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>4.1. Obtaining Information about the Infrared Port in Laptops</H1
><P
> To get the IrDA port of your laptop working with Linux/IrDA you may
use StandardInfraRed (SIR) or FastInfraRed (FIR).
</P
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1042"
></A
>4.1.1. SIR</H2
><P
> Up to 115.200bps, the infrared port emulates a serial port like the
16550A UART. This will be detected by the kernel serial driver at boot
time, or when you load the serial module. If infrared support is
enabled in the BIOS, for most laptops you will get a kernel message
like:
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><PRE
CLASS="programlisting"
> Serial driver version 4.25 with no serial options enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A #first serial port /dev/ttyS0
ttyS01 at 0x3000 (irq = 10) is a 16550A #e.g. infrared port
ttyS02 at 0x0300 (irq = 3) is a 16550A #e.g. PCMCIA modem port
</PRE
></FONT
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>
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><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1046"
></A
>4.1.2. FIR</H2
><P
> If you want to use up to 4Mbps, your machine has to be equipped with a
certain FIR chip. You need a certain Linux/IrDA driver to support this
chip. Therefore you need exact information about the FIR chip. You may
get this information in one of the following ways:
</P
><P
>
<P
></P
><OL
TYPE="1"
><LI
><P
> Read the <EM
>specification</EM
> of the machine,
though it is very rare that you will find enough and reliable information there.
</P
></LI
><LI
><P
> Try to find out whether the FIR chip is a <EM
>PCI</EM
> device.
Do a <B
CLASS="command"
>cat /proc/pci</B
> . The appropriate files for 2.2.x
kernels are in <TT
CLASS="filename"
>/proc/bus/pci</TT
> . Though often the PCI
information is incomplete. You may find the latest information about PCI
devices and vendor numbers in the kernel documentation usually in
<TT
CLASS="filename"
>/usr/src/linux/Documentation</TT
> or at the page of
<A
HREF="http://members.datafast.net.au/~dft0802/"
TARGET="_top"
>Craig Hart</A
>.
From kernel 2.1.82 on, you may use <B
CLASS="command"
>lspci</B
> from the
<B
CLASS="command"
>pci-utils</B
> package, too.
</P
></LI
><LI
><P
> Use the <EM
>DOS tool</EM
> <B
CLASS="command"
>CTPCI330.EXE</B
>
provided in ZIP format by the German computer magazine CT
<A
HREF="ftp://www.heise.de/pub/ct/ctsi/ctpci330.zip"
TARGET="_top"
>CTPCI330.ZIP</A
>
. The information provided by this program is sometimes better than that
provided by the Linux tools.
</P
></LI
><LI
><P
> Try to get information about <EM
>Plug-and-Play (PnP)</EM
> devices. Though I didn't use them for this purpose yet, the <B
CLASS="command"
>isapnp</B
> tools, could be useful.
</P
></LI
><LI
><P
> If you have installed the <EM
>Linux/<SPAN
CLASS="trademark"
>IrDA</SPAN
>® software</EM
> load the FIR modules and watch the output of <B
CLASS="command"
>dmesg</B
>, whether FIR is detected or not.
</P
></LI
><LI
><P
> Another way how to figure it out explained by Thomas Davis (modified by WH): "Dig through the FTP site of the vendor, find the <EM
>Windows9x FIR drivers</EM
>, and they have (for a SMC chip):
<TABLE
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><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
> -rw-rw-r-- 1 ratbert ratbert 743 Apr 3 1997 smcirlap.inf
-rw-rw-r-- 1 ratbert ratbert 17021 Mar 24 1997 smcirlap.vxd
-rw-rw-r-- 1 ratbert ratbert 1903 Jul 18 1997 smcser.inf
-rw-rw-r-- 1 ratbert ratbert 31350 Jun 7 1997 smcser.vxd
</PRE
></FONT
></TD
></TR
></TABLE
>
If in doubt, always look for the .inf/.vxd drivers for Windows95. Windows95 doesn't ship with _ANY_ FIR drivers. (they are all third party, mostly from Counterpoint, who was assimilated by ESI)."
</P
></LI
><LI
><P
> Also Thomas Davis found a package of small <EM
>DOS utilities made
by SMSC</EM
>. Look at
<A
HREF="http://www.smsc.com/main/tools/appsoftware/ir_utils.zip"
TARGET="_top"
>IR_UTILS.ZIP</A
>
(note this link is no longer valid, but I haven't found out whether this
tool is still available somewhere else).
The package contains <B
CLASS="command"
>FINDCHIP.EXE</B
>. And includes a
<B
CLASS="command"
>FIRSETUP.EXE</B
> utility that is supposed to be
able to set all values except the chip address. Furthermore it contains
<B
CLASS="command"
>BIOSDUMP.EXE</B
>, which produces this output:
</P
><P
> Example 1 (from a COMPAQ Armada 1592DT)
</P
><P
> <TABLE
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WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
> In current devNode:
Size = 78
Handle = 14
ID = 0x1105D041 = 'PNP0511' -- Generic IrDA SIR
Types: Base = 0x07, Sub = 0x00, Interface = 0x02
Comm. Device, RS-232, 16550-compatible
Attribute = 0x80
CAN be disabled
CAN be configured
BOTH Static & Dynamic configuration
Allocated Resource Descriptor Block TAG's:
TAG=0x47, Length=7 I/O Tag, 16-bit Decode
Min=0x03E8, Max=0x03E8
Align=0x00, Range=0x08
TAG=0x22, Length=2 IRQ Tag, Mask=0x0010
TAG=0x79, Length=1 END Tag, Data=0x2F
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Result 1:
</P
><P
> <B
CLASS="command"
>Irq Tag, Mask (bit mapped - ) = 0x0010 = 0000 0000 0000 0001 0000</B
> so, it's IRQ 4. (start at 0, count up ..), so this is a SIR only device, at IRQ=4, IO=x03e8.
</P
><P
> Example 2 (from an unknown machine)
</P
><P
>
<TABLE
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><TD
><FONT
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><PRE
CLASS="programlisting"
> In current devNode:
Size = 529
Handle = 14
ID = 0x10F0A34D = 'SMCF010' -- SMC IrCC
Types: Base = 0x07, Sub = 0x00, Interface = 0x02
Comm. Device, RS-232, 16550-compatible
Attribute = 0x80
CAN be disabled
CAN be configured
BOTH Static & Dynamic configuration
Allocated Resource Descriptor Block TAG's:
TAG=0x47, Length=7 I/O Tag, 16-bit Decode
Min=0x02F8, Max=0x02F8
Align=0x00, Range=0x08
TAG=0x22, Length=2 IRQ Tag, Mask=0x0008
TAG=0x47, Length=7 I/O Tag, 16-bit Decode
Min=0x02E8, Max=0x02E8
Align=0x00, Range=0x08
TAG=0x2A, Length=2 DMA Tag, Mask=0x02, Info=0x08
TAG=0x79, Length=1 END Tag, Data=0x00
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Result 2:
</P
><P
> a) it's a SMC IrCC chip
</P
><P
> b) one portion is at 0x02f8, has an io-extent of 8 bytes; irq = 3
</P
><P
> c) another portion is at 0x02e8, io-extent of 8 bytes; dma = 1 (0x02 =0000 0010)
</P
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><TD
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><P
> The package is not intended for the end user, and some of the utilities could be harmful.
The only documentation in the package is in Microsoft Word format.
</P
></TD
></TR
></TABLE
></DIV
></LI
><LI
><P
> Use the <EM
>Device Manager</EM
> of the MicroSoft Windows9x/NT operating system.
</P
></LI
><LI
><P
> You may also use the <EM
>hardware surveys</EM
> mentioned below.
</P
></LI
><LI
><P
> And as a last resort, you may even open the laptop and look at
the inscriptions at the chips themselfs. Here is a probably
incomplete list of manufacturers: Chrystal, Hewlett Packard (HP,
chipsets are marked HSDL), Hitachi, IBM, National Semi Conductor
(NSC), NEC, Philips, Sharp, Standard Micro Systems Corporation
(SMC/SMSC), Texas Instruments (TI), VLSI, Winbond. As an example
of application circuits the HSDL-7001 (from a HP brochure,
modified by WH):
<TABLE
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><TD
><FONT
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><PRE
CLASS="programlisting"
> LEDs Encode/Decode SIR/FIR
HSDL-1001 HSDL-7001 UART 16550/
MicroController
______ ______________ ____________
| | | | | |
(|| TXD|<---|IR_TXD TXD|<---|SOUT |
| | | | | |
| | | RCV|--->|SIN |
| | | | | |
(|| RCV|--->|IR_RCV 16XCLK|<---|BAUDOUT |
| | | NRST|-+ | |
------ -------------- | ------------
V
</PRE
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