158 lines
4.0 KiB
C
158 lines
4.0 KiB
C
/*
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* Ultra Wide Band
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* Driver initialization, etc
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* FIXME: docs
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*
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* Life cycle: FIXME: explain
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*
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* UWB radio controller:
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*
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* 1. alloc a uwb_rc, zero it
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* 2. call uwb_rc_init() on it to set it up + ops (won't do any
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* kind of allocation)
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* 3. register (now it is owned by the UWB stack--deregister before
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* freeing/destroying).
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* 4. It lives on it's own now (UWB stack handles)--when it
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* disconnects, call unregister()
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* 5. free it.
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*
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* Make sure you have a reference to the uwb_rc before calling
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* any of the UWB API functions.
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*
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* TODO:
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*
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* 1. Locking and life cycle management is crappy still. All entry
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* points to the UWB HCD API assume you have a reference on the
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* uwb_rc structure and that it won't go away. They mutex lock it
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* before doing anything.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kdev_t.h>
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#include <linux/random.h>
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#include "uwb-internal.h"
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/* UWB stack attributes (or 'global' constants) */
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/**
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* If a beacon disappears for longer than this, then we consider the
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* device who was represented by that beacon to be gone.
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*
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* ECMA-368[17.2.3, last para] establishes that a device must not
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* consider a device to be its neighbour if he doesn't receive a beacon
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* for more than mMaxLostBeacons. mMaxLostBeacons is defined in
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* ECMA-368[17.16] as 3; because we can get only one beacon per
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* superframe, that'd be 3 * 65ms = 195 ~ 200 ms. Let's give it time
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* for jitter and stuff and make it 500 ms.
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*/
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unsigned long beacon_timeout_ms = 500;
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static
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ssize_t beacon_timeout_ms_show(struct class *class,
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struct class_attribute *attr,
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char *buf)
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{
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return scnprintf(buf, PAGE_SIZE, "%lu\n", beacon_timeout_ms);
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}
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static
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ssize_t beacon_timeout_ms_store(struct class *class,
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struct class_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned long bt;
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ssize_t result;
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result = sscanf(buf, "%lu", &bt);
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if (result != 1)
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return -EINVAL;
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beacon_timeout_ms = bt;
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return size;
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}
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static CLASS_ATTR_RW(beacon_timeout_ms);
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static struct attribute *uwb_class_attrs[] = {
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&class_attr_beacon_timeout_ms.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(uwb_class);
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/** Device model classes */
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struct class uwb_rc_class = {
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.name = "uwb_rc",
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.class_groups = uwb_class_groups,
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};
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static int __init uwb_subsys_init(void)
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{
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int result = 0;
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result = uwb_est_create();
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if (result < 0) {
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printk(KERN_ERR "uwb: Can't initialize EST subsystem\n");
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goto error_est_init;
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}
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result = class_register(&uwb_rc_class);
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if (result < 0)
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goto error_uwb_rc_class_register;
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/* Register the UWB bus */
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result = bus_register(&uwb_bus_type);
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if (result) {
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pr_err("%s - registering bus driver failed\n", __func__);
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goto exit_bus;
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}
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uwb_dbg_init();
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return 0;
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exit_bus:
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class_unregister(&uwb_rc_class);
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error_uwb_rc_class_register:
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uwb_est_destroy();
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error_est_init:
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return result;
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}
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module_init(uwb_subsys_init);
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static void __exit uwb_subsys_exit(void)
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{
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uwb_dbg_exit();
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bus_unregister(&uwb_bus_type);
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class_unregister(&uwb_rc_class);
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uwb_est_destroy();
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return;
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}
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module_exit(uwb_subsys_exit);
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MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
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MODULE_DESCRIPTION("Ultra Wide Band core");
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MODULE_LICENSE("GPL");
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