3 files changed, 303 insertions, 0 deletions

diff --git a/drivers/ieee802154/Kconfig b/drivers/ieee802154/Kconfig
index 9b9f43aa2f85..15c064073701 100644
--- a/drivers/ieee802154/Kconfig
+++ b/drivers/ieee802154/Kconfig
@@ -19,4 +19,12 @@ config IEEE802154_FAKEHARD
 
           This driver can also be built as a module. To do so say M here.
           The module will be called 'fakehard'.
+config IEEE802154_FAKELB
+        depends on IEEE802154_DRIVERS && MAC802154
+        tristate "IEEE 802.15.4 loopback driver"
+        ---help---
+          Say Y here to enable the fake driver that can emulate a net
+          of several interconnected radio devices.
 
+          This driver can also be built as a module. To do so say M here.
+          The module will be called 'fakelb'.
diff --git a/drivers/ieee802154/Makefile b/drivers/ieee802154/Makefile
index 800a3894af0d..ea784ea6f0f8 100644
--- a/drivers/ieee802154/Makefile
+++ b/drivers/ieee802154/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_IEEE802154_FAKEHARD) += fakehard.o
+obj-$(CONFIG_IEEE802154_FAKELB) += fakelb.o
diff --git a/drivers/ieee802154/fakelb.c b/drivers/ieee802154/fakelb.c
new file mode 100644
index 000000000000..e7456fcd0913
--- /dev/null
+++ b/drivers/ieee802154/fakelb.c
@@ -0,0 +1,294 @@
+/*
+ * 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.
+ *
+ * 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:
+ * 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/spinlock.h>
+#include <net/mac802154.h>
+#include <net/wpan-phy.h>
+
+static int numlbs = 1;
+
+struct fakelb_dev_priv {
+        struct ieee802154_dev *dev;
+
+        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_dev *dev, u8 *level)
+{
+        might_sleep();
+        BUG_ON(!level);
+        *level = 0xbe;
+
+        return 0;
+}
+
+static int
+fakelb_hw_channel(struct ieee802154_dev *dev, int page, int channel)
+{
+        pr_debug("set channel to %d\n", channel);
+
+        might_sleep();
+        dev->phy->current_page = page;
+        dev->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->dev, newskb, 0xcc);
+        }
+        spin_unlock(&priv->lock);
+}
+
+static int
+fakelb_hw_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
+{
+        struct fakelb_dev_priv *priv = dev->priv;
+        struct fakelb_priv *fake = priv->fake;
+
+        might_sleep();
+
+        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->dev->phy->current_channel ==
+                             priv->dev->phy->current_channel))
+                                fakelb_hw_deliver(dp, skb);
+                }
+        }
+        read_unlock_bh(&fake->lock);
+
+        return 0;
+}
+
+static int
+fakelb_hw_start(struct ieee802154_dev *dev) {
+        struct fakelb_dev_priv *priv = dev->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_dev *dev) {
+        struct fakelb_dev_priv *priv = dev->priv;
+
+        spin_lock(&priv->lock);
+        priv->working = 0;
+        spin_unlock(&priv->lock);
+}
+
+static struct ieee802154_ops fakelb_ops = {
+        .owner = THIS_MODULE,
+        .xmit = 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_dev *ieee;
+
+        ieee = ieee802154_alloc_device(sizeof(*priv), &fakelb_ops);
+        if (!ieee)
+                return -ENOMEM;
+
+        priv = ieee->priv;
+        priv->dev = ieee;
+
+        /* 868 MHz BPSK 802.15.4-2003 */
+        ieee->phy->channels_supported[0] |= 1;
+        /* 915 MHz BPSK 802.15.4-2003 */
+        ieee->phy->channels_supported[0] |= 0x7fe;
+        /* 2.4 GHz O-QPSK 802.15.4-2003 */
+        ieee->phy->channels_supported[0] |= 0x7FFF800;
+        /* 868 MHz ASK 802.15.4-2006 */
+        ieee->phy->channels_supported[1] |= 1;
+        /* 915 MHz ASK 802.15.4-2006 */
+        ieee->phy->channels_supported[1] |= 0x7fe;
+        /* 868 MHz O-QPSK 802.15.4-2006 */
+        ieee->phy->channels_supported[2] |= 1;
+        /* 915 MHz O-QPSK 802.15.4-2006 */
+        ieee->phy->channels_supported[2] |= 0x7fe;
+        /* 2.4 GHz CSS 802.15.4a-2007 */
+        ieee->phy->channels_supported[3] |= 0x3fff;
+        /* UWB Sub-gigahertz 802.15.4a-2007 */
+        ieee->phy->channels_supported[4] |= 1;
+        /* UWB Low band 802.15.4a-2007 */
+        ieee->phy->channels_supported[4] |= 0x1e;
+        /* UWB High band 802.15.4a-2007 */
+        ieee->phy->channels_supported[4] |= 0xffe0;
+        /* 750 MHz O-QPSK 802.15.4c-2009 */
+        ieee->phy->channels_supported[5] |= 0xf;
+        /* 750 MHz MPSK 802.15.4c-2009 */
+        ieee->phy->channels_supported[5] |= 0xf0;
+        /* 950 MHz BPSK 802.15.4d-2009 */
+        ieee->phy->channels_supported[6] |= 0x3ff;
+        /* 950 MHz GFSK 802.15.4d-2009 */
+        ieee->phy->channels_supported[6] |= 0x3ffc00;
+
+        INIT_LIST_HEAD(&priv->list);
+        priv->fake = fake;
+
+        spin_lock_init(&priv->lock);
+
+        ieee->parent = dev;
+
+        err = ieee802154_register_device(ieee);
+        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_device(priv->dev);
+        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_device(priv->dev);
+        ieee802154_free_device(priv->dev);
+}
+
+static int __devinit fakelb_probe(struct platform_device *pdev)
+{
+        struct fakelb_priv *priv;
+        struct fakelb_dev_priv *dp;
+        int err = -ENOMEM;
+        int i;
+
+        priv = kzalloc(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);
+        kfree(priv);
+err_alloc:
+        return err;
+}
+
+static int __devexit 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);
+        kfree(priv);
+
+        return 0;
+}
+
+static struct platform_device *ieee802154fake_dev;
+
+static struct platform_driver ieee802154fake_driver = {
+        .probe = fakelb_probe,
+        .remove = __devexit_p(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");