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1 | /* |
2 | * Copyright (C) 2007, 2008, 2009 Siemens AG | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/device.h> | |
22 | ||
23 | #include <net/wpan-phy.h> | |
24 | ||
25 | #define MASTER_SHOW_COMPLEX(name, format_string, args...) \ | |
26 | static ssize_t name ## _show(struct device *dev, \ | |
27 | struct device_attribute *attr, char *buf) \ | |
28 | { \ | |
29 | struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \ | |
30 | int ret; \ | |
31 | \ | |
32 | mutex_lock(&phy->pib_lock); \ | |
33 | ret = sprintf(buf, format_string "\n", args); \ | |
34 | mutex_unlock(&phy->pib_lock); \ | |
35 | return ret; \ | |
36 | } | |
37 | ||
38 | #define MASTER_SHOW(field, format_string) \ | |
39 | MASTER_SHOW_COMPLEX(field, format_string, phy->field) | |
40 | ||
41 | MASTER_SHOW(current_channel, "%d"); | |
42 | MASTER_SHOW(current_page, "%d"); | |
43 | MASTER_SHOW(channels_supported, "%#x"); | |
44 | MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB", | |
45 | ((signed char) (phy->transmit_power << 2)) >> 2, | |
46 | (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 ); | |
47 | MASTER_SHOW(cca_mode, "%d"); | |
48 | ||
49 | static struct device_attribute pmib_attrs[] = { | |
50 | __ATTR_RO(current_channel), | |
51 | __ATTR_RO(current_page), | |
52 | __ATTR_RO(channels_supported), | |
53 | __ATTR_RO(transmit_power), | |
54 | __ATTR_RO(cca_mode), | |
55 | {}, | |
56 | }; | |
57 | ||
58 | static void wpan_phy_release(struct device *d) | |
59 | { | |
60 | struct wpan_phy *phy = container_of(d, struct wpan_phy, dev); | |
61 | kfree(phy); | |
62 | } | |
63 | ||
64 | static struct class wpan_phy_class = { | |
65 | .name = "ieee802154", | |
66 | .dev_release = wpan_phy_release, | |
67 | .dev_attrs = pmib_attrs, | |
68 | }; | |
69 | ||
70 | static DEFINE_MUTEX(wpan_phy_mutex); | |
71 | static int wpan_phy_idx; | |
72 | ||
73 | static int wpan_phy_match(struct device *dev, void *data) | |
74 | { | |
75 | return !strcmp(dev_name(dev), (const char *)data); | |
76 | } | |
77 | ||
78 | struct wpan_phy *wpan_phy_find(const char *str) | |
79 | { | |
80 | struct device *dev; | |
81 | ||
82 | if (WARN_ON(!str)) | |
83 | return NULL; | |
84 | ||
85 | dev = class_find_device(&wpan_phy_class, NULL, | |
86 | (void *)str, wpan_phy_match); | |
87 | if (!dev) | |
88 | return NULL; | |
89 | ||
90 | return container_of(dev, struct wpan_phy, dev); | |
91 | } | |
92 | EXPORT_SYMBOL(wpan_phy_find); | |
93 | ||
94 | static int wpan_phy_idx_valid(int idx) | |
95 | { | |
96 | return idx >= 0; | |
97 | } | |
98 | ||
99 | struct wpan_phy *wpan_phy_alloc(size_t priv_size) | |
100 | { | |
101 | struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size, | |
102 | GFP_KERNEL); | |
103 | ||
104 | mutex_lock(&wpan_phy_mutex); | |
105 | phy->idx = wpan_phy_idx++; | |
106 | if (unlikely(!wpan_phy_idx_valid(phy->idx))) { | |
107 | wpan_phy_idx--; | |
108 | mutex_unlock(&wpan_phy_mutex); | |
109 | kfree(phy); | |
110 | return NULL; | |
111 | } | |
112 | mutex_unlock(&wpan_phy_mutex); | |
113 | ||
114 | mutex_init(&phy->pib_lock); | |
115 | ||
116 | device_initialize(&phy->dev); | |
117 | dev_set_name(&phy->dev, "wpan-phy%d", phy->idx); | |
118 | ||
119 | phy->dev.class = &wpan_phy_class; | |
120 | ||
121 | return phy; | |
122 | } | |
123 | EXPORT_SYMBOL(wpan_phy_alloc); | |
124 | ||
125 | int wpan_phy_register(struct device *parent, struct wpan_phy *phy) | |
126 | { | |
127 | phy->dev.parent = parent; | |
128 | ||
129 | return device_add(&phy->dev); | |
130 | } | |
131 | EXPORT_SYMBOL(wpan_phy_register); | |
132 | ||
133 | void wpan_phy_unregister(struct wpan_phy *phy) | |
134 | { | |
135 | device_del(&phy->dev); | |
136 | } | |
137 | EXPORT_SYMBOL(wpan_phy_unregister); | |
138 | ||
139 | void wpan_phy_free(struct wpan_phy *phy) | |
140 | { | |
141 | put_device(&phy->dev); | |
142 | } | |
143 | EXPORT_SYMBOL(wpan_phy_free); | |
144 | ||
145 | static int __init wpan_phy_class_init(void) | |
146 | { | |
147 | return class_register(&wpan_phy_class); | |
148 | } | |
149 | subsys_initcall(wpan_phy_class_init); | |
150 | ||
151 | static void __exit wpan_phy_class_exit(void) | |
152 | { | |
153 | class_unregister(&wpan_phy_class); | |
154 | } | |
155 | module_exit(wpan_phy_class_exit); | |
156 | ||
157 | MODULE_DESCRIPTION("IEEE 802.15.4 device class"); | |
158 | MODULE_LICENSE("GPL v2"); | |
159 |