1 files changed, 110 insertions, 0 deletions
diff --git a/testsuites/libtests/can01/can-loopback.c b/testsuites/libtests/can01/can-loopback.c
new file mode 100644
index 0000000000..0aaf2f6a6d
--- /dev/null
+++ b/testsuites/libtests/can01/can-loopback.c
@@ -0,0 +1,110 @@
+/**
+ * @file
+ *
+ * @ingroup CANBus
+ *
+ * @brief Controller Area Network (CAN) loopback device Implementation
+ *
+ */
+
+/*
+ * Copyright (C) 2022 Prashanth S (fishesprashanth@gmail.com)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <dev/can/can.h>
+
+struct can_loopback_priv {
+  struct can_bus *bus;
+};
+
+static bool can_loopback_tx_ready(void *data);
+static void can_loopback_int(void *data, bool flag);
+static int can_loopback_tx(void *data, struct can_msg *msg);
+int can_loopback_init(const char *can_dev_file);
+
+static struct can_dev_ops dev_ops = {
+  .dev_tx       = can_loopback_tx,
+  .dev_tx_ready = can_loopback_tx_ready,
+  .dev_int      = can_loopback_int,
+};
+
+static bool can_loopback_tx_ready(void *data)
+{
+  return true;
+}
+
+static void can_loopback_int(void *data, bool flag)
+{
+  return;
+}
+
+static int can_loopback_tx(void *data, struct can_msg *msg)
+{
+  struct can_loopback_priv *priv = data;
+
+  can_receive(priv->bus, msg);
+
+  return RTEMS_SUCCESSFUL;
+}
+
+int can_loopback_init(const char *can_dev_file)
+{
+  int ret;
+  struct can_loopback_priv *priv = NULL;
+
+  struct can_bus *bus = can_bus_alloc_and_init(sizeof(struct can_bus));
+  if (bus == NULL) {
+    CAN_ERR("can_loopback_init: can_bus_alloc_and_init failed\n");
+    return RTEMS_NO_MEMORY;
+  }
+
+  priv = (struct can_loopback_priv *)calloc(1, sizeof(struct can_loopback_priv));
+  if (priv == NULL) {
+    CAN_ERR("can_loopback_init: calloc failed\n");
+    ret = RTEMS_NO_MEMORY;
+    goto free_bus_return;
+  }
+
+  priv->bus = bus;
+  bus->priv = priv;
+
+  priv->bus->can_dev_ops = &dev_ops;
+
+  if ((ret = can_bus_register(bus, can_dev_file)) != RTEMS_SUCCESSFUL) {
+    CAN_ERR("can_loopback_init: bus register failed\n");
+    goto free_priv_return;
+  }
+
+  CAN_DEBUG("can_loopback_init: can_loopback driver registered\n");
+
+  return ret;
+
+free_priv_return:
+  free(priv);
+
+free_bus_return:
+  free(bus);
+
+  return ret;
+}