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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 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 | */ |
74 | unsigned long beacon_timeout_ms = 500; |
75 | |
76 | static |
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 |
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 | |
98 | static struct class_attribute uwb_class_attrs[] = { |
99 | __ATTR(beacon_timeout_ms, S_IWUSR | S_IRUGO, |
100 | beacon_timeout_ms_show, beacon_timeout_ms_store), |
101 | __ATTR_NULL, |
102 | }; |
103 | |
104 | /** Device model classes */ |
105 | struct class uwb_rc_class = { |
106 | .name = "uwb_rc", |
107 | .class_attrs = uwb_class_attrs, |
108 | }; |
109 | |
110 | |
111 | static int __init uwb_subsys_init(void) |
112 | { |
113 | int result = 0; |
114 | |
115 | result = uwb_est_create(); |
116 | if (result < 0) { |
117 | printk(KERN_ERR "uwb: Can't initialize EST subsystem\n"); |
118 | goto error_est_init; |
119 | } |
120 | |
121 | result = class_register(&uwb_rc_class); |
122 | if (result < 0) |
123 | goto error_uwb_rc_class_register; |
124 | uwb_dbg_init(); |
125 | return 0; |
126 | |
127 | error_uwb_rc_class_register: |
128 | uwb_est_destroy(); |
129 | error_est_init: |
130 | return result; |
131 | } |
132 | module_init(uwb_subsys_init); |
133 | |
134 | static void __exit uwb_subsys_exit(void) |
135 | { |
136 | uwb_dbg_exit(); |
137 | class_unregister(&uwb_rc_class); |
138 | uwb_est_destroy(); |
139 | return; |
140 | } |
141 | module_exit(uwb_subsys_exit); |
142 | |
143 | MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>"); |
144 | MODULE_DESCRIPTION("Ultra Wide Band core"); |
145 | MODULE_LICENSE("GPL"); |
146 |
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