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/*
* 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.
*
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <net/cfg802154.h>
#include <net/rtnetlink.h>
#include "ieee802154.h"
#include "sysfs.h"
#include "core.h"
/* RCU-protected (and RTNL for writers) */
static LIST_HEAD(cfg802154_rdev_list);
static int cfg802154_rdev_list_generation;
static int wpan_phy_match(struct device *dev, const 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, str, wpan_phy_match);
if (!dev)
return NULL;
return container_of(dev, struct wpan_phy, dev);
}
EXPORT_SYMBOL(wpan_phy_find);
struct wpan_phy_iter_data {
int (*fn)(struct wpan_phy *phy, void *data);
void *data;
};
static int wpan_phy_iter(struct device *dev, void *_data)
{
struct wpan_phy_iter_data *wpid = _data;
struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
return wpid->fn(phy, wpid->data);
}
int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
void *data)
{
struct wpan_phy_iter_data wpid = {
.fn = fn,
.data = data,
};
return class_for_each_device(&wpan_phy_class, NULL,
&wpid, wpan_phy_iter);
}
EXPORT_SYMBOL(wpan_phy_for_each);
struct wpan_phy *
wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size)
{
static atomic_t wpan_phy_counter = ATOMIC_INIT(0);
struct cfg802154_registered_device *rdev;
size_t alloc_size;
alloc_size = sizeof(*rdev) + priv_size;
rdev = kzalloc(alloc_size, GFP_KERNEL);
if (!rdev)
return NULL;
rdev->ops = ops;
rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter);
if (unlikely(rdev->wpan_phy_idx < 0)) {
/* ugh, wrapped! */
atomic_dec(&wpan_phy_counter);
kfree(rdev);
return NULL;
}
/* atomic_inc_return makes it start at 1, make it start at 0 */
rdev->wpan_phy_idx--;
mutex_init(&rdev->wpan_phy.pib_lock);
device_initialize(&rdev->wpan_phy.dev);
dev_set_name(&rdev->wpan_phy.dev, "wpan-phy%d", rdev->wpan_phy_idx);
rdev->wpan_phy.dev.class = &wpan_phy_class;
rdev->wpan_phy.dev.platform_data = rdev;
return &rdev->wpan_phy;
}
EXPORT_SYMBOL(wpan_phy_new);
int wpan_phy_register(struct wpan_phy *phy)
{
struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
int ret;
rtnl_lock();
ret = device_add(&phy->dev);
if (ret) {
rtnl_unlock();
return ret;
}
list_add_rcu(&rdev->list, &cfg802154_rdev_list);
cfg802154_rdev_list_generation++;
/* TODO phy registered lock */
rtnl_unlock();
/* TODO nl802154 phy notify */
return 0;
}
EXPORT_SYMBOL(wpan_phy_register);
void wpan_phy_unregister(struct wpan_phy *phy)
{
struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
/* TODO open count */
rtnl_lock();
/* TODO nl802154 phy notify */
/* TODO phy registered lock */
/* TODO WARN_ON wpan_dev_list */
/* First remove the hardware from everywhere, this makes
* it impossible to find from userspace.
*/
list_del_rcu(&rdev->list);
synchronize_rcu();
cfg802154_rdev_list_generation++;
device_del(&phy->dev);
rtnl_unlock();
}
EXPORT_SYMBOL(wpan_phy_unregister);
void wpan_phy_free(struct wpan_phy *phy)
{
put_device(&phy->dev);
}
EXPORT_SYMBOL(wpan_phy_free);
void cfg802154_dev_free(struct cfg802154_registered_device *rdev)
{
kfree(rdev);
}
static int __init wpan_phy_class_init(void)
{
int rc;
rc = wpan_phy_sysfs_init();
if (rc)
goto err;
rc = ieee802154_nl_init();
if (rc)
goto err_nl;
return 0;
err_nl:
wpan_phy_sysfs_exit();
err:
return rc;
}
subsys_initcall(wpan_phy_class_init);
static void __exit wpan_phy_class_exit(void)
{
ieee802154_nl_exit();
wpan_phy_sysfs_exit();
}
module_exit(wpan_phy_class_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
MODULE_AUTHOR("Dmitry Eremin-Solenikov");
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