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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/uwb/driver.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/uwb/driver.c')
-rw-r--r--kernel/drivers/uwb/driver.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/kernel/drivers/uwb/driver.c b/kernel/drivers/uwb/driver.c
new file mode 100644
index 000000000..776bcb3c2
--- /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");