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(transmit_power, "%d +- 1 dB");
48MASTER_SHOW(cca_mode, "%d");
49
50static ssize_t channels_supported_show(struct device *dev,
51				       struct device_attribute *attr,
52				       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}
69static DEVICE_ATTR_RO(channels_supported);
70
71static struct attribute *pmib_attrs[] = {
72	&dev_attr_current_channel.attr,
73	&dev_attr_current_page.attr,
74	&dev_attr_channels_supported.attr,
75	&dev_attr_transmit_power.attr,
76	&dev_attr_cca_mode.attr,
77	NULL,
78};
79ATTRIBUTE_GROUPS(pmib);
80
81static void wpan_phy_release(struct device *d)
82{
83	struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
84
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
127	return wpid->fn(phy, wpid->data);
128}
129
130int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
131		      void *data)
132{
133	struct wpan_phy_iter_data wpid = {
134		.fn = fn,
135		.data = data,
136	};
137
138	return class_for_each_device(&wpan_phy_class, NULL,
139			&wpid, wpan_phy_iter);
140}
141EXPORT_SYMBOL(wpan_phy_for_each);
142
143static int wpan_phy_idx_valid(int idx)
144{
145	return idx >= 0;
146}
147
148struct wpan_phy *wpan_phy_alloc(size_t priv_size)
149{
150	struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
151			GFP_KERNEL);
152
153	if (!phy)
154		goto out;
155	mutex_lock(&wpan_phy_mutex);
156	phy->idx = wpan_phy_idx++;
157	if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
158		wpan_phy_idx--;
159		mutex_unlock(&wpan_phy_mutex);
160		kfree(phy);
161		goto out;
162	}
163	mutex_unlock(&wpan_phy_mutex);
164
165	mutex_init(&phy->pib_lock);
166
167	device_initialize(&phy->dev);
168	dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
169
170	phy->dev.class = &wpan_phy_class;
171
172	phy->current_channel = -1; /* not initialised */
173	phy->current_page = 0; /* for compatibility */
174
175	return phy;
176
177out:
178	return NULL;
179}
180EXPORT_SYMBOL(wpan_phy_alloc);
181
182int wpan_phy_register(struct wpan_phy *phy)
183{
184	return device_add(&phy->dev);
185}
186EXPORT_SYMBOL(wpan_phy_register);
187
188void wpan_phy_unregister(struct wpan_phy *phy)
189{
190	device_del(&phy->dev);
191}
192EXPORT_SYMBOL(wpan_phy_unregister);
193
194void wpan_phy_free(struct wpan_phy *phy)
195{
196	put_device(&phy->dev);
197}
198EXPORT_SYMBOL(wpan_phy_free);
199
200static int __init wpan_phy_class_init(void)
201{
202	int rc;
203
204	rc = class_register(&wpan_phy_class);
205	if (rc)
206		goto err;
207
208	rc = ieee802154_nl_init();
209	if (rc)
210		goto err_nl;
211
212	return 0;
213err_nl:
214	class_unregister(&wpan_phy_class);
215err:
216	return rc;
217}
218subsys_initcall(wpan_phy_class_init);
219
220static void __exit wpan_phy_class_exit(void)
221{
222	ieee802154_nl_exit();
223	class_unregister(&wpan_phy_class);
224}
225module_exit(wpan_phy_class_exit);
226
227MODULE_LICENSE("GPL v2");
228MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
229MODULE_AUTHOR("Dmitry Eremin-Solenikov");
230
231