Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include "spk_types.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include "speakup.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include "spk_priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) DECLARE_WAIT_QUEUE_HEAD(speakup_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) EXPORT_SYMBOL_GPL(speakup_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) int speakup_thread(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	int should_break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	struct bleep our_sound;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	our_sound.active = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	our_sound.freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	our_sound.jiffies = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	mutex_lock(&spk_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		DEFINE_WAIT(wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 			spin_lock_irqsave(&speakup_info.spinlock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 			our_sound = spk_unprocessed_sound;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 			spk_unprocessed_sound.active = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 			prepare_to_wait(&speakup_event, &wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 					TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			should_break = kthread_should_stop() ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 				our_sound.active ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 				(synth && synth->catch_up && synth->alive &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 					(speakup_info.flushing ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 					!synth_buffer_empty()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 			if (should_break)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			mutex_unlock(&spk_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 			schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 			mutex_lock(&spk_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		finish_wait(&speakup_event, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		if (kthread_should_stop())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		if (our_sound.active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 			kd_mksound(our_sound.freq, our_sound.jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		if (synth && synth->catch_up && synth->alive) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 			 * It is up to the callee to take the lock, so that it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			 * can sleep whenever it likes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 			synth->catch_up(synth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		speakup_start_ttys();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	mutex_unlock(&spk_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }