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?? developing a device driver.mht

?? What is this ``device driver stuff anyway? Here s a very short introduction to the concept.
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Subject: Developing a Device Driver
Date: Sun, 25 Feb 2007 15:05:24 +0530
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<HR>

<P>
<H1>2&nbsp;&nbsp;&nbsp;&nbsp;Developing a Device Driver</H1>
<P>This chapter discusses how you develop a device driver. Included is a =
simple=20
example called <TT>/dev/none</TT>, which is written by a fictitious =
third-party=20
driver company called EasyDriver Incorporated. The <TT>/dev/none</TT> =
device=20
driver is a simple device driver that implements many of the character =
device=20
driver interfaces. Note, however, that the <TT>/dev/none</TT> driver =
does not=20
control a real hardware device.=20
<P><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#dev_drv_wrkshts">Appendix=20
C</A> provides worksheets to illustrate the kinds of information you =
need to=20
gather to make developing the device driver easier. These worksheets are =
filled=20
in for the <TT>/dev/none</TT> driver. <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#dev_drv_wrkshts">Appendix=20
C</A> also provides these same worksheets for use in developing your own =
device=20
drivers. If you use the worksheets for your driver development, consider =

organizing them in a device driver project binder. This will make them =
available=20
to systems engineers who need to maintain the driver.=20
<P>Specifically, the chapter describes the following tasks associated =
with=20
developing any device driver:=20
<UL>
  <P>
  <LI>Gathering information=20
  <P></P>
  <LI>Designing the device driver=20
  <P></P>
  <LI>Understanding system data and address types that device drivers =
use=20
  <P></P>
  <LI>Specifying the method for registering device interrupt handlers=20
  <P></P>
  <LI>Specifying the method for identifying bus, controller, and device=20
  information=20
  <P></P>
  <LI>Determining the structure allocation technique=20
  <P></P>
  <LI>Creating a device driver development environment </LI></UL>
<P><A name=3Dgather_info></A>
<P>
<HR>

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<P>
<HR>

<P>
<H2>2.1&nbsp;&nbsp;&nbsp;&nbsp;Gathering Information </H2>
<P>The first task in writing a device driver is to gather pertinent =
information=20
about the host system and the device for which you are writing the =
driver. You=20
need to:=20
<UL>
  <P>
  <LI>Specify information about the host system=20
  <P></P>
  <LI>Identify the conventions used in writing the driver=20
  <P></P>
  <LI>Specify characteristics of the device=20
  <P></P>
  <LI>Describe device usage=20
  <P></P>
  <LI>Provide a description of the device registers=20
  <P></P>
  <LI>Identify support in writing the driver </LI></UL>
<P>The following sections describe how you would fill out the worksheets =

provided for each of these tasks, using the <TT>/dev/none</TT> device =
driver as=20
an example. <A name=3Dspecinfo_abouthostsys></A>
<P>
<HR>

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<P>
<HR>

<P>
<H3>2.1.1&nbsp;&nbsp;&nbsp;&nbsp;Specifying Information About the Host =
System=20
</H3>
<P><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#hostsys_wkshtfordevnone">Figure=20
C-1</A> and <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#hostsys2_wkshtfordevnone">Figure=20
C-2</A> show the host system information associated with the =
<TT>/dev/none</TT>=20
driver. <A name=3Dnx_id_33></A>As the worksheets show, you gather the =
following=20
information about the host system:=20
<UL>
  <P>
  <LI>The host CPU or CPUs your driver operates on=20
  <P></P>
  <LI>The operating system or systems your driver operates on=20
  <P></P>
  <LI>The bus or buses that your driver connects to </LI></UL>
<P><A name=3DSpecHostCPU></A>
<P>
<HR>

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