blob: da77e41de99004c5e80d2453561e6105553a0f40 [file] [log] [blame]
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +01001/*
2 * Ultra Wide Band
3 * Driver initialization, etc
4 *
5 * Copyright (C) 2005-2006 Intel Corporation
6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 * 02110-1301, USA.
21 *
22 *
23 * FIXME: docs
24 *
25 * Life cycle: FIXME: explain
26 *
27 * UWB radio controller:
28 *
29 * 1. alloc a uwb_rc, zero it
30 * 2. call uwb_rc_init() on it to set it up + ops (won't do any
31 * kind of allocation)
32 * 3. register (now it is owned by the UWB stack--deregister before
33 * freeing/destroying).
34 * 4. It lives on it's own now (UWB stack handles)--when it
35 * disconnects, call unregister()
36 * 5. free it.
37 *
38 * Make sure you have a reference to the uwb_rc before calling
39 * any of the UWB API functions.
40 *
41 * TODO:
42 *
43 * 1. Locking and life cycle management is crappy still. All entry
44 * points to the UWB HCD API assume you have a reference on the
45 * uwb_rc structure and that it won't go away. They mutex lock it
46 * before doing anything.
47 */
48
49#include <linux/kernel.h>
50#include <linux/init.h>
51#include <linux/module.h>
52#include <linux/device.h>
53#include <linux/err.h>
54#include <linux/kdev_t.h>
55#include <linux/random.h>
David Vrabela01777e2008-12-22 18:30:29 +000056
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +010057#include "uwb-internal.h"
58
59
60/* UWB stack attributes (or 'global' constants) */
61
62
63/**
64 * If a beacon dissapears for longer than this, then we consider the
65 * device who was represented by that beacon to be gone.
66 *
67 * ECMA-368[17.2.3, last para] establishes that a device must not
68 * consider a device to be its neighbour if he doesn't receive a beacon
69 * for more than mMaxLostBeacons. mMaxLostBeacons is defined in
70 * ECMA-368[17.16] as 3; because we can get only one beacon per
71 * superframe, that'd be 3 * 65ms = 195 ~ 200 ms. Let's give it time
72 * for jitter and stuff and make it 500 ms.
73 */
74unsigned long beacon_timeout_ms = 500;
75
76static
77ssize_t beacon_timeout_ms_show(struct class *class, char *buf)
78{
79 return scnprintf(buf, PAGE_SIZE, "%lu\n", beacon_timeout_ms);
80}
81
82static
83ssize_t beacon_timeout_ms_store(struct class *class,
84 const char *buf, size_t size)
85{
86 unsigned long bt;
87 ssize_t result;
88 result = sscanf(buf, "%lu", &bt);
89 if (result != 1)
90 return -EINVAL;
91 beacon_timeout_ms = bt;
92 return size;
93}
94
95static struct class_attribute uwb_class_attrs[] = {
96 __ATTR(beacon_timeout_ms, S_IWUSR | S_IRUGO,
97 beacon_timeout_ms_show, beacon_timeout_ms_store),
98 __ATTR_NULL,
99};
100
101/** Device model classes */
102struct class uwb_rc_class = {
103 .name = "uwb_rc",
104 .class_attrs = uwb_class_attrs,
105};
106
107
108static int __init uwb_subsys_init(void)
109{
110 int result = 0;
111
112 result = uwb_est_create();
113 if (result < 0) {
114 printk(KERN_ERR "uwb: Can't initialize EST subsystem\n");
115 goto error_est_init;
116 }
117
118 result = class_register(&uwb_rc_class);
119 if (result < 0)
120 goto error_uwb_rc_class_register;
David Vrabel9d53b1b2008-09-17 16:34:34 +0100121 uwb_dbg_init();
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100122 return 0;
123
124error_uwb_rc_class_register:
125 uwb_est_destroy();
126error_est_init:
127 return result;
128}
129module_init(uwb_subsys_init);
130
131static void __exit uwb_subsys_exit(void)
132{
David Vrabel9d53b1b2008-09-17 16:34:34 +0100133 uwb_dbg_exit();
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100134 class_unregister(&uwb_rc_class);
135 uwb_est_destroy();
136 return;
137}
138module_exit(uwb_subsys_exit);
139
140MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
141MODULE_DESCRIPTION("Ultra Wide Band core");
142MODULE_LICENSE("GPL");