--- /dev/null
+/*
+ * 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);
+
+ 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",
+ },
+};
+
+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");
Code Review / kvmfornfv.git / blobdiff