Root/net/ieee802154/wpan-class.c

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...) \
26static 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
41MASTER_SHOW(current_channel, "%d");
42MASTER_SHOW(current_page, "%d");
43MASTER_SHOW(channels_supported, "%#x");
44MASTER_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 );
47MASTER_SHOW(cca_mode, "%d");
48
49static 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
58static 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
64static struct class wpan_phy_class = {
65    .name = "ieee802154",
66    .dev_release = wpan_phy_release,
67    .dev_attrs = pmib_attrs,
68};
69
70static DEFINE_MUTEX(wpan_phy_mutex);
71static int wpan_phy_idx;
72
73static int wpan_phy_match(struct device *dev, void *data)
74{
75    return !strcmp(dev_name(dev), (const char *)data);
76}
77
78struct 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}
92EXPORT_SYMBOL(wpan_phy_find);
93
94static int wpan_phy_idx_valid(int idx)
95{
96    return idx >= 0;
97}
98
99struct 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}
123EXPORT_SYMBOL(wpan_phy_alloc);
124
125int wpan_phy_register(struct device *parent, struct wpan_phy *phy)
126{
127    phy->dev.parent = parent;
128
129    return device_add(&phy->dev);
130}
131EXPORT_SYMBOL(wpan_phy_register);
132
133void wpan_phy_unregister(struct wpan_phy *phy)
134{
135    device_del(&phy->dev);
136}
137EXPORT_SYMBOL(wpan_phy_unregister);
138
139void wpan_phy_free(struct wpan_phy *phy)
140{
141    put_device(&phy->dev);
142}
143EXPORT_SYMBOL(wpan_phy_free);
144
145static int __init wpan_phy_class_init(void)
146{
147    return class_register(&wpan_phy_class);
148}
149subsys_initcall(wpan_phy_class_init);
150
151static void __exit wpan_phy_class_exit(void)
152{
153    class_unregister(&wpan_phy_class);
154}
155module_exit(wpan_phy_class_exit);
156
157MODULE_DESCRIPTION("IEEE 802.15.4 device class");
158MODULE_LICENSE("GPL v2");
159
160

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