wpan-class.c revision 3193502e5b2af4ff2c6df7f711713676645f91c5 
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