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// SPDX-License-Identifier: GPL-2.0
#include <linux/kthread.h>
#include <linux/wait.h>
#include "spk_types.h"
#include "speakup.h"
#include "spk_priv.h"
DECLARE_WAIT_QUEUE_HEAD(speakup_event);
EXPORT_SYMBOL_GPL(speakup_event);
int speakup_thread(void *data)
{
unsigned long flags;
int should_break;
struct bleep our_sound;
our_sound.active = 0;
our_sound.freq = 0;
our_sound.jiffies = 0;
mutex_lock(&spk_mutex);
while (1) {
DEFINE_WAIT(wait);
while (1) {
spin_lock_irqsave(&speakup_info.spinlock, flags);
our_sound = spk_unprocessed_sound;
spk_unprocessed_sound.active = 0;
prepare_to_wait(&speakup_event, &wait,
TASK_INTERRUPTIBLE);
should_break = kthread_should_stop() ||
our_sound.active ||
(synth && synth->catch_up && synth->alive &&
(speakup_info.flushing ||
!synth_buffer_empty()));
spin_unlock_irqrestore(&speakup_info.spinlock, flags);
if (should_break)
break;
mutex_unlock(&spk_mutex);
schedule();
mutex_lock(&spk_mutex);
}
finish_wait(&speakup_event, &wait);
if (kthread_should_stop())
break;
if (our_sound.active)
kd_mksound(our_sound.freq, our_sound.jiffies);
if (synth && synth->catch_up && synth->alive) {
/*
* It is up to the callee to take the lock, so that it
* can sleep whenever it likes
*/
synth->catch_up(synth);
}
speakup_start_ttys();
}
mutex_unlock(&spk_mutex);
return 0;
}
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