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/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} \
40static DEVICE_ATTR_RO(name);
41
42#define MASTER_SHOW(field, format_string) \
43    MASTER_SHOW_COMPLEX(field, format_string, phy->field)
44
45MASTER_SHOW(current_channel, "%d");
46MASTER_SHOW(current_page, "%d");
47MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",
48    ((signed char) (phy->transmit_power << 2)) >> 2,
49    (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
50MASTER_SHOW(cca_mode, "%d");
51
52static ssize_t channels_supported_show(struct device *dev,
53                struct device_attribute *attr, char *buf)
54{
55    struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
56    int ret;
57    int i, len = 0;
58
59    mutex_lock(&phy->pib_lock);
60    for (i = 0; i < 32; i++) {
61        ret = snprintf(buf + len, PAGE_SIZE - len,
62                "%#09x\n", phy->channels_supported[i]);
63        if (ret < 0)
64            break;
65        len += ret;
66    }
67    mutex_unlock(&phy->pib_lock);
68    return len;
69}
70static DEVICE_ATTR_RO(channels_supported);
71
72static struct attribute *pmib_attrs[] = {
73    &dev_attr_current_channel.attr,
74    &dev_attr_current_page.attr,
75    &dev_attr_channels_supported.attr,
76    &dev_attr_transmit_power.attr,
77    &dev_attr_cca_mode.attr,
78    NULL,
79};
80ATTRIBUTE_GROUPS(pmib);
81
82static void wpan_phy_release(struct device *d)
83{
84    struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
85    kfree(phy);
86}
87
88static struct class wpan_phy_class = {
89    .name = "ieee802154",
90    .dev_release = wpan_phy_release,
91    .dev_groups = pmib_groups,
92};
93
94static DEFINE_MUTEX(wpan_phy_mutex);
95static int wpan_phy_idx;
96
97static int wpan_phy_match(struct device *dev, const void *data)
98{
99    return !strcmp(dev_name(dev), (const char *)data);
100}
101
102struct wpan_phy *wpan_phy_find(const char *str)
103{
104    struct device *dev;
105
106    if (WARN_ON(!str))
107        return NULL;
108
109    dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match);
110    if (!dev)
111        return NULL;
112
113    return container_of(dev, struct wpan_phy, dev);
114}
115EXPORT_SYMBOL(wpan_phy_find);
116
117struct wpan_phy_iter_data {
118    int (*fn)(struct wpan_phy *phy, void *data);
119    void *data;
120};
121
122static int wpan_phy_iter(struct device *dev, void *_data)
123{
124    struct wpan_phy_iter_data *wpid = _data;
125    struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
126    return wpid->fn(phy, wpid->data);
127}
128
129int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
130        void *data)
131{
132    struct wpan_phy_iter_data wpid = {
133        .fn = fn,
134        .data = data,
135    };
136
137    return class_for_each_device(&wpan_phy_class, NULL,
138            &wpid, wpan_phy_iter);
139}
140EXPORT_SYMBOL(wpan_phy_for_each);
141
142static int wpan_phy_idx_valid(int idx)
143{
144    return idx >= 0;
145}
146
147struct wpan_phy *wpan_phy_alloc(size_t priv_size)
148{
149    struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
150            GFP_KERNEL);
151
152    if (!phy)
153        goto out;
154    mutex_lock(&wpan_phy_mutex);
155    phy->idx = wpan_phy_idx++;
156    if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
157        wpan_phy_idx--;
158        mutex_unlock(&wpan_phy_mutex);
159        kfree(phy);
160        goto out;
161    }
162    mutex_unlock(&wpan_phy_mutex);
163
164    mutex_init(&phy->pib_lock);
165
166    device_initialize(&phy->dev);
167    dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
168
169    phy->dev.class = &wpan_phy_class;
170
171    phy->current_channel = -1; /* not initialised */
172    phy->current_page = 0; /* for compatibility */
173
174    return phy;
175
176out:
177    return NULL;
178}
179EXPORT_SYMBOL(wpan_phy_alloc);
180
181int wpan_phy_register(struct wpan_phy *phy)
182{
183    return device_add(&phy->dev);
184}
185EXPORT_SYMBOL(wpan_phy_register);
186
187void wpan_phy_unregister(struct wpan_phy *phy)
188{
189    device_del(&phy->dev);
190}
191EXPORT_SYMBOL(wpan_phy_unregister);
192
193void wpan_phy_free(struct wpan_phy *phy)
194{
195    put_device(&phy->dev);
196}
197EXPORT_SYMBOL(wpan_phy_free);
198
199static int __init wpan_phy_class_init(void)
200{
201    int rc;
202    rc = class_register(&wpan_phy_class);
203    if (rc)
204        goto err;
205
206    rc = ieee802154_nl_init();
207    if (rc)
208        goto err_nl;
209
210    return 0;
211err_nl:
212    class_unregister(&wpan_phy_class);
213err:
214    return rc;
215}
216subsys_initcall(wpan_phy_class_init);
217
218static void __exit wpan_phy_class_exit(void)
219{
220    ieee802154_nl_exit();
221    class_unregister(&wpan_phy_class);
222}
223module_exit(wpan_phy_class_exit);
224
225MODULE_LICENSE("GPL v2");
226MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
227MODULE_AUTHOR("Dmitry Eremin-Solenikov");
228
229

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