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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/slab.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/device.h>
23
24#include <net/wpan-phy.h>
25
26#include "ieee802154.h"
27
28#define MASTER_SHOW_COMPLEX(name, format_string, args...) \
29static ssize_t name ## _show(struct device *dev, \
30 struct device_attribute *attr, char *buf) \
31{ \
32 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \
33 int ret; \
34 \
35 mutex_lock(&phy->pib_lock); \
36 ret = snprintf(buf, PAGE_SIZE, format_string "\n", args); \
37 mutex_unlock(&phy->pib_lock); \
38 return ret; \
39}
40
41#define MASTER_SHOW(field, format_string) \
42 MASTER_SHOW_COMPLEX(field, format_string, phy->field)
43
44MASTER_SHOW(current_channel, "%d");
45MASTER_SHOW(current_page, "%d");
46MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",
47 ((signed char) (phy->transmit_power << 2)) >> 2,
48 (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
49MASTER_SHOW(cca_mode, "%d");
50
51static ssize_t channels_supported_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
53{
54 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
55 int ret;
56 int i, len = 0;
57
58 mutex_lock(&phy->pib_lock);
59 for (i = 0; i < 32; i++) {
60 ret = snprintf(buf + len, PAGE_SIZE - len,
61 "%#09x\n", phy->channels_supported[i]);
62 if (ret < 0)
63 break;
64 len += ret;
65 }
66 mutex_unlock(&phy->pib_lock);
67 return len;
68}
69
70static struct device_attribute pmib_attrs[] = {
71 __ATTR_RO(current_channel),
72 __ATTR_RO(current_page),
73 __ATTR_RO(channels_supported),
74 __ATTR_RO(transmit_power),
75 __ATTR_RO(cca_mode),
76 {},
77};
78
79static void wpan_phy_release(struct device *d)
80{
81 struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
82 kfree(phy);
83}
84
85static struct class wpan_phy_class = {
86 .name = "ieee802154",
87 .dev_release = wpan_phy_release,
88 .dev_attrs = pmib_attrs,
89};
90
91static DEFINE_MUTEX(wpan_phy_mutex);
92static int wpan_phy_idx;
93
94static int wpan_phy_match(struct device *dev, void *data)
95{
96 return !strcmp(dev_name(dev), (const char *)data);
97}
98
99struct wpan_phy *wpan_phy_find(const char *str)
100{
101 struct device *dev;
102
103 if (WARN_ON(!str))
104 return NULL;
105
106 dev = class_find_device(&wpan_phy_class, NULL,
107 (void *)str, wpan_phy_match);
108 if (!dev)
109 return NULL;
110
111 return container_of(dev, struct wpan_phy, dev);
112}
113EXPORT_SYMBOL(wpan_phy_find);
114
115struct wpan_phy_iter_data {
116 int (*fn)(struct wpan_phy *phy, void *data);
117 void *data;
118};
119
120static int wpan_phy_iter(struct device *dev, void *_data)
121{
122 struct wpan_phy_iter_data *wpid = _data;
123 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
124 return wpid->fn(phy, wpid->data);
125}
126
127int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
128 void *data)
129{
130 struct wpan_phy_iter_data wpid = {
131 .fn = fn,
132 .data = data,
133 };
134
135 return class_for_each_device(&wpan_phy_class, NULL,
136 &wpid, wpan_phy_iter);
137}
138EXPORT_SYMBOL(wpan_phy_for_each);
139
140static int wpan_phy_idx_valid(int idx)
141{
142 return idx >= 0;
143}
144
145struct wpan_phy *wpan_phy_alloc(size_t priv_size)
146{
147 struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
148 GFP_KERNEL);
149
150 if (!phy)
151 goto out;
152 mutex_lock(&wpan_phy_mutex);
153 phy->idx = wpan_phy_idx++;
154 if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
155 wpan_phy_idx--;
156 mutex_unlock(&wpan_phy_mutex);
157 kfree(phy);
158 goto out;
159 }
160 mutex_unlock(&wpan_phy_mutex);
161
162 mutex_init(&phy->pib_lock);
163
164 device_initialize(&phy->dev);
165 dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
166
167 phy->dev.class = &wpan_phy_class;
168
169 phy->current_channel = -1; /* not initialised */
170 phy->current_page = 0; /* for compatibility */
171
172 return phy;
173
174out:
175 return NULL;
176}
177EXPORT_SYMBOL(wpan_phy_alloc);
178
179int wpan_phy_register(struct wpan_phy *phy)
180{
181 return device_add(&phy->dev);
182}
183EXPORT_SYMBOL(wpan_phy_register);
184
185void wpan_phy_unregister(struct wpan_phy *phy)
186{
187 device_del(&phy->dev);
188}
189EXPORT_SYMBOL(wpan_phy_unregister);
190
191void wpan_phy_free(struct wpan_phy *phy)
192{
193 put_device(&phy->dev);
194}
195EXPORT_SYMBOL(wpan_phy_free);
196
197static int __init wpan_phy_class_init(void)
198{
199 int rc;
200 rc = class_register(&wpan_phy_class);
201 if (rc)
202 goto err;
203
204 rc = ieee802154_nl_init();
205 if (rc)
206 goto err_nl;
207
208 return 0;
209err_nl:
210 class_unregister(&wpan_phy_class);
211err:
212 return rc;
213}
214subsys_initcall(wpan_phy_class_init);
215
216static void __exit wpan_phy_class_exit(void)
217{
218 ieee802154_nl_exit();
219 class_unregister(&wpan_phy_class);
220}
221module_exit(wpan_phy_class_exit);
222
223MODULE_LICENSE("GPL v2");
224MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
225MODULE_AUTHOR("Dmitry Eremin-Solenikov");
226