ieee802154: add a sysfs representation of WPAN master devices

/*

 * Copyright (C) 2007, 2008, 2009 Siemens AG

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2

 * as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Written by:

 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

 */

#ifndef WPAN_PHY_H

#define WPAN_PHY_H

#include <linux/netdevice.h>

#include <linux/mutex.h>

struct wpan_phy {

	struct mutex pib_lock;

	/*

	 * This is a PIB acording to 802.15.4-2006.

	 * We do not provide timing-related variables, as they

	 * aren't used outside of driver

	 */

	u8 current_channel;

	u8 current_page;

	u32 channels_supported;

	u8 transmit_power;

	u8 cca_mode;

	struct device dev;

	int idx;

	char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));

};

struct wpan_phy *wpan_phy_alloc(size_t priv_size);

int wpan_phy_register(struct device *parent, struct wpan_phy *phy);

void wpan_phy_unregister(struct wpan_phy *phy);

void wpan_phy_free(struct wpan_phy *phy);

static inline void *wpan_phy_priv(struct wpan_phy *phy)

{

	BUG_ON(!phy);

	return &phy->priv;

}

struct wpan_phy *wpan_phy_find(const char *str);

static inline const char *wpan_phy_name(struct wpan_phy *phy)

{

	return dev_name(&phy->dev);

}

#endif

obj-$(CONFIG_IEEE802154) +=	nl802154.o af_802154.o

obj-$(CONFIG_IEEE802154) +=	nl802154.o af_802154.o wpan-class.o

nl802154-y		:= netlink.o nl_policy.o

af_802154-y		:= af_ieee802154.o raw.o dgram.o

/*

 * Copyright (C) 2007, 2008, 2009 Siemens AG

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2

 * as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/device.h>

#include <net/wpan-phy.h>

#define MASTER_SHOW_COMPLEX(name, format_string, args...)		\

static ssize_t name ## _show(struct device *dev,			\

			    struct device_attribute *attr, char *buf)	\

{									\

	struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);	\

	int ret;							\

									\

	mutex_lock(&phy->pib_lock);					\

	ret = sprintf(buf, format_string "\n", args);			\

	mutex_unlock(&phy->pib_lock);					\

	return ret;							\

}

#define MASTER_SHOW(field, format_string)				\

	MASTER_SHOW_COMPLEX(field, format_string, phy->field)

MASTER_SHOW(current_channel, "%d");

MASTER_SHOW(current_page, "%d");

MASTER_SHOW(channels_supported, "%#x");

MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",

	((signed char) (phy->transmit_power << 2)) >> 2,

	(phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );

MASTER_SHOW(cca_mode, "%d");

static struct device_attribute pmib_attrs[] = {

	__ATTR_RO(current_channel),

	__ATTR_RO(current_page),

	__ATTR_RO(channels_supported),

	__ATTR_RO(transmit_power),

	__ATTR_RO(cca_mode),

	{},

};

static void wpan_phy_release(struct device *d)

{

	struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);

	kfree(phy);

}

static struct class wpan_phy_class = {

	.name = "ieee802154",

	.dev_release = wpan_phy_release,

	.dev_attrs = pmib_attrs,

};

static DEFINE_MUTEX(wpan_phy_mutex);

static int wpan_phy_idx;

static int wpan_phy_match(struct device *dev, void *data)

{

	return !strcmp(dev_name(dev), (const char *)data);

}

struct wpan_phy *wpan_phy_find(const char *str)

{

	struct device *dev;

	if (WARN_ON(!str))

		return NULL;

	dev = class_find_device(&wpan_phy_class, NULL,

			(void *)str, wpan_phy_match);

	if (!dev)

		return NULL;

	return container_of(dev, struct wpan_phy, dev);

}

EXPORT_SYMBOL(wpan_phy_find);

static int wpan_phy_idx_valid(int idx)

{

	return idx >= 0;

}

struct wpan_phy *wpan_phy_alloc(size_t priv_size)

{

	struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,

			GFP_KERNEL);

	mutex_lock(&wpan_phy_mutex);

	phy->idx = wpan_phy_idx++;

	if (unlikely(!wpan_phy_idx_valid(phy->idx))) {

		wpan_phy_idx--;

		mutex_unlock(&wpan_phy_mutex);

		kfree(phy);

		return NULL;

	}

	mutex_unlock(&wpan_phy_mutex);

	mutex_init(&phy->pib_lock);

	device_initialize(&phy->dev);

	dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);

	phy->dev.class = &wpan_phy_class;

	return phy;

}

EXPORT_SYMBOL(wpan_phy_alloc);

int wpan_phy_register(struct device *parent, struct wpan_phy *phy)

{

	phy->dev.parent = parent;

	return device_add(&phy->dev);

}

EXPORT_SYMBOL(wpan_phy_register);

void wpan_phy_unregister(struct wpan_phy *phy)

{

	device_del(&phy->dev);

}

EXPORT_SYMBOL(wpan_phy_unregister);

void wpan_phy_free(struct wpan_phy *phy)

{

	put_device(&phy->dev);

}

EXPORT_SYMBOL(wpan_phy_free);

static int __init wpan_phy_class_init(void)

{

	return class_register(&wpan_phy_class);

}

subsys_initcall(wpan_phy_class_init);

static void __exit wpan_phy_class_exit(void)

{

	class_unregister(&wpan_phy_class);

}

module_exit(wpan_phy_class_exit);

MODULE_DESCRIPTION("IEEE 802.15.4 device class");

MODULE_LICENSE("GPL v2");