
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int seq_device; /* device number */
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int client; /* sequencer client number */
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int port; /* sequencer port number */
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unsigned int flags; /* port capability */
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int opened; /* flag for opening */
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unsigned char name[SNDRV_SEQ_OSS_MAX_MIDI_NAME];
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struct snd_midi_event *coder; /* MIDI event coder */
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struct seq_oss_devinfo *devinfo; /* assigned OSSseq device */
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snd_use_lock_t use_lock;
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};
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/*
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* midi device table
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*/
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static int max_midi_devs;
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static struct seq_oss_midi *midi_devs[SNDRV_SEQ_OSS_MAX_MIDI_DEVS];
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static DEFINE_SPINLOCK(register_lock);
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/*
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* prototypes
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*/
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static struct seq_oss_midi *get_mdev(int dev);
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static struct seq_oss_midi *get_mididev(struct seq_oss_devinfo *dp, int dev);
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static int send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev);
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static int send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev);
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/*
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* look up the existing ports
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* this looks a very exhausting job.
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*/
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int
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snd_seq_oss_midi_lookup_ports(int client)
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{
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struct snd_seq_client_info *clinfo;
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struct snd_seq_port_info *pinfo;
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clinfo = kzalloc(sizeof(*clinfo), GFP_KERNEL);
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pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
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if (! clinfo || ! pinfo) {
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kfree(clinfo);
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kfree(pinfo);
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return -ENOMEM;
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}
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clinfo->client = -1;
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while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, clinfo) == 0) {
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if (clinfo->client == client)
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continue; /* ignore myself */
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pinfo->addr.client = clinfo->client;
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pinfo->addr.port = -1;
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while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, pinfo) == 0)
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snd_seq_oss_midi_check_new_port(pinfo);
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}
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kfree(clinfo);
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kfree(pinfo);
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return 0;
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}
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/*
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*/
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static struct seq_oss_midi *
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get_mdev(int dev)
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{
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struct seq_oss_midi *mdev;
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unsigned long flags;
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spin_lock_irqsave(®ister_lock, flags);
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mdev = midi_devs[dev];
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if (mdev)
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snd_use_lock_use(&mdev->use_lock);
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spin_unlock_irqrestore(®ister_lock, flags);
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return mdev;
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}
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/*
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* look for the identical slot
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*/
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static struct seq_oss_midi *
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find_slot(int client, int port)
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{
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int i;
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struct seq_oss_midi *mdev;
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unsigned long flags;
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spin_lock_irqsave(®ister_lock, flags);
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for (i = 0; i < max_midi_devs; i++) {
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mdev = midi_devs[i];
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if (mdev && mdev->client == client && mdev->port == port) {
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/* found! */
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snd_use_lock_use(&mdev->use_lock);
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spin_unlock_irqrestore(®ister_lock, flags);
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return mdev;
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}
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}
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spin_unlock_irqrestore(®ister_lock, flags);
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return NULL;
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}
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#define PERM_WRITE (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
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#define PERM_READ (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
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/*
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* register a new port if it doesn't exist yet
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*/
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int
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snd_seq_oss_midi_check_new_port(struct snd_seq_port_info *pinfo)
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{
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int i;
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struct seq_oss_midi *mdev;
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unsigned long flags;
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/* the port must include generic midi */
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if (! (pinfo->type & SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC))
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return 0;
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/* either read or write subscribable */
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if ((pinfo->capability & PERM_WRITE) != PERM_WRITE &&
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(pinfo->capability & PERM_READ) != PERM_READ)
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return 0;
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/*
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* look for the identical slot
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*/
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if ((mdev = find_slot(pinfo->addr.client, pinfo->addr.port)) != NULL) {
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/* already exists */
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snd_use_lock_free(&mdev->use_lock);
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return 0;
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}
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/*
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* allocate midi info record
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*/
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mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
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if (!mdev)
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return -ENOMEM;
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/* copy the port information */
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mdev->client = pinfo->addr.client;
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mdev->port = pinfo->addr.port;
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mdev->flags = pinfo->capability;
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mdev->opened = 0;
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snd_use_lock_init(&mdev->use_lock);
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/* copy and truncate the name of synth device */
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strlcpy(mdev->name, pinfo->name, sizeof(mdev->name));
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/* create MIDI coder */
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if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &mdev->coder) < 0) {
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pr_err("ALSA: seq_oss: can't malloc midi coder\n");
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kfree(mdev);
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return -ENOMEM;
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}
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/* OSS sequencer adds running status to all sequences */
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snd_midi_event_no_status(mdev->coder, 1);
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/*
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* look for en empty slot
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*/
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spin_lock_irqsave(®ister_lock, flags);
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for (i = 0; i < max_midi_devs; i++) {
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if (midi_devs[i] == NULL)
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break;
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}
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if (i >= max_midi_devs) {
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if (max_midi_devs >= SNDRV_SEQ_OSS_MAX_MIDI_DEVS) {
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spin_unlock_irqrestore(®ister_lock, flags);
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snd_midi_event_free(mdev->coder);
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kfree(mdev);
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return -ENOMEM;
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}
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max_midi_devs++;
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}
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mdev->seq_device = i;
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midi_devs[mdev->seq_device] = mdev;
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spin_unlock_irqrestore(®ister_lock, flags);
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return 0;
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}
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/*
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* release the midi device if it was registered
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*/
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int
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snd_seq_oss_midi_check_exit_port(int client, int port)
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{
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struct seq_oss_midi *mdev;
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unsigned long flags;
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int index;
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if ((mdev = find_slot(client, port)) != NULL) {
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spin_lock_irqsave(®ister_lock, flags);
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midi_devs[mdev->seq_device] = NULL;
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spin_unlock_irqrestore(®ister_lock, flags);
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snd_use_lock_free(&mdev->use_lock);
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snd_use_lock_sync(&mdev->use_lock);
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snd_midi_event_free(mdev->coder);
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kfree(mdev);
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}
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spin_lock_irqsave(®ister_lock, flags);
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for (index = max_midi_devs - 1; index >= 0; index--) {
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if (midi_devs[index])
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break;
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}
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max_midi_devs = index + 1;
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spin_unlock_irqrestore(®ister_lock, flags);
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return 0;
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}
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/*
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* release the midi device if it was registered
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*/
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void
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snd_seq_oss_midi_clear_all(void)
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{
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int i;
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struct seq_oss_midi *mdev;
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unsigned long flags;
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spin_lock_irqsave(®ister_lock, flags);
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for (i = 0; i < max_midi_devs; i++) {
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if ((mdev = midi_devs[i]) != NULL) {
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snd_midi_event_free(mdev->coder);
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kfree(mdev);
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midi_devs[i] = NULL;
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}
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}
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max_midi_devs = 0;
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spin_unlock_irqrestore(®ister_lock, flags);
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}
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/*
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* set up midi tables
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*/
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void
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snd_seq_oss_midi_setup(struct seq_oss_devinfo *dp)
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{
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dp->max_mididev = max_midi_devs;
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}
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/*
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* clean up midi tables
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*/
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void
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snd_seq_oss_midi_cleanup(struct seq_oss_devinfo *dp)
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{
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int i;
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for (i = 0; i < dp->max_mididev; i++)
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snd_seq_oss_midi_close(dp, i);
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dp->max_mididev = 0;
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}
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/*
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* open all midi devices. ignore errors.
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*/
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void
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snd_seq_oss_midi_open_all(struct seq_oss_devinfo *dp, int file_mode)
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{
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int i;
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for (i = 0; i < dp->max_mididev; i++)
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snd_seq_oss_midi_open(dp, i, file_mode);
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}
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/*
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* get the midi device information
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*/
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static struct seq_oss_midi *
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get_mididev(struct seq_oss_devinfo *dp, int dev)
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{
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if (dev < 0 || dev >= dp->max_mididev)
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return NULL;
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dev = array_index_nospec(dev, dp->max_mididev);
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return get_mdev(dev);
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}
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/*
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* open the midi device if not opened yet
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*/
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int
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snd_seq_oss_midi_open(struct seq_oss_devinfo *dp, int dev, int fmode)
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{
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int perm;
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struct seq_oss_midi *mdev;
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struct snd_seq_port_subscribe subs;
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if ((mdev = get_mididev(dp, dev)) == NULL)
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return -ENODEV;
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/* already used? */
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if (mdev->opened && mdev->devinfo != dp) {
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snd_use_lock_free(&mdev->use_lock);
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return -EBUSY;
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}
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perm = 0;
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if (is_write_mode(fmode))
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perm |= PERM_WRITE;
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if (is_read_mode(fmode))
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perm |= PERM_READ;
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perm &= mdev->flags;
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if (perm == 0) {
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snd_use_lock_free(&mdev->use_lock);
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return -ENXIO;
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}
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/* already opened? */
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if ((mdev->opened & perm) == perm) {
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snd_use_lock_free(&mdev->use_lock);
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return 0;
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}
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perm &= ~mdev->opened;
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memset(&subs, 0, sizeof(subs));
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if (perm & PERM_WRITE) {
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subs.sender = dp->addr;
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subs.dest.client = mdev->client;
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subs.dest.port = mdev->port;
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if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
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mdev->opened |= PERM_WRITE;
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}
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if (perm & PERM_READ) {
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subs.sender.client = mdev->client;
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subs.sender.port = mdev->port;
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subs.dest = dp->addr;
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subs.flags = SNDRV_SEQ_PORT_SUBS_TIMESTAMP;
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subs.queue = dp->queue; /* queue for timestamps */
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if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
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mdev->opened |= PERM_READ;
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}
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if (! mdev->opened) {
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snd_use_lock_free(&mdev->use_lock);
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return -ENXIO;
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}
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mdev->devinfo = dp;
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snd_use_lock_free(&mdev->use_lock);
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return 0;
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}
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/*
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* close the midi device if already opened
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*/
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int
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snd_seq_oss_midi_close(struct seq_oss_devinfo *dp, int dev)
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{
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struct seq_oss_midi *mdev;
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struct snd_seq_port_subscribe subs;
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if ((mdev = get_mididev(dp, dev)) == NULL)
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return -ENODEV;
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if (! mdev->opened || mdev->devinfo != dp) {
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snd_use_lock_free(&mdev->use_lock);
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return 0;
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}
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memset(&subs, 0, sizeof(subs));
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if (mdev->opened & PERM_WRITE) {
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subs.sender = dp->addr;
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subs.dest.client = mdev->client;
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subs.dest.port = mdev->port;
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snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
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}
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if (mdev->opened & PERM_READ) {
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subs.sender.client = mdev->client;
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subs.sender.port = mdev->port;
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subs.dest = dp->addr;
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snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
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}
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mdev->opened = 0;
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mdev->devinfo = NULL;
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snd_use_lock_free(&mdev->use_lock);
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return 0;
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}
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/*
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* change seq capability flags to file mode flags
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*/
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int
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snd_seq_oss_midi_filemode(struct seq_oss_devinfo *dp, int dev)
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{
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struct seq_oss_midi *mdev;
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int mode;
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if ((mdev = get_mididev(dp, dev)) == NULL)
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return 0;
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mode = 0;
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if (mdev->opened & PERM_WRITE)
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mode |= SNDRV_SEQ_OSS_FILE_WRITE;
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if (mdev->opened & PERM_READ)
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mode |= SNDRV_SEQ_OSS_FILE_READ;
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snd_use_lock_free(&mdev->use_lock);
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return mode;
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}
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/*
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* reset the midi device and close it:
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* so far, only close the device.
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*/
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void
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snd_seq_oss_midi_reset(struct seq_oss_devinfo *dp, int dev)
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{
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struct seq_oss_midi *mdev;
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if ((mdev = get_mididev(dp, dev)) == NULL)
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return;
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if (! mdev->opened) {
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snd_use_lock_free(&mdev->use_lock);
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return;
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}
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if (mdev->opened & PERM_WRITE) {
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struct snd_seq_event ev;
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int c;
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memset(&ev, 0, sizeof(ev));
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ev.dest.client = mdev->client;
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ev.dest.port = mdev->port;
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ev.queue = dp->queue;
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ev.source.port = dp->port;
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if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) {
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ev.type = SNDRV_SEQ_EVENT_SENSING;
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snd_seq_oss_dispatch(dp, &ev, 0, 0);
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}
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for (c = 0; c < 16; c++) {
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ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
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ev.data.control.channel = c;
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ev.data.control.param = MIDI_CTL_ALL_NOTES_OFF;
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snd_seq_oss_dispatch(dp, &ev, 0, 0);
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if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
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ev.data.control.param =
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MIDI_CTL_RESET_CONTROLLERS;
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snd_seq_oss_dispatch(dp, &ev, 0, 0);
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ev.type = SNDRV_SEQ_EVENT_PITCHBEND;
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ev.data.control.value = 0;
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snd_seq_oss_dispatch(dp, &ev, 0, 0);
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}
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}
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}
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// snd_seq_oss_midi_close(dp, dev);
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snd_use_lock_free(&mdev->use_lock);
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}
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|
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/*
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* get client/port of the specified MIDI device
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*/
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void
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snd_seq_oss_midi_get_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_addr *addr)
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{
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struct seq_oss_midi *mdev;
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if ((mdev = get_mididev(dp, dev)) == NULL)
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return;
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addr->client = mdev->client;
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addr->port = mdev->port;
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snd_use_lock_free(&mdev->use_lock);
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}
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|
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/*
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* input callback - this can be atomic
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*/
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int
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snd_seq_oss_midi_input(struct snd_seq_event *ev, int direct, void *private_data)
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{
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struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
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struct seq_oss_midi *mdev;
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int rc;
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if (dp->readq == NULL)
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return 0;
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if ((mdev = find_slot(ev->source.client, ev->source.port)) == NULL)
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return 0;
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if (! (mdev->opened & PERM_READ)) {
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snd_use_lock_free(&mdev->use_lock);
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return 0;
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}
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if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
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rc = send_synth_event(dp, ev, mdev->seq_device);
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else
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rc = send_midi_event(dp, ev, mdev);
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snd_use_lock_free(&mdev->use_lock);
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return rc;
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}
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/*
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* convert ALSA sequencer event to OSS synth event
|
*/
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static int
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send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev)
|
{
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union evrec ossev;
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memset(&ossev, 0, sizeof(ossev));
|
|
switch (ev->type) {
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case SNDRV_SEQ_EVENT_NOTEON:
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ossev.v.cmd = MIDI_NOTEON; break;
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case SNDRV_SEQ_EVENT_NOTEOFF:
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ossev.v.cmd = MIDI_NOTEOFF; break;
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case SNDRV_SEQ_EVENT_KEYPRESS:
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ossev.v.cmd = MIDI_KEY_PRESSURE; break;
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case SNDRV_SEQ_EVENT_CONTROLLER:
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ossev.l.cmd = MIDI_CTL_CHANGE; break;
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case SNDRV_SEQ_EVENT_PGMCHANGE:
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ossev.l.cmd = MIDI_PGM_CHANGE; break;
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case SNDRV_SEQ_EVENT_CHANPRESS:
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ossev.l.cmd = MIDI_CHN_PRESSURE; break;
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case SNDRV_SEQ_EVENT_PITCHBEND:
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ossev.l.cmd = MIDI_PITCH_BEND; break;
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default:
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return 0; /* not supported */
|
}
|
|
ossev.v.dev = dev;
|
|
switch (ev->type) {
|
case SNDRV_SEQ_EVENT_NOTEON:
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case SNDRV_SEQ_EVENT_NOTEOFF:
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case SNDRV_SEQ_EVENT_KEYPRESS:
|
ossev.v.code = EV_CHN_VOICE;
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ossev.v.note = ev->data.note.note;
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ossev.v.parm = ev->data.note.velocity;
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ossev.v.chn = ev->data.note.channel;
|
break;
|
case SNDRV_SEQ_EVENT_CONTROLLER:
|
case SNDRV_SEQ_EVENT_PGMCHANGE:
|
case SNDRV_SEQ_EVENT_CHANPRESS:
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ossev.l.code = EV_CHN_COMMON;
|
ossev.l.p1 = ev->data.control.param;
|
ossev.l.val = ev->data.control.value;
|
ossev.l.chn = ev->data.control.channel;
|
break;
|
case SNDRV_SEQ_EVENT_PITCHBEND:
|
ossev.l.code = EV_CHN_COMMON;
|
ossev.l.val = ev->data.control.value + 8192;
|
ossev.l.chn = ev->data.control.channel;
|
break;
|
}
|
|
snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
|
snd_seq_oss_readq_put_event(dp->readq, &ossev);
|
|
return 0;
|
}
|
|
/*
|
* decode event and send MIDI bytes to read queue
|
*/
|
static int
|
send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev)
|
{
|
char msg[32];
|
int len;
|
|
snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
|
if (!dp->timer->running)
|
len = snd_seq_oss_timer_start(dp->timer);
|
if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
|
snd_seq_oss_readq_sysex(dp->readq, mdev->seq_device, ev);
|
snd_midi_event_reset_decode(mdev->coder);
|
} else {
|
len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
|
if (len > 0)
|
snd_seq_oss_readq_puts(dp->readq, mdev->seq_device, msg, len);
|
}
|
|
return 0;
|
}
|
|
|
/*
|
* dump midi data
|
* return 0 : enqueued
|
* non-zero : invalid - ignored
|
*/
|
int
|
snd_seq_oss_midi_putc(struct seq_oss_devinfo *dp, int dev, unsigned char c, struct snd_seq_event *ev)
|
{
|
struct seq_oss_midi *mdev;
|
|
if ((mdev = get_mididev(dp, dev)) == NULL)
|
return -ENODEV;
|
if (snd_midi_event_encode_byte(mdev->coder, c, ev)) {
|
snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
|
snd_use_lock_free(&mdev->use_lock);
|
return 0;
|
}
|
snd_use_lock_free(&mdev->use_lock);
|
return -EINVAL;
|
}
|
|
/*
|
* create OSS compatible midi_info record
|
*/
|
int
|
snd_seq_oss_midi_make_info(struct seq_oss_devinfo *dp, int dev, struct midi_info *inf)
|
{
|
struct seq_oss_midi *mdev;
|
|
if ((mdev = get_mididev(dp, dev)) == NULL)
|
return -ENXIO;
|
inf->device = dev;
|
inf->dev_type = 0; /* FIXME: ?? */
|
inf->capabilities = 0; /* FIXME: ?? */
|
strlcpy(inf->name, mdev->name, sizeof(inf->name));
|
snd_use_lock_free(&mdev->use_lock);
|
return 0;
|
}
|
|
|
#ifdef CONFIG_SND_PROC_FS
|
/*
|
* proc interface
|
*/
|
static char *
|
capmode_str(int val)
|
{
|
val &= PERM_READ|PERM_WRITE;
|
if (val == (PERM_READ|PERM_WRITE))
|
return "read/write";
|
else if (val == PERM_READ)
|
return "read";
|
else if (val == PERM_WRITE)
|
return "write";
|
else
|
return "none";
|
}
|
|
void
|
snd_seq_oss_midi_info_read(struct snd_info_buffer *buf)
|
{
|
int i;
|
struct seq_oss_midi *mdev;
|
|
snd_iprintf(buf, "\nNumber of MIDI devices: %d\n", max_midi_devs);
|
for (i = 0; i < max_midi_devs; i++) {
|
snd_iprintf(buf, "\nmidi %d: ", i);
|
mdev = get_mdev(i);
|
if (mdev == NULL) {
|
snd_iprintf(buf, "*empty*\n");
|
continue;
|
}
|
snd_iprintf(buf, "[%s] ALSA port %d:%d\n", mdev->name,
|
mdev->client, mdev->port);
|
snd_iprintf(buf, " capability %s / opened %s\n",
|
capmode_str(mdev->flags),
|
capmode_str(mdev->opened));
|
snd_use_lock_free(&mdev->use_lock);
|
}
|
}
|
#endif /* CONFIG_SND_PROC_FS */
|
