Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | /*
* OSS compatible sequencer driver
*
* seq_oss_writeq.c - write queue and sync
*
* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "seq_oss_writeq.h"
#include "seq_oss_event.h"
#include "seq_oss_timer.h"
#include <sound/seq_oss_legacy.h>
#include "../seq_lock.h"
#include "../seq_clientmgr.h"
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
/*
* create a write queue record
*/
struct seq_oss_writeq *
snd_seq_oss_writeq_new(struct seq_oss_devinfo *dp, int maxlen)
{
struct seq_oss_writeq *q;
struct snd_seq_client_pool pool;
if ((q = kzalloc(sizeof(*q), GFP_KERNEL)) == NULL)
return NULL;
q->dp = dp;
q->maxlen = maxlen;
spin_lock_init(&q->sync_lock);
q->sync_event_put = 0;
q->sync_time = 0;
init_waitqueue_head(&q->sync_sleep);
memset(&pool, 0, sizeof(pool));
pool.client = dp->cseq;
pool.output_pool = maxlen;
pool.output_room = maxlen / 2;
snd_seq_oss_control(dp, SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, &pool);
return q;
}
/*
* delete the write queue
*/
void
snd_seq_oss_writeq_delete(struct seq_oss_writeq *q)
{
if (q) {
snd_seq_oss_writeq_clear(q); /* to be sure */
kfree(q);
}
}
/*
* reset the write queue
*/
void
snd_seq_oss_writeq_clear(struct seq_oss_writeq *q)
{
struct snd_seq_remove_events reset;
memset(&reset, 0, sizeof(reset));
reset.remove_mode = SNDRV_SEQ_REMOVE_OUTPUT; /* remove all */
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_REMOVE_EVENTS, &reset);
/* wake up sleepers if any */
snd_seq_oss_writeq_wakeup(q, 0);
}
/*
* wait until the write buffer has enough room
*/
int
snd_seq_oss_writeq_sync(struct seq_oss_writeq *q)
{
struct seq_oss_devinfo *dp = q->dp;
abstime_t time;
time = snd_seq_oss_timer_cur_tick(dp->timer);
if (q->sync_time >= time)
return 0; /* already finished */
if (! q->sync_event_put) {
struct snd_seq_event ev;
union evrec *rec;
/* put echoback event */
memset(&ev, 0, sizeof(ev));
ev.flags = 0;
ev.type = SNDRV_SEQ_EVENT_ECHO;
ev.time.tick = time;
/* echo back to itself */
snd_seq_oss_fill_addr(dp, &ev, dp->addr.client, dp->addr.port);
rec = (union evrec *)&ev.data;
rec->t.code = SEQ_SYNCTIMER;
rec->t.time = time;
q->sync_event_put = 1;
snd_seq_kernel_client_enqueue_blocking(dp->cseq, &ev, NULL, 0, 0);
}
wait_event_interruptible_timeout(q->sync_sleep, ! q->sync_event_put, HZ);
if (signal_pending(current))
/* interrupted - return 0 to finish sync */
q->sync_event_put = 0;
if (! q->sync_event_put || q->sync_time >= time)
return 0;
return 1;
}
/*
* wake up sync - echo event was catched
*/
void
snd_seq_oss_writeq_wakeup(struct seq_oss_writeq *q, abstime_t time)
{
unsigned long flags;
spin_lock_irqsave(&q->sync_lock, flags);
q->sync_time = time;
q->sync_event_put = 0;
wake_up(&q->sync_sleep);
spin_unlock_irqrestore(&q->sync_lock, flags);
}
/*
* return the unused pool size
*/
int
snd_seq_oss_writeq_get_free_size(struct seq_oss_writeq *q)
{
struct snd_seq_client_pool pool;
pool.client = q->dp->cseq;
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, &pool);
return pool.output_free;
}
/*
* set output threshold size from ioctl
*/
void
snd_seq_oss_writeq_set_output(struct seq_oss_writeq *q, int val)
{
struct snd_seq_client_pool pool;
pool.client = q->dp->cseq;
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, &pool);
pool.output_room = val;
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, &pool);
}
|