linux/drivers/net/ieee802154/fakelb.c
Alexander Aring e1d299f61a mac802154: remove might_sleep from driver layer
This patch removes all might_sleep calls from driver layer. This
handling is already done by mac802154 layer.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2014-10-28 23:19:07 +01:00

287 lines
6.4 KiB
C

/*
* Loopback IEEE 802.15.4 interface
*
* Copyright 2007-2012 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.
*
* Written by:
* Sergey Lapin <slapin@ossfans.org>
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>
static int numlbs = 1;
struct fakelb_dev_priv {
struct ieee802154_hw *hw;
struct list_head list;
struct fakelb_priv *fake;
spinlock_t lock;
bool working;
};
struct fakelb_priv {
struct list_head list;
rwlock_t lock;
};
static int
fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
{
BUG_ON(!level);
*level = 0xbe;
return 0;
}
static int
fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
pr_debug("set channel to %d\n", channel);
hw->phy->current_page = page;
hw->phy->current_channel = channel;
return 0;
}
static void
fakelb_hw_deliver(struct fakelb_dev_priv *priv, struct sk_buff *skb)
{
struct sk_buff *newskb;
spin_lock(&priv->lock);
if (priv->working) {
newskb = pskb_copy(skb, GFP_ATOMIC);
ieee802154_rx_irqsafe(priv->hw, newskb, 0xcc);
}
spin_unlock(&priv->lock);
}
static int
fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
struct fakelb_dev_priv *priv = hw->priv;
struct fakelb_priv *fake = priv->fake;
read_lock_bh(&fake->lock);
if (priv->list.next == priv->list.prev) {
/* we are the only one device */
fakelb_hw_deliver(priv, skb);
} else {
struct fakelb_dev_priv *dp;
list_for_each_entry(dp, &priv->fake->list, list) {
if (dp != priv &&
(dp->hw->phy->current_channel ==
priv->hw->phy->current_channel))
fakelb_hw_deliver(dp, skb);
}
}
read_unlock_bh(&fake->lock);
return 0;
}
static int
fakelb_hw_start(struct ieee802154_hw *hw) {
struct fakelb_dev_priv *priv = hw->priv;
int ret = 0;
spin_lock(&priv->lock);
if (priv->working)
ret = -EBUSY;
else
priv->working = 1;
spin_unlock(&priv->lock);
return ret;
}
static void
fakelb_hw_stop(struct ieee802154_hw *hw) {
struct fakelb_dev_priv *priv = hw->priv;
spin_lock(&priv->lock);
priv->working = 0;
spin_unlock(&priv->lock);
}
static const struct ieee802154_ops fakelb_ops = {
.owner = THIS_MODULE,
.xmit_sync = fakelb_hw_xmit,
.ed = fakelb_hw_ed,
.set_channel = fakelb_hw_channel,
.start = fakelb_hw_start,
.stop = fakelb_hw_stop,
};
/* Number of dummy devices to be set up by this module. */
module_param(numlbs, int, 0);
MODULE_PARM_DESC(numlbs, " number of pseudo devices");
static int fakelb_add_one(struct device *dev, struct fakelb_priv *fake)
{
struct fakelb_dev_priv *priv;
int err;
struct ieee802154_hw *hw;
hw = ieee802154_alloc_hw(sizeof(*priv), &fakelb_ops);
if (!hw)
return -ENOMEM;
priv = hw->priv;
priv->hw = hw;
/* 868 MHz BPSK 802.15.4-2003 */
hw->phy->channels_supported[0] |= 1;
/* 915 MHz BPSK 802.15.4-2003 */
hw->phy->channels_supported[0] |= 0x7fe;
/* 2.4 GHz O-QPSK 802.15.4-2003 */
hw->phy->channels_supported[0] |= 0x7FFF800;
/* 868 MHz ASK 802.15.4-2006 */
hw->phy->channels_supported[1] |= 1;
/* 915 MHz ASK 802.15.4-2006 */
hw->phy->channels_supported[1] |= 0x7fe;
/* 868 MHz O-QPSK 802.15.4-2006 */
hw->phy->channels_supported[2] |= 1;
/* 915 MHz O-QPSK 802.15.4-2006 */
hw->phy->channels_supported[2] |= 0x7fe;
/* 2.4 GHz CSS 802.15.4a-2007 */
hw->phy->channels_supported[3] |= 0x3fff;
/* UWB Sub-gigahertz 802.15.4a-2007 */
hw->phy->channels_supported[4] |= 1;
/* UWB Low band 802.15.4a-2007 */
hw->phy->channels_supported[4] |= 0x1e;
/* UWB High band 802.15.4a-2007 */
hw->phy->channels_supported[4] |= 0xffe0;
/* 750 MHz O-QPSK 802.15.4c-2009 */
hw->phy->channels_supported[5] |= 0xf;
/* 750 MHz MPSK 802.15.4c-2009 */
hw->phy->channels_supported[5] |= 0xf0;
/* 950 MHz BPSK 802.15.4d-2009 */
hw->phy->channels_supported[6] |= 0x3ff;
/* 950 MHz GFSK 802.15.4d-2009 */
hw->phy->channels_supported[6] |= 0x3ffc00;
INIT_LIST_HEAD(&priv->list);
priv->fake = fake;
spin_lock_init(&priv->lock);
hw->parent = dev;
err = ieee802154_register_hw(hw);
if (err)
goto err_reg;
write_lock_bh(&fake->lock);
list_add_tail(&priv->list, &fake->list);
write_unlock_bh(&fake->lock);
return 0;
err_reg:
ieee802154_free_hw(priv->hw);
return err;
}
static void fakelb_del(struct fakelb_dev_priv *priv)
{
write_lock_bh(&priv->fake->lock);
list_del(&priv->list);
write_unlock_bh(&priv->fake->lock);
ieee802154_unregister_hw(priv->hw);
ieee802154_free_hw(priv->hw);
}
static int fakelb_probe(struct platform_device *pdev)
{
struct fakelb_priv *priv;
struct fakelb_dev_priv *dp;
int err = -ENOMEM;
int i;
priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
GFP_KERNEL);
if (!priv)
goto err_alloc;
INIT_LIST_HEAD(&priv->list);
rwlock_init(&priv->lock);
for (i = 0; i < numlbs; i++) {
err = fakelb_add_one(&pdev->dev, priv);
if (err < 0)
goto err_slave;
}
platform_set_drvdata(pdev, priv);
dev_info(&pdev->dev, "added ieee802154 hardware\n");
return 0;
err_slave:
list_for_each_entry(dp, &priv->list, list)
fakelb_del(dp);
err_alloc:
return err;
}
static int fakelb_remove(struct platform_device *pdev)
{
struct fakelb_priv *priv = platform_get_drvdata(pdev);
struct fakelb_dev_priv *dp, *temp;
list_for_each_entry_safe(dp, temp, &priv->list, list)
fakelb_del(dp);
return 0;
}
static struct platform_device *ieee802154fake_dev;
static struct platform_driver ieee802154fake_driver = {
.probe = fakelb_probe,
.remove = fakelb_remove,
.driver = {
.name = "ieee802154fakelb",
.owner = THIS_MODULE,
},
};
static __init int fakelb_init_module(void)
{
ieee802154fake_dev = platform_device_register_simple(
"ieee802154fakelb", -1, NULL, 0);
return platform_driver_register(&ieee802154fake_driver);
}
static __exit void fake_remove_module(void)
{
platform_driver_unregister(&ieee802154fake_driver);
platform_device_unregister(ieee802154fake_dev);
}
module_init(fakelb_init_module);
module_exit(fake_remove_module);
MODULE_LICENSE("GPL");