427 lines
12 KiB
C
427 lines
12 KiB
C
/*
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* Sample driver for HardMAC IEEE 802.15.4 devices
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*
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* Copyright (C) 2009 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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <net/af_ieee802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/ieee802154.h>
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#include <net/nl802154.h>
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#include <net/wpan-phy.h>
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struct wpan_phy *net_to_phy(struct net_device *dev)
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{
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return container_of(dev->dev.parent, struct wpan_phy, dev);
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}
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/**
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* fake_get_pan_id - Retrieve the PAN ID of the device.
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* @dev: The network device to retrieve the PAN of.
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*
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* Return the ID of the PAN from the PIB.
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*/
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static u16 fake_get_pan_id(struct net_device *dev)
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{
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BUG_ON(dev->type != ARPHRD_IEEE802154);
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return 0xeba1;
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}
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/**
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* fake_get_short_addr - Retrieve the short address of the device.
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* @dev: The network device to retrieve the short address of.
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*
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* Returns the IEEE 802.15.4 short-form address cached for this
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* device. If the device has not yet had a short address assigned
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* then this should return 0xFFFF to indicate a lack of association.
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*/
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static u16 fake_get_short_addr(struct net_device *dev)
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{
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BUG_ON(dev->type != ARPHRD_IEEE802154);
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return 0x1;
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}
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/**
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* fake_get_dsn - Retrieve the DSN of the device.
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* @dev: The network device to retrieve the DSN for.
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*
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* Returns the IEEE 802.15.4 DSN for the network device.
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* The DSN is the sequence number which will be added to each
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* packet or MAC command frame by the MAC during transmission.
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*
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* DSN means 'Data Sequence Number'.
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*
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* Note: This is in section 7.2.1.2 of the IEEE 802.15.4-2006
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* document.
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*/
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static u8 fake_get_dsn(struct net_device *dev)
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{
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BUG_ON(dev->type != ARPHRD_IEEE802154);
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return 0x00; /* DSN are implemented in HW, so return just 0 */
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}
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/**
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* fake_get_bsn - Retrieve the BSN of the device.
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* @dev: The network device to retrieve the BSN for.
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*
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* Returns the IEEE 802.15.4 BSN for the network device.
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* The BSN is the sequence number which will be added to each
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* beacon frame sent by the MAC.
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*
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* BSN means 'Beacon Sequence Number'.
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*
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* Note: This is in section 7.2.1.2 of the IEEE 802.15.4-2006
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* document.
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*/
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static u8 fake_get_bsn(struct net_device *dev)
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{
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BUG_ON(dev->type != ARPHRD_IEEE802154);
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return 0x00; /* BSN are implemented in HW, so return just 0 */
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}
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/**
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* fake_assoc_req - Make an association request to the HW.
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* @dev: The network device which we are associating to a network.
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* @addr: The coordinator with which we wish to associate.
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* @channel: The channel on which to associate.
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* @cap: The capability information field to use in the association.
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*
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* Start an association with a coordinator. The coordinator's address
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* and PAN ID can be found in @addr.
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*
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* Note: This is in section 7.3.1 and 7.5.3.1 of the IEEE
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* 802.15.4-2006 document.
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*/
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static int fake_assoc_req(struct net_device *dev,
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struct ieee802154_addr *addr, u8 channel, u8 page, u8 cap)
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{
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struct wpan_phy *phy = net_to_phy(dev);
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mutex_lock(&phy->pib_lock);
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phy->current_channel = channel;
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phy->current_page = page;
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mutex_unlock(&phy->pib_lock);
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/* We simply emulate it here */
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return ieee802154_nl_assoc_confirm(dev, fake_get_short_addr(dev),
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IEEE802154_SUCCESS);
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}
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/**
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* fake_assoc_resp - Send an association response to a device.
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* @dev: The network device on which to send the response.
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* @addr: The address of the device to respond to.
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* @short_addr: The assigned short address for the device (if any).
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* @status: The result of the association request.
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*
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* Queue the association response of the coordinator to another
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* device's attempt to associate with the network which we
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* coordinate. This is then added to the indirect-send queue to be
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* transmitted to the end device when it polls for data.
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*
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* Note: This is in section 7.3.2 and 7.5.3.1 of the IEEE
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* 802.15.4-2006 document.
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*/
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static int fake_assoc_resp(struct net_device *dev,
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struct ieee802154_addr *addr, u16 short_addr, u8 status)
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{
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return 0;
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}
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/**
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* fake_disassoc_req - Disassociate a device from a network.
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* @dev: The network device on which we're disassociating a device.
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* @addr: The device to disassociate from the network.
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* @reason: The reason to give to the device for being disassociated.
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*
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* This sends a disassociation notification to the device being
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* disassociated from the network.
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*
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* Note: This is in section 7.5.3.2 of the IEEE 802.15.4-2006
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* document, with the reason described in 7.3.3.2.
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*/
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static int fake_disassoc_req(struct net_device *dev,
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struct ieee802154_addr *addr, u8 reason)
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{
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return ieee802154_nl_disassoc_confirm(dev, IEEE802154_SUCCESS);
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}
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/**
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* fake_start_req - Start an IEEE 802.15.4 PAN.
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* @dev: The network device on which to start the PAN.
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* @addr: The coordinator address to use when starting the PAN.
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* @channel: The channel on which to start the PAN.
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* @bcn_ord: Beacon order.
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* @sf_ord: Superframe order.
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* @pan_coord: Whether or not we are the PAN coordinator or just
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* requesting a realignment perhaps?
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* @blx: Battery Life Extension feature bitfield.
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* @coord_realign: Something to realign something else.
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*
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* If pan_coord is non-zero then this starts a network with the
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* provided parameters, otherwise it attempts a coordinator
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* realignment of the stated network instead.
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*
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* Note: This is in section 7.5.2.3 of the IEEE 802.15.4-2006
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* document, with 7.3.8 describing coordinator realignment.
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*/
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static int fake_start_req(struct net_device *dev, struct ieee802154_addr *addr,
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u8 channel, u8 page,
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u8 bcn_ord, u8 sf_ord, u8 pan_coord, u8 blx,
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u8 coord_realign)
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{
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struct wpan_phy *phy = net_to_phy(dev);
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mutex_lock(&phy->pib_lock);
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phy->current_channel = channel;
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phy->current_page = page;
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mutex_unlock(&phy->pib_lock);
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/* We don't emulate beacons here at all, so START should fail */
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ieee802154_nl_start_confirm(dev, IEEE802154_INVALID_PARAMETER);
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return 0;
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}
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/**
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* fake_scan_req - Start a channel scan.
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* @dev: The network device on which to perform a channel scan.
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* @type: The type of scan to perform.
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* @channels: The channel bitmask to scan.
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* @duration: How long to spend on each channel.
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*
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* This starts either a passive (energy) scan or an active (PAN) scan
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* on the channels indicated in the @channels bitmask. The duration of
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* the scan is measured in terms of superframe duration. Specifically,
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* the scan will spend aBaseSuperFrameDuration * ((2^n) + 1) on each
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* channel.
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*
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* Note: This is in section 7.5.2.1 of the IEEE 802.15.4-2006 document.
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*/
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static int fake_scan_req(struct net_device *dev, u8 type, u32 channels,
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u8 page, u8 duration)
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{
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u8 edl[27] = {};
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return ieee802154_nl_scan_confirm(dev, IEEE802154_SUCCESS, type,
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channels, page,
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type == IEEE802154_MAC_SCAN_ED ? edl : NULL);
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}
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static struct ieee802154_mlme_ops fake_mlme = {
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.assoc_req = fake_assoc_req,
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.assoc_resp = fake_assoc_resp,
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.disassoc_req = fake_disassoc_req,
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.start_req = fake_start_req,
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.scan_req = fake_scan_req,
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.get_pan_id = fake_get_pan_id,
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.get_short_addr = fake_get_short_addr,
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.get_dsn = fake_get_dsn,
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.get_bsn = fake_get_bsn,
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};
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static int ieee802154_fake_open(struct net_device *dev)
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{
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netif_start_queue(dev);
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return 0;
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}
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static int ieee802154_fake_close(struct net_device *dev)
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{
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netif_stop_queue(dev);
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return 0;
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}
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static netdev_tx_t ieee802154_fake_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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/* FIXME: do hardware work here ... */
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static int ieee802154_fake_ioctl(struct net_device *dev, struct ifreq *ifr,
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int cmd)
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{
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struct sockaddr_ieee802154 *sa =
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(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
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u16 pan_id, short_addr;
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switch (cmd) {
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case SIOCGIFADDR:
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/* FIXME: fixed here, get from device IRL */
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pan_id = fake_get_pan_id(dev);
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short_addr = fake_get_short_addr(dev);
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if (pan_id == IEEE802154_PANID_BROADCAST ||
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short_addr == IEEE802154_ADDR_BROADCAST)
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return -EADDRNOTAVAIL;
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sa->family = AF_IEEE802154;
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sa->addr.addr_type = IEEE802154_ADDR_SHORT;
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sa->addr.pan_id = pan_id;
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sa->addr.short_addr = short_addr;
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return 0;
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}
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return -ENOIOCTLCMD;
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}
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static int ieee802154_fake_mac_addr(struct net_device *dev, void *p)
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{
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return -EBUSY; /* HW address is built into the device */
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}
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static const struct net_device_ops fake_ops = {
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.ndo_open = ieee802154_fake_open,
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.ndo_stop = ieee802154_fake_close,
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.ndo_start_xmit = ieee802154_fake_xmit,
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.ndo_do_ioctl = ieee802154_fake_ioctl,
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.ndo_set_mac_address = ieee802154_fake_mac_addr,
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};
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static void ieee802154_fake_destruct(struct net_device *dev)
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{
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struct wpan_phy *phy = net_to_phy(dev);
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wpan_phy_unregister(phy);
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free_netdev(dev);
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wpan_phy_free(phy);
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}
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static void ieee802154_fake_setup(struct net_device *dev)
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{
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dev->addr_len = IEEE802154_ADDR_LEN;
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memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
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dev->features = NETIF_F_NO_CSUM;
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dev->needed_tailroom = 2; /* FCS */
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dev->mtu = 127;
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dev->tx_queue_len = 10;
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dev->type = ARPHRD_IEEE802154;
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dev->flags = IFF_NOARP | IFF_BROADCAST;
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dev->watchdog_timeo = 0;
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dev->destructor = ieee802154_fake_destruct;
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}
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static int __devinit ieee802154fake_probe(struct platform_device *pdev)
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{
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struct net_device *dev;
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struct wpan_phy *phy = wpan_phy_alloc(0);
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int err;
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if (!phy)
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return -ENOMEM;
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dev = alloc_netdev(0, "hardwpan%d", ieee802154_fake_setup);
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if (!dev) {
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wpan_phy_free(phy);
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return -ENOMEM;
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}
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phy->dev.platform_data = dev;
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memcpy(dev->dev_addr, "\xba\xbe\xca\xfe\xde\xad\xbe\xef",
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dev->addr_len);
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memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
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phy->channels_supported = (1 << 27) - 1;
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phy->transmit_power = 0xbf;
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dev->netdev_ops = &fake_ops;
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dev->ml_priv = &fake_mlme;
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/*
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* If the name is a format string the caller wants us to do a
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* name allocation.
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*/
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if (strchr(dev->name, '%')) {
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err = dev_alloc_name(dev, dev->name);
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if (err < 0)
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goto out;
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}
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SET_NETDEV_DEV(dev, &phy->dev);
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platform_set_drvdata(pdev, dev);
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err = wpan_phy_register(&pdev->dev, phy);
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if (err)
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goto out;
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err = register_netdev(dev);
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if (err < 0)
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goto out;
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dev_info(&pdev->dev, "Added ieee802154 HardMAC hardware\n");
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return 0;
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out:
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unregister_netdev(dev);
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return err;
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}
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static int __devexit ieee802154fake_remove(struct platform_device *pdev)
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{
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struct net_device *dev = platform_get_drvdata(pdev);
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unregister_netdev(dev);
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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 = ieee802154fake_probe,
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.remove = __devexit_p(ieee802154fake_remove),
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.driver = {
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.name = "ieee802154hardmac",
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.owner = THIS_MODULE,
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},
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};
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static __init int fake_init(void)
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{
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ieee802154fake_dev = platform_device_register_simple(
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"ieee802154hardmac", -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_exit(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(fake_init);
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module_exit(fake_exit);
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MODULE_LICENSE("GPL");
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