Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / uwb / driver.c

diff --git a/kernel/drivers/uwb/driver.c b/kernel/drivers/uwb/driver.c
new file mode 100644 (file)
index 0000000..776bcb3
--- /dev/null
+++ b/kernel/drivers/uwb/driver.c
@@ -0,0 +1,156 @@
+/*
+ * Ultra Wide Band
+ * Driver initialization, etc
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * FIXME: docs
+ *
+ * Life cycle: FIXME: explain
+ *
+ *  UWB radio controller:
+ *
+ *    1. alloc a uwb_rc, zero it
+ *    2. call uwb_rc_init() on it to set it up + ops (won't do any
+ *       kind of allocation)
+ *    3. register (now it is owned by the UWB stack--deregister before
+ *       freeing/destroying).
+ *    4. It lives on it's own now (UWB stack handles)--when it
+ *       disconnects, call unregister()
+ *    5. free it.
+ *
+ *    Make sure you have a reference to the uwb_rc before calling
+ *    any of the UWB API functions.
+ *
+ * TODO:
+ *
+ * 1. Locking and life cycle management is crappy still. All entry
+ *    points to the UWB HCD API assume you have a reference on the
+ *    uwb_rc structure and that it won't go away. They mutex lock it
+ *    before doing anything.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/kdev_t.h>
+#include <linux/random.h>
+
+#include "uwb-internal.h"
+
+
+/* UWB stack attributes (or 'global' constants) */
+
+
+/**
+ * If a beacon disappears for longer than this, then we consider the
+ * device who was represented by that beacon to be gone.
+ *
+ * ECMA-368[17.2.3, last para] establishes that a device must not
+ * consider a device to be its neighbour if he doesn't receive a beacon
+ * for more than mMaxLostBeacons. mMaxLostBeacons is defined in
+ * ECMA-368[17.16] as 3; because we can get only one beacon per
+ * superframe, that'd be 3 * 65ms = 195 ~ 200 ms. Let's give it time
+ * for jitter and stuff and make it 500 ms.
+ */
+unsigned long beacon_timeout_ms = 500;
+
+static
+ssize_t beacon_timeout_ms_show(struct class *class,
+                               struct class_attribute *attr,
+                               char *buf)
+{
+       return scnprintf(buf, PAGE_SIZE, "%lu\n", beacon_timeout_ms);
+}
+
+static
+ssize_t beacon_timeout_ms_store(struct class *class,
+                               struct class_attribute *attr,
+                               const char *buf, size_t size)
+{
+       unsigned long bt;
+       ssize_t result;
+       result = sscanf(buf, "%lu", &bt);
+       if (result != 1)
+               return -EINVAL;
+       beacon_timeout_ms = bt;
+       return size;
+}
+
+static struct class_attribute uwb_class_attrs[] = {
+       __ATTR(beacon_timeout_ms, S_IWUSR | S_IRUGO,
+              beacon_timeout_ms_show, beacon_timeout_ms_store),
+       __ATTR_NULL,
+};
+
+/** Device model classes */
+struct class uwb_rc_class = {
+       .name        = "uwb_rc",
+       .class_attrs = uwb_class_attrs,
+};
+
+
+static int __init uwb_subsys_init(void)
+{
+       int result = 0;
+
+       result = uwb_est_create();
+       if (result < 0) {
+               printk(KERN_ERR "uwb: Can't initialize EST subsystem\n");
+               goto error_est_init;
+       }
+
+       result = class_register(&uwb_rc_class);
+       if (result < 0)
+               goto error_uwb_rc_class_register;
+
+       /* Register the UWB bus */
+       result = bus_register(&uwb_bus_type);
+       if (result) {
+               pr_err("%s - registering bus driver failed\n", __func__);
+               goto exit_bus;
+       }
+
+       uwb_dbg_init();
+       return 0;
+
+exit_bus:
+       class_unregister(&uwb_rc_class);
+error_uwb_rc_class_register:
+       uwb_est_destroy();
+error_est_init:
+       return result;
+}
+module_init(uwb_subsys_init);
+
+static void __exit uwb_subsys_exit(void)
+{
+       uwb_dbg_exit();
+       bus_unregister(&uwb_bus_type);
+       class_unregister(&uwb_rc_class);
+       uwb_est_destroy();
+       return;
+}
+module_exit(uwb_subsys_exit);
+
+MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
+MODULE_DESCRIPTION("Ultra Wide Band core");
+MODULE_LICENSE("GPL");