261 lines
6.2 KiB
C
261 lines
6.2 KiB
C
/*
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* Loopback IEEE 802.15.4 interface
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*
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* Copyright 2007-2012 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Written by:
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* Sergey Lapin <slapin@ossfans.org>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/platform_device.h>
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#include <linux/netdevice.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <net/mac802154.h>
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#include <net/cfg802154.h>
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static int numlbs = 2;
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static LIST_HEAD(fakelb_phys);
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static DEFINE_SPINLOCK(fakelb_phys_lock);
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static LIST_HEAD(fakelb_ifup_phys);
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static DEFINE_RWLOCK(fakelb_ifup_phys_lock);
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struct fakelb_phy {
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struct ieee802154_hw *hw;
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u8 page;
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u8 channel;
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bool suspended;
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struct list_head list;
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struct list_head list_ifup;
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};
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static int fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
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{
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BUG_ON(!level);
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*level = 0xbe;
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return 0;
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}
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static int fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
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{
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struct fakelb_phy *phy = hw->priv;
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write_lock_bh(&fakelb_ifup_phys_lock);
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phy->page = page;
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phy->channel = channel;
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write_unlock_bh(&fakelb_ifup_phys_lock);
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return 0;
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}
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static int fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
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{
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struct fakelb_phy *current_phy = hw->priv, *phy;
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read_lock_bh(&fakelb_ifup_phys_lock);
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WARN_ON(current_phy->suspended);
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list_for_each_entry(phy, &fakelb_ifup_phys, list_ifup) {
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if (current_phy == phy)
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continue;
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if (current_phy->page == phy->page &&
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current_phy->channel == phy->channel) {
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struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC);
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if (newskb)
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ieee802154_rx_irqsafe(phy->hw, newskb, 0xcc);
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}
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}
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read_unlock_bh(&fakelb_ifup_phys_lock);
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ieee802154_xmit_complete(hw, skb, false);
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return 0;
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}
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static int fakelb_hw_start(struct ieee802154_hw *hw)
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{
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struct fakelb_phy *phy = hw->priv;
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write_lock_bh(&fakelb_ifup_phys_lock);
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phy->suspended = false;
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list_add(&phy->list_ifup, &fakelb_ifup_phys);
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write_unlock_bh(&fakelb_ifup_phys_lock);
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return 0;
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}
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static void fakelb_hw_stop(struct ieee802154_hw *hw)
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{
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struct fakelb_phy *phy = hw->priv;
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write_lock_bh(&fakelb_ifup_phys_lock);
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phy->suspended = true;
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list_del(&phy->list_ifup);
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write_unlock_bh(&fakelb_ifup_phys_lock);
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}
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static const struct ieee802154_ops fakelb_ops = {
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.owner = THIS_MODULE,
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.xmit_async = fakelb_hw_xmit,
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.ed = fakelb_hw_ed,
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.set_channel = fakelb_hw_channel,
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.start = fakelb_hw_start,
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.stop = fakelb_hw_stop,
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};
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/* Number of dummy devices to be set up by this module. */
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module_param(numlbs, int, 0);
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MODULE_PARM_DESC(numlbs, " number of pseudo devices");
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static int fakelb_add_one(struct device *dev)
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{
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struct ieee802154_hw *hw;
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struct fakelb_phy *phy;
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int err;
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hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
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if (!hw)
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return -ENOMEM;
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phy = hw->priv;
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phy->hw = hw;
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/* 868 MHz BPSK 802.15.4-2003 */
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hw->phy->supported.channels[0] |= 1;
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/* 915 MHz BPSK 802.15.4-2003 */
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hw->phy->supported.channels[0] |= 0x7fe;
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/* 2.4 GHz O-QPSK 802.15.4-2003 */
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hw->phy->supported.channels[0] |= 0x7FFF800;
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/* 868 MHz ASK 802.15.4-2006 */
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hw->phy->supported.channels[1] |= 1;
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/* 915 MHz ASK 802.15.4-2006 */
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hw->phy->supported.channels[1] |= 0x7fe;
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/* 868 MHz O-QPSK 802.15.4-2006 */
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hw->phy->supported.channels[2] |= 1;
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/* 915 MHz O-QPSK 802.15.4-2006 */
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hw->phy->supported.channels[2] |= 0x7fe;
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/* 2.4 GHz CSS 802.15.4a-2007 */
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hw->phy->supported.channels[3] |= 0x3fff;
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/* UWB Sub-gigahertz 802.15.4a-2007 */
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hw->phy->supported.channels[4] |= 1;
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/* UWB Low band 802.15.4a-2007 */
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hw->phy->supported.channels[4] |= 0x1e;
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/* UWB High band 802.15.4a-2007 */
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hw->phy->supported.channels[4] |= 0xffe0;
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/* 750 MHz O-QPSK 802.15.4c-2009 */
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hw->phy->supported.channels[5] |= 0xf;
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/* 750 MHz MPSK 802.15.4c-2009 */
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hw->phy->supported.channels[5] |= 0xf0;
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/* 950 MHz BPSK 802.15.4d-2009 */
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hw->phy->supported.channels[6] |= 0x3ff;
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/* 950 MHz GFSK 802.15.4d-2009 */
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hw->phy->supported.channels[6] |= 0x3ffc00;
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ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
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/* fake phy channel 13 as default */
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hw->phy->current_channel = 13;
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phy->channel = hw->phy->current_channel;
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hw->parent = dev;
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err = ieee802154_register_hw(hw);
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if (err)
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goto err_reg;
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spin_lock(&fakelb_phys_lock);
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list_add_tail(&phy->list, &fakelb_phys);
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spin_unlock(&fakelb_phys_lock);
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return 0;
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err_reg:
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ieee802154_free_hw(phy->hw);
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return err;
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}
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static void fakelb_del(struct fakelb_phy *phy)
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{
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list_del(&phy->list);
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ieee802154_unregister_hw(phy->hw);
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ieee802154_free_hw(phy->hw);
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}
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static int fakelb_probe(struct platform_device *pdev)
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{
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struct fakelb_phy *phy, *tmp;
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int err, i;
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for (i = 0; i < numlbs; i++) {
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err = fakelb_add_one(&pdev->dev);
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if (err < 0)
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goto err_slave;
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}
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dev_info(&pdev->dev, "added ieee802154 hardware\n");
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return 0;
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err_slave:
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spin_lock(&fakelb_phys_lock);
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list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
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fakelb_del(phy);
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spin_unlock(&fakelb_phys_lock);
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return err;
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}
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static int fakelb_remove(struct platform_device *pdev)
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{
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struct fakelb_phy *phy, *tmp;
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spin_lock(&fakelb_phys_lock);
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list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
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fakelb_del(phy);
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spin_unlock(&fakelb_phys_lock);
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return 0;
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}
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static struct platform_device *ieee802154fake_dev;
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static struct platform_driver ieee802154fake_driver = {
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.probe = fakelb_probe,
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.remove = fakelb_remove,
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.driver = {
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.name = "ieee802154fakelb",
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},
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};
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static __init int fakelb_init_module(void)
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{
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ieee802154fake_dev = platform_device_register_simple(
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"ieee802154fakelb", -1, NULL, 0);
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return platform_driver_register(&ieee802154fake_driver);
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}
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static __exit void fake_remove_module(void)
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{
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platform_driver_unregister(&ieee802154fake_driver);
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platform_device_unregister(ieee802154fake_dev);
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}
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module_init(fakelb_init_module);
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module_exit(fake_remove_module);
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MODULE_LICENSE("GPL");
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