uwb: infrastructure for handling Relinquish Request IEs

The structures and event handler needed to handle Relinish Request IEs
received from neighbors.  Nothing is done with these IEs yet.

Signed-off-by: Stefano Panella <stefano.panella@csr.com>
Signed-off-by: David Vrabel <david.vrabel@csr.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/uwb/ie-rcv.c b/drivers/uwb/ie-rcv.c
new file mode 100644
index 000000000000..917e6d78a798
--- /dev/null
+++ b/drivers/uwb/ie-rcv.c
@@ -0,0 +1,55 @@
+/*
+ * Ultra Wide Band
+ * IE Received notification handling.
+ *
+ * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/bitmap.h>
+#include "uwb-internal.h"
+
+/*
+ * Process an incoming IE Received notification.
+ */
+int uwbd_evt_handle_rc_ie_rcv(struct uwb_event *evt)
+{
+        int result = -EINVAL;
+        struct device *dev = &evt->rc->uwb_dev.dev;
+        struct uwb_rc_evt_ie_rcv *iercv;
+        size_t iesize;
+
+        /* Is there enough data to decode it? */
+        if (evt->notif.size < sizeof(*iercv)) {
+                dev_err(dev, "IE Received notification: Not enough data to "
+                        "decode (%zu vs %zu bytes needed)\n",
+                        evt->notif.size, sizeof(*iercv));
+                goto error;
+        }
+        iercv = container_of(evt->notif.rceb, struct uwb_rc_evt_ie_rcv, rceb);
+        iesize = le16_to_cpu(iercv->wIELength);
+
+        dev_dbg(dev, "IE received, element ID=%d\n", iercv->IEData[0]);
+
+        if (iercv->IEData[0] == UWB_RELINQUISH_REQUEST_IE) {
+                dev_warn(dev, "unhandled Relinquish Request IE\n");
+        }
+
+        return 0;
+error:
+        return result;
+}