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path: root/drivers/accessibility/speakup/thread.c
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Diffstat (limited to 'drivers/accessibility/speakup/thread.c')
-rw-r--r--drivers/accessibility/speakup/thread.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/accessibility/speakup/thread.c b/drivers/accessibility/speakup/thread.c
new file mode 100644
index 000000000000..2fc75e60fbac
--- /dev/null
+++ b/drivers/accessibility/speakup/thread.c
@@ -0,0 +1,62 @@
+// 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;
+}