1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/eicon/dqueue.c b/drivers/isdn/hardware/eicon/dqueue.c
new file mode 100644
index 00000000..7958a253
--- /dev/null
+++ b/drivers/isdn/hardware/eicon/dqueue.c
@@ -0,0 +1,110 @@
+/* $Id: dqueue.c,v 1.5 2003/04/12 21:40:49 schindler Exp $
+ *
+ * Driver for Eicon DIVA Server ISDN cards.
+ * User Mode IDI Interface
+ *
+ * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
+ * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#include "platform.h"
+#include "dqueue.h"
+
+int
+diva_data_q_init(diva_um_idi_data_queue_t *q,
+		 int max_length, int max_segments)
+{
+	int i;
+
+	q->max_length = max_length;
+	q->segments = max_segments;
+
+	for (i = 0; i < q->segments; i++) {
+		q->data[i] = NULL;
+		q->length[i] = 0;
+	}
+	q->read = q->write = q->count = q->segment_pending = 0;
+
+	for (i = 0; i < q->segments; i++) {
+		if (!(q->data[i] = diva_os_malloc(0, q->max_length))) {
+			diva_data_q_finit(q);
+			return (-1);
+		}
+	}
+
+	return (0);
+}
+
+int diva_data_q_finit(diva_um_idi_data_queue_t *q)
+{
+	int i;
+
+	for (i = 0; i < q->segments; i++) {
+		if (q->data[i]) {
+			diva_os_free(0, q->data[i]);
+		}
+		q->data[i] = NULL;
+		q->length[i] = 0;
+	}
+	q->read = q->write = q->count = q->segment_pending = 0;
+
+	return (0);
+}
+
+int diva_data_q_get_max_length(const diva_um_idi_data_queue_t *q)
+{
+	return (q->max_length);
+}
+
+void *diva_data_q_get_segment4write(diva_um_idi_data_queue_t *q)
+{
+	if ((!q->segment_pending) && (q->count < q->segments)) {
+		q->segment_pending = 1;
+		return (q->data[q->write]);
+	}
+
+	return NULL;
+}
+
+void
+diva_data_q_ack_segment4write(diva_um_idi_data_queue_t *q, int length)
+{
+	if (q->segment_pending) {
+		q->length[q->write] = length;
+		q->count++;
+		q->write++;
+		if (q->write >= q->segments) {
+			q->write = 0;
+		}
+		q->segment_pending = 0;
+	}
+}
+
+const void *diva_data_q_get_segment4read(const diva_um_idi_data_queue_t *
+					 q)
+{
+	if (q->count) {
+		return (q->data[q->read]);
+	}
+	return NULL;
+}
+
+int diva_data_q_get_segment_length(const diva_um_idi_data_queue_t *q)
+{
+	return (q->length[q->read]);
+}
+
+void diva_data_q_ack_segment4read(diva_um_idi_data_queue_t *q)
+{
+	if (q->count) {
+		q->length[q->read] = 0;
+		q->count--;
+		q->read++;
+		if (q->read >= q->segments) {
+			q->read = 0;
+		}
+	}
+}