Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / isdn / hardware / eicon / dqueue.c

diff --git a/kernel/drivers/isdn/hardware/eicon/dqueue.c b/kernel/drivers/isdn/hardware/eicon/dqueue.c
new file mode 100644 (file)
index 0000000..7958a25
--- /dev/null
+++ b/kernel/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;
+               }
+       }
+}