1.\" $NetBSD: atw.4,v 1.12 2010/01/15 19:24:49 joerg Exp $ 2.\" 3.\" Copyright (c) 2003 4.\" David Young <dyoung@NetBSD.org>. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY David Young AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL David Young 19.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 25.\" THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $Id: atw.4,v 1.12 2010/01/15 19:24:49 joerg Exp $ 28.\" 29.Dd June 5, 2004 30.Dt ATW 4 31.Os 32.Sh NAME 33.Nm atw 34.Nd ADMtek ADM8211 802.11 wireless network driver 35.Sh SYNOPSIS 36.Cd "atw* at cardbus? function ?" 37.Cd "atw* at pci? dev ? function ?" 38.Sh DESCRIPTION 39The 40.Nm 41driver supports PCI/CardBus 802.11b wireless adapters based on the 42ADMtek ADM8211. 43.Pp 44The ADM8211 is a bus-mastering 802.11 Media Access Controller (MAC) 45which is derived from ADMtek's Tulip clones (see 46.Xr tlp 4 ) . 47It supports contention-free traffic (with an 802.11 Point Coordinator), 4864/128-bit WEP encryption, and 802.11 power-saving. 49The ADM8211 integrates an RF3000 baseband processor (BBP) by RF 50Microdevices. 51.Pp 52In a typical application, the ADM8211 is coupled with an RF front-end 53by RFMD and a Silicon Laboratories Si4126 RF/IF synthesizer. 54.Pp 55With the ADM8211, the division of labor between the host and NIC 56is different than with firmware-based NICs such as 57.Xr an 4 , 58.Xr awi 4 , 59and 60.Xr wi 4 . 61The ADM8211 is still responsible for real-time 802.11 functions 62such as sending ACK/RTS/CTS/ATIM frames, sending beacons, and 63answering CF polls from the access point, but the host takes 64responsibility for providing 802.11 functions such as scanning, 65association, and authentication. 66The host is also responsible for programming both the BBP and the 67RF/IF synthesizer. 68.Pp 69.Nm 70contains incomplete support for the ADM8211's WEP encryption/decryption 71engine. 72.Nm 73does not yet support hardware WEP decryption, however, it will use 74the ADM8211's crypto engine to encrypt transmitted frames. 75Documentation from ADMtek claims that, in addition to the 4 128-bit 76shared WEP keys, the ADM8211 will store WEP key pairs for up to 20 77peers. 78The documentation provides no details, hence 79.Nm 80does not support the 20 key-pairs. 81.Pp 82The ADM8211 operates in 802.11 infrastructure mode (with an access 83point) and in 802.11 ad hoc mode (without an access point) at 1, 842, 5.5, and 11Mbps. 85ADMtek says that the ADM8211 cannot operate as an access point. 86.Pp 87The operating mode is selected using the 88.Xr ifconfig 8 89utility. 90For more information on configuring this device, see 91.Xr ifconfig 8 92and 93.Xr ifmedia 4 . 94.Sh HARDWARE 95Cards supported by the 96.Nm 97driver include: 98.Pp 99.Bl -item -offset indent -compact 100.It 101D-Link DWL-650 Rev. ?? CardBus card 102.It 103D-Link DWL-520 Rev. C1 PCI card 104.It 105LanReady WP2000 PCI card 106.It 107TrendNet TEW-221PC CardBus card 108.It 109Xterasys XN2511B PCI card 110.It 111.El 112.Sh DIAGNOSTICS 113.Bl -diag 114.It "atw0: failed to tune channel %d" 115The driver failed to tune the radio to a new channel. 116The radio remains tuned to the old channel. 117.It "atw0: atw_si4136_write wrote %08x, SYNCTL still busy" 118The driver waited 100ms without seeing an indication that the 119ADM8211 had finished writing a register on the Si4126 RF/IF 120synthesizer. 121.It "atw0: device timeout" 122The ADM8211 failed to generate an interrupt to acknowledge a transmit 123command. 124.El 125.Sh SEE ALSO 126.Xr arp 4 , 127.Xr cardbus 4 , 128.Xr ifmedia 4 , 129.Xr netintro 4 , 130.Xr pci 4 , 131.Xr ifconfig 8 132.Rs 133.%T ADMtek 134.%U http://www.admtek.com.tw 135.Re 136.Rs 137.%T Silicon Laboratories 138.%U http://www.silabs.com 139.Re 140.Rs 141.%T RF Microdevicdes 142.%U http://www.rfmd.com 143.Re 144.Sh HISTORY 145The 146.Nm 147device driver first appeared in 148.Nx 2.0 . 149.Sh AUTHORS 150.An -nosplit 151The 152.Nm 153driver was written by 154.An David Young 155.Aq dyoung@NetBSD.org . 156For features which the ADM8211 has in common with the DECchip 21x4x, 157code was liberally borrowed from 158.Xr tlp 4 159by 160.An Jason Thorpe 161.Aq thorpej@NetBSD.org . 162.Sh BUGS 163The author does not fully understand what processing the duration 164fields for the PLCP header and the 802.11 header undergo before 165they are applied to a transmitted frame. 166If the duration fields in transmitted frames are incorrect, the 167performance of your network may suffer. 168.Pp 169The driver does not provide rate control when the media type is 170set to autoselect. 171.Pp 172The driver lets you change to hostap mode, but it does not work 173and it probably never will. 174.Pp 175The driver will sometimes complain that it cannot re-tune the radio 176because the transmit process has not gone idle. 177The author is investigating. 178.Pp 179Many features are still missing, especially WEP decryption and 180802.11 power-saving. 181.Pp 182The ad hoc mode has not been rigorously tested. 183IBSSs with the same SSID may not coalesce, but this should not 184matter for most applications. 185.Pp 186The driver is untested in the ad-hoc demo mode of Lucent WaveLAN 187cards. 188.Pp 189The ADM8211 supports 802.11 power-saving, however, 190.Nm 191does not support it yet. 192For time-bounded service, the ADM8211 will interoperate with an 193access point which implements the 802.11 Point Coordination Function, 194however, this is also not supported. 195.Pp 196Combinations of an ADM8211 with either an Intersil or a Marvell RF 197front-end are not supported. 198