1 files changed, 65 insertions, 0 deletions
diff --git a/snd-pcxhr/src/pcxhr_hrtimer.c b/snd-pcxhr/src/pcxhr_hrtimer.c
new file mode 100644
index 0000000..4ccc1bf
--- /dev/null
+++ b/snd-pcxhr/src/pcxhr_hrtimer.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Digigram pcxhr compatible soundcards
+ *
+ * Copyright (c) 2004 by Digigram <alsa@digigram.com>
+ */
+
+
+#include "pcxhr_hrtimer.h"
+
+void pcxhr_hr_timer_tasklet(unsigned long data)
+{
+	pcxhr_interrupt(0, (void*)data);
+}
+
+enum hrtimer_restart pcxhr_hr_timer_callback(struct hrtimer* hr_timer)
+{
+	struct pcxhr_mgr *mgr;
+
+	mgr = container_of(hr_timer, struct pcxhr_mgr, hr_timer);
+	if (!atomic_read(&mgr->hr_timer_running))
+		return HRTIMER_NORESTART;
+	tasklet_schedule(&mgr->hr_timer_tasklet);
+	hrtimer_forward_now(hr_timer, mgr->hr_timer_period_time);
+	return HRTIMER_RESTART;
+}
+
+
+void pcxhr_hr_timer_trig(struct pcxhr_mgr *mgr, int start, unsigned int rate) {
+	if (start)
+	{
+		unsigned int period = mgr->granularity/2;
+		long sec;
+		unsigned long nsecs;
+
+		sec = period/rate;
+		period %= rate;
+		nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
+
+		tasklet_kill(&mgr->hr_timer_tasklet); // Make sure the tasklet is not running.
+		mgr->hr_timer_period_time = ktime_set(sec, nsecs);
+		atomic_set(&mgr->hr_timer_running, 1);
+		hrtimer_start(&mgr->hr_timer, mgr->hr_timer_period_time, HRTIMER_MODE_REL);
+	}
+	else
+	{
+		atomic_set(&mgr->hr_timer_running, 0);
+		hrtimer_cancel(&mgr->hr_timer);
+	}
+
+}
+
+
+void pcxhr_hr_timer_init(struct pcxhr_mgr *mgr) {
+	hrtimer_init( &mgr->hr_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL );
+	mgr->hr_timer.function = pcxhr_hr_timer_callback;
+	atomic_set(&mgr->hr_timer_running, 0);
+	tasklet_init(&mgr->hr_timer_tasklet, pcxhr_hr_timer_tasklet,
+		     (unsigned long)mgr);
+
+}
+
+void pcxhr_hr_timer_kill(struct pcxhr_mgr *mgr) {
+	tasklet_kill(&mgr->hr_timer_tasklet);
+}