.\"	$OpenBSD: acx.4,v 1.2 2006/08/03 19:35:20 deraadt Exp $
.\"
.\" Copyright (c) 2006 Theo de Raadt.
.\" Copyright (c) 2006 The DragonFly Project.  All rights reserved.
.\" 
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.\" 
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.\"    distribution.
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.\"    from this software without specific, prior written permission.
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.\"
.Dd March 24, 2006
.Os
.Dt ACX 4
.Sh NAME
.Nm acx
.Nd TI ACX100/ACX111 IEEE 802.11b/g adapters
.Sh SYNOPSIS
.Cd "acx* at cardbus?"
.Cd "acx* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides support for TI ACX100 or ACX111
based PCI/Cardbus network adapters.
.Pp
The ACX100A and ACX100B are the first generation 802.11b devices
from TI.
The ACX111 is the second generation device which supports 802.11b/g.
.Pp
These are the modes the
.Nm
driver can operate in:
.Bl -tag -width "IBSS-masterXX"
.It BSS mode
Also known as
.Em infrastructure
mode, this is used when associating with an access point, through
which all traffic passes.
This mode is the default.
.\" .It IBSS mode
.\" Also known as
.\" .Em IEEE ad-hoc
.\" mode or
.\" .Em peer-to-peer
.\" mode.
.\" This is the standardized method of operating without an access point.
.\" Stations associate with a service set.
.\" However, actual connections between stations are peer-to-peer.
.\" .It Host AP
.\" In this mode the driver acts as an access point (base station)
.\" for other cards.
.\" .It monitor mode
.\" In this mode the driver is able to receive packets without
.\" associating with an access point.
.\" This disables the internal receive filter and enables the card to
.\" capture packets from networks which it wouldn't normally have access to,
.\" or to scan for access points.
.El
.Pp
.Nm
supports software WEP.
Wired Equivalent Privacy (WEP) is the de facto encryption standard
for wireless networks.
It can be typically configured in one of three modes:
no encryption; 40-bit encryption; or 104-bit encryption.
Unfortunately, due to serious weaknesses in WEP protocol
it is strongly recommended that it not be used as the
sole mechanism to secure wireless communication.
WEP is not enabled by default.
.Pp
The transmit speed is user-selectable or can be adapted automatically by the
driver depending on the received signal strength and on the number of hardware
transmission retries.
See
.Xr rssadapt 9
for more information.
.Sh CONFIGURATION
The
.Nm
driver can be configured at runtime with
.Xr ifconfig 8
or on boot with
.Xr hostname.if 5
using the following parameters:
.Bl -tag -width Ds
.It Cm bssid Ar bssid
Set the desired BSSID.
.It Fl bssid
Unset the desired BSSID.
The interface will automatically select a BSSID in this mode, which is
the default.
.It Cm chan Ar n
Set the channel (radio frequency) to be used by the driver based on
the given channel ID
.Ar n .
.It Fl chan
Unset the desired channel to be used by the driver.
The driver will automatically select a channel in this mode, which is
the default.
.It Cm media Ar media
The
.Nm
driver supports the following
.Ar media
types:
.Pp
.Bl -tag -width autoselect -compact
.It Cm autoselect
Enable autoselection of the media type and options.
.It Cm DS1
Set 802.11b DS 1Mbps operation.
.It Cm DS2
Set 802.11b DS 2Mbps operation.
.It Cm DS5
Set 802.11b DS 5.5Mbps operation.
.It Cm DS11
Set 802.11b DS 11Mbps operation.
.It Cm OFDM6
Set 802.11a/g OFDM 6Mbps operation.
.It Cm OFDM9
Set 802.11a/g OFDM 9Mbps operation.
.It Cm OFDM12
Set 802.11a/g OFDM 12Mbps operation.
.It Cm OFDM18
Set 802.11a/g OFDM 18Mbps operation.
.It Cm OFDM24
Set 802.11a/g OFDM 24Mbps operation.
.It Cm OFDM36
Set 802.11a/g OFDM 36Mbps operation.
.It Cm OFDM48
Set 802.11a/g OFDM 48Mbps operation.
.It Cm OFDM54
Set 802.11a/g OFDM 54Mbps operation.
.El
.It Cm mediaopt Ar opts
The
.Nm
driver supports the following media options:
.Pp
.Bl -tag -width monitor -compact
.It Cm hostap
Select Host AP operation.
.It Cm ibss
Select IBSS operation.
.It Cm monitor
Select monitor mode.
.El
.It Fl mediaopt Ar opts
Disable the specified media options on the driver and return it to the
default mode of operation (BSS).
.It Cm mode Ar mode
The
.Nm
driver supports the following modes:
.Pp
.Bl -tag -width 11b -compact
.It Cm 11a
Force 802.11a operation.
.It Cm 11b
Force 802.11b operation.
.It Cm 11g
Force 802.11g operation.
.El
.It Cm nwid Ar id
Set the network ID.
The
.Ar id
can either be any text string up to 32 characters in length,
or a series of hexadecimal digits up to 64 digits.
An empty
.Ar id
string allows the interface to connect to any available access points.
By default the
.Nm
driver uses an empty string.
Note that network ID is synonymous with Extended Service Set ID (ESSID).
.It Cm nwkey Ar key
Enable WEP encryption using the specified
.Ar key .
The
.Ar key
can either be a string, a series of hexadecimal digits (preceded by
.Sq 0x ) ,
or a set of keys of the form
.Dq n:k1,k2,k3,k4 ,
where
.Sq n
specifies which of the keys will be used for transmitted packets,
and the four keys,
.Dq k1
through
.Dq k4 ,
are configured as WEP keys.
If a set of keys is specified, a comma
.Pq Sq \&,
within the key must be escaped with a backslash.
Note that if multiple keys are used, their order must be the same within
the network.
.Nm
is capable of using both 40-bit (5 characters or 10 hexadecimal digits)
or 104-bit (13 characters or 26 hexadecimal digits) keys.
.It Fl nwkey
Disable WEP encryption.
This is the default mode of operation.
.El
.Pp
.Sh FILES
The driver needs a set of firmware files which are loaded when
an interface is brought up:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It Pa /etc/firmware/tiacx100
.It Pa /etc/firmware/tiacx100e0D
.It Pa /etc/firmware/tiacx100r11
.It Pa /etc/firmware/tiacx111
.El
.Pp
This firmware files are not free because TI refuses
to grant distribution rights, in fact, they have rebuffed thousands
of attempts to start a dialogue on this issue.
As a result, even though
.Ox
includes the driver, the firmware file cannot be included and
users have to download this file on their own.
.Pp
A prepackaged version of the firmware, designed to be used with
.Xr pkg_add 1 ,
can be found at:
.Pp
.Pa http://damien.bergamini.free.fr/packages/openbsd/acx-firmware-1.0.tgz
.Sh HARDWARE
The following Cardbus ACX100 cards are known to work:
.Pp
.Bd -filled
D-Link DWL-650+,
Engenic ERG WL-003
.Ed
.Pp
The following Cardbus ACX111 cards are known to work:
.Pp
.Bd -filled
D-Link DWL-G630+,
D-Link DWL-G650+,
Hamlet HNWP254,
Linksys WPC54Gv2,
Zyxel G-160,
USR USR5410,
Microcom Travelcard WiFi 11g
.Ed
.Pp
The following PCI ACX100 cards are known to work:
.Pp
.Bd -filled
D-Link DWL-520+
.Ed
.Pp
The following PCI ACX111 cards are known to work:
.Pp
.Bd -filled
D-Link DWL-G520+,
Hawking HWP54G,
Netgear WG311v2,
Tornado/ADT 211g,
USR USR5416,
Zyxel G-360 EE
.Ed
.Sh SEE ALSO
.Xr arp 4 ,
.Xr cardbus 4 ,
.Xr pci 4 ,
.Xr ifmedia 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr hostname.if 5 ,
.Xr hostapd 8 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 4.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Sepherosa Ziehau .
The manual page was written by
.An Sascha Wildner .
Both are based on the
.Pa http://wlan.kewl.org
project team's original code.
.Pp
The hardware specification was reverse engineered by the good folks at
.Pa http://acx100.sourceforge.net .
Without them this driver would not have been possible.