1 /*
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>
56
57 #include "uwb-internal.h"
58
59
60 /* UWB stack attributes (or 'global' constants) */
61
62
63 /**
64 * If a beacon disappears 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 */
74 unsigned long beacon_timeout_ms = 500;
75
76 static
beacon_timeout_ms_show(struct class * class,struct class_attribute * attr,char * buf)77 ssize_t beacon_timeout_ms_show(struct class *class,
78 struct class_attribute *attr,
79 char *buf)
80 {
81 return scnprintf(buf, PAGE_SIZE, "%lu\n", beacon_timeout_ms);
82 }
83
84 static
beacon_timeout_ms_store(struct class * class,struct class_attribute * attr,const char * buf,size_t size)85 ssize_t beacon_timeout_ms_store(struct class *class,
86 struct class_attribute *attr,
87 const char *buf, size_t size)
88 {
89 unsigned long bt;
90 ssize_t result;
91 result = sscanf(buf, "%lu", &bt);
92 if (result != 1)
93 return -EINVAL;
94 beacon_timeout_ms = bt;
95 return size;
96 }
97 static CLASS_ATTR_RW(beacon_timeout_ms);
98
99 static struct attribute *uwb_class_attrs[] = {
100 &class_attr_beacon_timeout_ms.attr,
101 NULL,
102 };
103 ATTRIBUTE_GROUPS(uwb_class);
104
105 /** Device model classes */
106 struct class uwb_rc_class = {
107 .name = "uwb_rc",
108 .class_groups = uwb_class_groups,
109 };
110
111
uwb_subsys_init(void)112 static int __init uwb_subsys_init(void)
113 {
114 int result = 0;
115
116 result = uwb_est_create();
117 if (result < 0) {
118 printk(KERN_ERR "uwb: Can't initialize EST subsystem\n");
119 goto error_est_init;
120 }
121
122 result = class_register(&uwb_rc_class);
123 if (result < 0)
124 goto error_uwb_rc_class_register;
125
126 /* Register the UWB bus */
127 result = bus_register(&uwb_bus_type);
128 if (result) {
129 pr_err("%s - registering bus driver failed\n", __func__);
130 goto exit_bus;
131 }
132
133 uwb_dbg_init();
134 return 0;
135
136 exit_bus:
137 class_unregister(&uwb_rc_class);
138 error_uwb_rc_class_register:
139 uwb_est_destroy();
140 error_est_init:
141 return result;
142 }
143 module_init(uwb_subsys_init);
144
uwb_subsys_exit(void)145 static void __exit uwb_subsys_exit(void)
146 {
147 uwb_dbg_exit();
148 bus_unregister(&uwb_bus_type);
149 class_unregister(&uwb_rc_class);
150 uwb_est_destroy();
151 return;
152 }
153 module_exit(uwb_subsys_exit);
154
155 MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
156 MODULE_DESCRIPTION("Ultra Wide Band core");
157 MODULE_LICENSE("GPL");
158