ieee802154: add simple HardMAC driver sample

fakehard is a really simple driver implementing only necessary
callbacks and serves the role of an example of driver for HardMAC
IEEE 802.15.4 device.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Sergey Lapin <slapin@ossfans.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 295 insertions, 0 deletions

diff --git a/drivers/ieee802154/Kconfig b/drivers/ieee802154/Kconfig
new file mode 100644
index 000000000000..25740bd54975
--- /dev/null
+++ b/drivers/ieee802154/Kconfig
@@ -0,0 +1,22 @@
+menuconfig IEEE802154_DRIVERS
+        bool "IEEE 802.15.4 drivers"
+        depends on NETDEVICES && IEEE802154
+        default y
+        ---help---
+          Say Y here to get to see options for IEEE 802.15.4 Low-Rate
+          Wireless Personal Area Network device drivers. This option alone
+          does not add any kernel code.
+
+          If you say N, all options in this submenu will be skipped and
+          disabled.
+
+config IEEE802154_FAKEHARD
+        tristate "Fake LR-WPAN driver with several interconnected devices"
+        depends on  IEEE802154_DRIVERS
+        ---help---
+          Say Y here to enable the fake driver that serves as an example
+          of HardMAC device driver.
+
+          This driver can also be built as a module. To do so say M here.
+          The module will be called 'fakehard'.
+
diff --git a/drivers/ieee802154/Makefile b/drivers/ieee802154/Makefile
new file mode 100644
index 000000000000..e0e8e1a184ff
--- /dev/null
+++ b/drivers/ieee802154/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_IEEE802154_FAKEHARD) += fakehard.o
+
+EXTRA_CFLAGS += -DDEBUG -DCONFIG_FFD
diff --git a/drivers/ieee802154/fakehard.c b/drivers/ieee802154/fakehard.c
new file mode 100644
index 000000000000..0384144c0b34
--- /dev/null
+++ b/drivers/ieee802154/fakehard.c
@@ -0,0 +1,270 @@
+/*
+ * Sample driver for HardMAC IEEE 802.15.4 devices
+ *
+ * Copyright (C) 2009 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:
+ * Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+
+#include <net/ieee802154/af_ieee802154.h>
+#include <net/ieee802154/netdevice.h>
+#include <net/ieee802154/mac_def.h>
+#include <net/ieee802154/nl802154.h>
+
+static u16 fake_get_pan_id(struct net_device *dev)
+{
+        BUG_ON(dev->type != ARPHRD_IEEE802154);
+
+        return 0xeba1;
+}
+
+static u16 fake_get_short_addr(struct net_device *dev)
+{
+        BUG_ON(dev->type != ARPHRD_IEEE802154);
+
+        return 0x1;
+}
+
+static u8 fake_get_dsn(struct net_device *dev)
+{
+        BUG_ON(dev->type != ARPHRD_IEEE802154);
+
+        return 0x00; /* DSN are implemented in HW, so return just 0 */
+}
+
+static u8 fake_get_bsn(struct net_device *dev)
+{
+        BUG_ON(dev->type != ARPHRD_IEEE802154);
+
+        return 0x00; /* BSN are implemented in HW, so return just 0 */
+}
+
+static int fake_assoc_req(struct net_device *dev,
+                struct ieee802154_addr *addr, u8 channel, u8 cap)
+{
+        /* We simply emulate it here */
+        return ieee802154_nl_assoc_confirm(dev, fake_get_short_addr(dev),
+                        IEEE802154_SUCCESS);
+}
+
+static int fake_assoc_resp(struct net_device *dev,
+                struct ieee802154_addr *addr, u16 short_addr, u8 status)
+{
+        return 0;
+}
+
+static int fake_disassoc_req(struct net_device *dev,
+                struct ieee802154_addr *addr, u8 reason)
+{
+        return ieee802154_nl_disassoc_confirm(dev, IEEE802154_SUCCESS);
+}
+
+static int fake_start_req(struct net_device *dev, struct ieee802154_addr *addr,
+                                u8 channel,
+                                u8 bcn_ord, u8 sf_ord, u8 pan_coord, u8 blx,
+                                u8 coord_realign)
+{
+        return 0;
+}
+
+static int fake_scan_req(struct net_device *dev, u8 type, u32 channels,
+                u8 duration)
+{
+        u8 edl[27] = {};
+        return ieee802154_nl_scan_confirm(dev, IEEE802154_SUCCESS, type,
+                        channels,
+                        type == IEEE802154_MAC_SCAN_ED ? edl : NULL);
+}
+
+static struct ieee802154_mlme_ops fake_mlme = {
+        .assoc_req = fake_assoc_req,
+        .assoc_resp = fake_assoc_resp,
+        .disassoc_req = fake_disassoc_req,
+        .start_req = fake_start_req,
+        .scan_req = fake_scan_req,
+
+        .get_pan_id = fake_get_pan_id,
+        .get_short_addr = fake_get_short_addr,
+        .get_dsn = fake_get_dsn,
+        .get_bsn = fake_get_bsn,
+};
+
+static int ieee802154_fake_open(struct net_device *dev)
+{
+        netif_start_queue(dev);
+        return 0;
+}
+
+static int ieee802154_fake_close(struct net_device *dev)
+{
+        netif_stop_queue(dev);
+        return 0;
+}
+
+static int ieee802154_fake_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        skb->iif = dev->ifindex;
+        skb->dev = dev;
+        dev->stats.tx_packets++;
+        dev->stats.tx_bytes += skb->len;
+
+        dev->trans_start = jiffies;
+
+        /* FIXME: do hardware work here ... */
+
+        return 0;
+}
+
+
+static int ieee802154_fake_ioctl(struct net_device *dev, struct ifreq *ifr,
+                int cmd)
+{
+        struct sockaddr_ieee802154 *sa =
+                (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
+        u16 pan_id, short_addr;
+
+        switch (cmd) {
+        case SIOCGIFADDR:
+                /* FIXME: fixed here, get from device IRL */
+                pan_id = fake_get_pan_id(dev);
+                short_addr = fake_get_short_addr(dev);
+                if (pan_id == IEEE802154_PANID_BROADCAST ||
+                    short_addr == IEEE802154_ADDR_BROADCAST)
+                        return -EADDRNOTAVAIL;
+
+                sa->family = AF_IEEE802154;
+                sa->addr.addr_type = IEEE802154_ADDR_SHORT;
+                sa->addr.pan_id = pan_id;
+                sa->addr.short_addr = short_addr;
+                return 0;
+        }
+        return -ENOIOCTLCMD;
+}
+
+static int ieee802154_fake_mac_addr(struct net_device *dev, void *p)
+{
+        return -EBUSY; /* HW address is built into the device */
+}
+
+static const struct net_device_ops fake_ops = {
+        .ndo_open               = ieee802154_fake_open,
+        .ndo_stop               = ieee802154_fake_close,
+        .ndo_start_xmit         = ieee802154_fake_xmit,
+        .ndo_do_ioctl           = ieee802154_fake_ioctl,
+        .ndo_set_mac_address    = ieee802154_fake_mac_addr,
+};
+
+
+static void ieee802154_fake_setup(struct net_device *dev)
+{
+        dev->addr_len           = IEEE802154_ADDR_LEN;
+        memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
+        dev->features           = NETIF_F_NO_CSUM;
+        dev->needed_tailroom    = 2; /* FCS */
+        dev->mtu                = 127;
+        dev->tx_queue_len       = 10;
+        dev->type               = ARPHRD_IEEE802154;
+        dev->flags              = IFF_NOARP | IFF_BROADCAST;
+        dev->watchdog_timeo     = 0;
+}
+
+
+static int __devinit ieee802154fake_probe(struct platform_device *pdev)
+{
+        struct net_device *dev =
+                alloc_netdev(0, "hardwpan%d", ieee802154_fake_setup);
+        int err;
+
+        if (!dev)
+                return -ENOMEM;
+
+        memcpy(dev->dev_addr, "\xba\xbe\xca\xfe\xde\xad\xbe\xef",
+                        dev->addr_len);
+        memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
+
+        dev->netdev_ops = &fake_ops;
+        dev->ml_priv = &fake_mlme;
+
+        /*
+         * If the name is a format string the caller wants us to do a
+         * name allocation.
+         */
+        if (strchr(dev->name, '%')) {
+                err = dev_alloc_name(dev, dev->name);
+                if (err < 0)
+                        goto out;
+        }
+
+        SET_NETDEV_DEV(dev, &pdev->dev);
+
+        platform_set_drvdata(pdev, dev);
+
+        err = register_netdev(dev);
+        if (err < 0)
+                goto out;
+
+
+        dev_info(&pdev->dev, "Added ieee802154 HardMAC hardware\n");
+        return 0;
+
+out:
+        unregister_netdev(dev);
+        return err;
+}
+
+static int __devexit ieee802154fake_remove(struct platform_device *pdev)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        unregister_netdev(dev);
+        free_netdev(dev);
+        return 0;
+}
+
+static struct platform_device *ieee802154fake_dev;
+
+static struct platform_driver ieee802154fake_driver = {
+        .probe = ieee802154fake_probe,
+        .remove = __devexit_p(ieee802154fake_remove),
+        .driver = {
+                        .name = "ieee802154hardmac",
+                        .owner = THIS_MODULE,
+        },
+};
+
+static __init int fake_init(void)
+{
+        ieee802154fake_dev = platform_device_register_simple(
+                        "ieee802154hardmac", -1, NULL, 0);
+        return platform_driver_register(&ieee802154fake_driver);
+}
+
+static __exit void fake_exit(void)
+{
+        platform_driver_unregister(&ieee802154fake_driver);
+        platform_device_unregister(ieee802154fake_dev);
+}
+
+module_init(fake_init);
+module_exit(fake_exit);
+MODULE_LICENSE("GPL");
+