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, const 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, str, wpan_phy_match);
107	if (!dev)
108		return NULL;
109
110	return container_of(dev, struct wpan_phy, dev);
111}
112EXPORT_SYMBOL(wpan_phy_find);
113
114struct wpan_phy_iter_data {
115	int (*fn)(struct wpan_phy *phy, void *data);
116	void *data;
117};
118
119static int wpan_phy_iter(struct device *dev, void *_data)
120{
121	struct wpan_phy_iter_data *wpid = _data;
122	struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
123	return wpid->fn(phy, wpid->data);
124}
125
126int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
127		void *data)
128{
129	struct wpan_phy_iter_data wpid = {
130		.fn = fn,
131		.data = data,
132	};
133
134	return class_for_each_device(&wpan_phy_class, NULL,
135			&wpid, wpan_phy_iter);
136}
137EXPORT_SYMBOL(wpan_phy_for_each);
138
139static int wpan_phy_idx_valid(int idx)
140{
141	return idx >= 0;
142}
143
144struct wpan_phy *wpan_phy_alloc(size_t priv_size)
145{
146	struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
147			GFP_KERNEL);
148
149	if (!phy)
150		goto out;
151	mutex_lock(&wpan_phy_mutex);
152	phy->idx = wpan_phy_idx++;
153	if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
154		wpan_phy_idx--;
155		mutex_unlock(&wpan_phy_mutex);
156		kfree(phy);
157		goto out;
158	}
159	mutex_unlock(&wpan_phy_mutex);
160
161	mutex_init(&phy->pib_lock);
162
163	device_initialize(&phy->dev);
164	dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
165
166	phy->dev.class = &wpan_phy_class;
167
168	phy->current_channel = -1; /* not initialised */
169	phy->current_page = 0; /* for compatibility */
170
171	return phy;
172
173out:
174	return NULL;
175}
176EXPORT_SYMBOL(wpan_phy_alloc);
177
178int wpan_phy_register(struct wpan_phy *phy)
179{
180	return device_add(&phy->dev);
181}
182EXPORT_SYMBOL(wpan_phy_register);
183
184void wpan_phy_unregister(struct wpan_phy *phy)
185{
186	device_del(&phy->dev);
187}
188EXPORT_SYMBOL(wpan_phy_unregister);
189
190void wpan_phy_free(struct wpan_phy *phy)
191{
192	put_device(&phy->dev);
193}
194EXPORT_SYMBOL(wpan_phy_free);
195
196static int __init wpan_phy_class_init(void)
197{
198	int rc;
199	rc = class_register(&wpan_phy_class);
200	if (rc)
201		goto err;
202
203	rc = ieee802154_nl_init();
204	if (rc)
205		goto err_nl;
206
207	return 0;
208err_nl:
209	class_unregister(&wpan_phy_class);
210err:
211	return rc;
212}
213subsys_initcall(wpan_phy_class_init);
214
215static void __exit wpan_phy_class_exit(void)
216{
217	ieee802154_nl_exit();
218	class_unregister(&wpan_phy_class);
219}
220module_exit(wpan_phy_class_exit);
221
222MODULE_LICENSE("GPL v2");
223MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
224MODULE_AUTHOR("Dmitry Eremin-Solenikov");
225
226