drivers/ieee802154: IEEE 802.15.4 loopback driver
authoralex.bluesman.smirnov@gmail.com <alex.bluesman.smirnov@gmail.com>
Tue, 15 May 2012 20:50:30 +0000 (20:50 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 16 May 2012 19:17:08 +0000 (15:17 -0400)
Add support for IEEE 802.15.4 loopback driver - useful development
and debugging tool.

Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/ieee802154/Kconfig
drivers/ieee802154/Makefile
drivers/ieee802154/fakelb.c [new file with mode: 0644]

index 9b9f43aa2f85a578ae01261c46e9a8bb1b9219b8..15c064073701fe4295b3ef4a6fab418cd5218621 100644 (file)
@@ -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'.
index 800a3894af0dd72190f5ad0e3bdadc32111219a3..ea784ea6f0f8242d76c0a10ee5529258241bcbbc 100644 (file)
@@ -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 (file)
index 0000000..e7456fc
--- /dev/null
@@ -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");