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/* aheader.h: [one line description of the file]
* --------------------------------------------------------------------
*
* [Project Name]
*
* [License Statement, eg.
* The contents of this file are subject to the Mozilla Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/ ]
*
* [Warranty Statement, eg.
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License. ]
*
* [Author contact, eg.
* The initial developer of the original code is Mark S. Mathews
* &lt mark@absoval.com &gt. Portions created by Mark S. Mathews
* are Copyright (C) 1998 AbsoluteValue Software, Inc. All
* Rights Reserved. ]
*
* [Change History]
*
* [Verbose Description]
*
* [Implementation and usage notes]
*
* [References]
*
* --------------------------------------------------------------------
*/
#ifndef _AHEADER_H
#define _AHEADER_H
/*=============================================================*/
/*------ Constants --------------------------------------------*/
/*--- Fixed memory offsets --------------------------*/
#define SU_OFF_LAST_TXDESC 0x3ec
#define SU_OFF_RSVD1 0x400
#define SU_OFF_BANNER 0x480
#define SU_OFF_CMD_BLK 0x4a0
#define SU_OFF_CNTL_STATUS_BLK 0x4f0
#define SU_OFF_VBM 0x500
#define SU_OFF_BUFFER 0x600
/*--- Global Sizes ----------------------------------*/
#define SU_LEN_BANNER 32
/*=============================================================*/
/*------ Macros -----------------------------------------------*/
/*--- next testing macro (applies to Rx and Tx) -------*/
#define SUTXD_ISLAST(x) ((x) & BIT31)
#define SURXD_ISLAST(x) ((x) & BIT31)
/*=============================================================*/
/*------ Types and their related constants --------------------*/
/*--- Last Completed Tx Descriptor Block ---------------*/
__WLAN_PRAGMA_PACK1__
typedef struct am930txcmplt_blk
{
volatile UINT32 last_bcast __WLAN_ATTRIB_PACK__;
volatile UINT32 last_mgmt __WLAN_ATTRIB_PACK__;
volatile UINT32 last_data __WLAN_ATTRIB_PACK__;
volatile UINT32 last_pspoll __WLAN_ATTRIB_PACK__;
volatile UINT32 last_cfpoll __WLAN_ATTRIB_PACK__;
} am930txcmplt_blk_t;
__WLAN_PRAGMA_PACKDFLT__
#define TXCMPLT_OFF_BCAST 0
#define TXCMPLT_OFF_MGMT 4
#define TXCMPLT_OFF_DATA 8
#define TXCMPLT_OFF_PSPOLL 12
#define TXCMPLT_OFF_CFPOLL 16
typedef void (*am930hw_scan_callback_t)(void *);
/*=============================================================*/
/*--- Function Declarations -----------------------------------*/
/*=============================================================*/
/* public: */
am930hw_t*
am930hw_construct(UINT32 irq, UINT32 iobase,
UINT32 membase, am930mac_t *mac);
void
am930hw_destruct(am930hw_t *hw);
int
am930hw_init_rx_tx( am930hw_t *hw );
void
am930hw_ISR( am930hw_t *hw );
UINT32
am930hw_joinbss( am930hw_t *hw, UINT32 ch, UINT32 newBSS,
UINT8 *bssid, wlan_ie_ssid_t *ssid, UINT32 bcn_int,
wlan_bss_ts_t ts, UINT32 sutro_ref_time );
UINT32
am930hw_scan( am930hw_t *hw, UINT32 cntl, UINT8 *bssid,
UINT32 ch, UINT32 duration,
am930hw_scan_callback_t cb, void *callback_arg );
UINT32
am930hw_reset( am930hw_t *hw );
/*=============================================================*/
/*--- Inline Function Definitions (if supported) --------------*/
/*=============================================================*/
/*----------------------------------------------------------------
* am930hw_reset
*
* Perform reset of am930 part and test for valid operation
* operation following reset.
*
* returns: zero on success, non-zero if part fails to come up
* after reset.
----------------------------------------------------------------*/
__INLINE__ UINT32 am930hw_reset( am930hw_t* hw)
{
UINT32 result = 0;
/* perform reset */
/* test part */
return result;
}
#endif /* _AHEADER_H */
</PRE></TD>
</TABLE>

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<TABLE border=1>
<TR><TD><PRE>
/* asource.c: [one line description of file]
* --------------------------------------------------------------------
*
* [Project Name]
*
* [License Statement, eg.
* The contents of this file are subject to the Mozilla Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/ ]
*
* [Warranty Statement, eg.
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License. ]
*
* [Author contact, eg.
* The initial developer of the original code is Mark S. Mathews
* &lt mark@absoval.com &gt. Portions created by Mark S. Mathews
* are Copyright (C) 1998 AbsoluteValue Software, Inc. All
* Rights Reserved. ]
*
* [Change History]
*
* [Verbose Description]
*
* [Implementation and usage notes]
*
* [References]
*
* --------------------------------------------------------------------
*/
/* Portability/Compatibility header */
#include &lt;wlan/wlan_compat.h&gt;
/* The following prevents &quot;kernel_version&quot; from being set in this file. */
#define __NO_VERSION__
/* Non-project specific includes */
/* PCMCIA headers generated during PCMCIA package installation */
#include &lt;pcmcia/config.h&gt;
#include &lt;pcmcia/k_compat.h&gt;
/* Module related headers, non-module drivers should not include */
#include &lt;linux/version.h&gt;
#include &lt;assert.h&gt;
#include &lt;linux/delay.h&gt;
#include &lt;linux/kernel.h&gt;
#include &lt;linux/types.h&gt;
#include &lt;linux/fcntl.h&gt;
#include &lt;linux/interrupt.h&gt;
#include &lt;linux/ptrace.h&gt;
#include &lt;linux/ioport.h&gt;
#include &lt;linux/in.h&gt;
#include &lt;linux/malloc.h&gt;
#include &lt;linux/string.h&gt;
#include &lt;linux/timer.h&gt;
#include &lt;asm/system.h&gt;
#include &lt;asm/bitops.h&gt;
#include &lt;asm/io.h&gt;
#include &lt;linux/errno.h&gt;
/* Project Includes */
#include &lt;wlan/version.h&gt;
#include &lt;wlan/am930mib.h&gt;
#include &lt;wlan/p80211hdr.h&gt;
#include &lt;wlan/p80211mgmt.h&gt;
#include &lt;wlan/wlan_ioctl.h&gt;
#include &lt;wlan/wlan_stable.h&gt;
#include &quot;am930di.h&quot;
#include &quot;am930llc.h&quot;
#include &quot;am930mac.h&quot;
#include &quot;am930hw.h&quot;
#include &quot;am930mgr.h&quot;
/*====================================================================*/
/* Local Constants */
/*====================================================================*/
#define ACONSTANT 22
/*====================================================================*/
/* Local Types */
/*====================================================================*/
typdef struct atype
{
struct atype *next;
struct atype *prev;
} atype_t;
/*====================================================================*/
/* Static data defined in this file */
/*====================================================================*/
UINT8 wepkey[WLAN_WEP_NKEYS][WLAN_WEP_KEYLEN] =
{
{ 0xf1, 0x10, 0xec, 0xe0, 0xdc },
{ 0x0f, 0xf2, 0x04, 0x09, 0xfb },
{ 0x13, 0x37, 0xf2, 0xf9, 0x2d },
{ 0xe9, 0x17, 0x19, 0x63, 0xc7 }
};
/*====================================================================*/
/* Local Function Declarations */
/*====================================================================*/
static void am930mgr_authen1_rx( am930mgr_t *mgr, wlan_fr_authen_t *f );
static void am930mgr_authen2_rx( am930mgr_t *mgr, wlan_fr_authen_t *f );
static void am930mgr_authen3_rx( am930mgr_t *mgr, wlan_fr_authen_t *f );
static void am930mgr_authen4_rx( am930mgr_t *mgr, wlan_fr_authen_t *f );
/*====================================================================*/
/* Function Definitions */
/*====================================================================*/
/*----------------------------------------------------------------
* am930mgr_assoc_begin_sta
*
* Start the station association procedure. Namely, send an
* association request frame to the AP.
*
* returns: nothing for now
----------------------------------------------------------------*/
void am930mgr_assoc_begin_sta(am930mgr_t *mgr)

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/* [filename]: [one line description of the file]
* --------------------------------------------------------------------
*
* Linux WLAN
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The initial developer of the original code is Mark S. Mathews
* <mark@absoval.com>. Portions created by Mark S. Mathews
* are Copyright (C) 1998 AbsoluteValue Software, Inc. All Rights Reserved.
*
* --------------------------------------------------------------------
*
* The initial author may be reached as mark@absoval.com, or
* C/O AbsoluteValue Software Inc., P.O. Box 941149,
* Maitland, FL, 32794-1149
*
* --------------------------------------------------------------------
*
* [File Description]
*
* [Implementation and Usage Notes]
*
* --------------------------------------------------------------------
*/
/*================================================================*/
/* System Includes */
/*================================================================*/
/* Project Includes */
/*================================================================*/
/* Local Constants */
/*================================================================*/
/* Local Macros */
/*================================================================*/
/* Local Types */
/*================================================================*/
/* Local Static Definitions */
/*----------------------------------------------------------------*/
/* --A subsection */
/*================================================================*/
/* Local Function Declarations */
/*----------------------------------------------------------------
* [function name]
*
* [Description]
*
* Arguments:
* [arglist]
*
* Returns:
* [retlist]
*
* Side effects:
* [desc]
*
* Call context:
* [desc]
----------------------------------------------------------------*/
int afunction(void)
{
DBFENTER;
if ( a ) {
prinf("xxx");
}
DBFEXIT;
return 0;
}

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<HTML>
<HEAD>
<TITLE>AVS C Source file format</TITLE>
</HEAD>
<BODY>
<H1>1. C Source file format</H1>
<P>
The following defines the common C source file format for linux-wlan.
Most of the C-code formatting rules come from the linux kernel
document <CODE>CodingStyle</CODE>.
<H1>2. Characters and Code layout</H1>
<H2>2.1. Character Set</H2>
<P>
For all source files, we'll stick to the US character set and avoid all
trigraphs.
<H2>2.2. Indentation</H2>
<P>
All indentation will be done using tab characters which are mapped to a
spacing of eight characters.
<H2>2.3. Braces</H2>
<P>
Braces will be placed according to the format originally established
in Kernighan and Ritchie's book "The C Programming Language". Here
are some example statements:
<P>
<TABLE border=1><TR><TD><PRE>
for ( i= 0; i &lt; N; i++) {
.
.
.
}
if ( a &lt; b ) {
.
.
.
} else {
.
.
.
}
do {
.
.
.
} while ( i &gt> 0 );
</PRE></TABLE>
<H1>3. Naming and Definition Conventions</H1>
<H2>3.1. Preprocessor Elements</H2>
<P>
All elements defined via the C preprocessor (constants and macros) are
named using all capital letters. An exception is for macros that are
either wrapping function calls for portability or for macros that are
inline replacements for code that would normally be in a function.
<H2>3.2. Types</H2>
<P>
All programmer defined types must have single word type names
defined using the <PRE>typedef</PRE> statement. All type names
should be identified with an <PRE>_t</PRE> suffix. This is
particularly important for function pointers that are members of
structures or arguments to functions.
<P>
Anonymous types are not allowed. All struct, union, and enum
types shall be named and typedef'd.
<H2>3.3. Variables</H2>
The following conventions should be followed for variable
declaration and naming:
<UL>
<LI>Variables should be named using meaningful names.
<LI>Avoid variables with static lifetimes.
<LI>If static lifetime variables must be used, use file
scoped static variables and avoid static lifetime
variables with visibility beyond file scope.
<LI>All static lifetime variables should be declared in
the "Local Statics" section near the top of a given
source file.
</UL>
<H2>3.4. Functions</H2>
The following conventions should be followed for function
declaration and definition:
<UL>
<LI><B>All</B> functions must be declared above the point
where they are called.
<LI>Any functions that are only intended to be called
within a given source file should be declared static
within that file.
<LI>Functions defined within a common source file that are
visible across source file boundaries should be named
using a prefix that is unique to that source file.
</UL>
<H1>4. File Layout</H1>
<P>
Each file should be layed out using a common format. The
following shows a complete file with all its major sections.
<P>
Each major section within the file is begun with a comment of the
form:
<PRE>
/*================================================================*/
/* [Section Name] */
</PRE>
<P>
Subsections within a major section are denoted using:
<PRE>
/*----------------------------------------------------------------*/
/* [Subsection Name] */
</PRE>
<P>
<TABLE border=1><TR><TD>
<PRE>
/* [filename]: [one line description of the file]
* --------------------------------------------------------------------
*
* [Project Name]
*
* [License Statement]
*
* [Warranty Statement]
*
* [Initial Author Statement]
*
* --------------------------------------------------------------------
*
* [Initial Author Contact]
*
* --------------------------------------------------------------------
*
* [File Description]
*
* [Implementation and Usage Notes]
*
* --------------------------------------------------------------------
*/
/*================================================================*/
/* System Includes */
/*================================================================*/
/* Project Includes */
/*================================================================*/
/* Local Constants */
/*================================================================*/
/* Local Macros */
/*----------------------------------------------------------------*/
/* [A subsection] */
/*================================================================*/
/* Local Types */
/*================================================================*/
/* Local Static Definitions */
/*================================================================*/
/* Local Function Declarations */
/*================================================================*/
/* Function Definitions */
</PRE>
</TABLE>
<H2>4.1. System Includes Section</H2>
<P>
Preprocessor <CODE>#include</CODE> statements that are including
<I>system</I> includes shall be placed in this section. System
includes are those include files that are <B>not</B> part of the
managed source for this project.
<H2>4.2. Project Includes Section</H2>
<P>
Preprocessor <CODE>#include</CODE> statements that are including
<I>project</I> includes shall be placed in this section. Project
includes are those include files that are a part of the
managed source for this project.
<H2>4.3. Local Constants Section</H2>
<P>
Preprocessor "manifest" constants that are local to this file shall be
placed in this section. "Manifest" constants are preprocessor macros
that take no arguments.
<H2>4.4. Local Macros Section</H2>
<P>
Proprocessor macros that accept arguments shall be placed in this
section.
<H2>4.5. Local Types Section</H2>
<P>
Programmer defined types that are only used within the scope of this
file shall be defined in this section. Programmer defined types that
are used in more than one source file should be defined in a header
file.
<H2>4.6. Local Static Definitions Section</H2>
<P>
Variables with static extent that are defined within this file shall
be placed in this section. Whether a variable has scope beyond this
file will be apparent based on the presence or absence of the
<CODE>static</CODE> keyword in the declaration. If a variable is
declared without the <CODE>static</CODE> keyword, there should be an
<CODE>extern</CODE> declaration for that variable in a header file.
<H2>4.6. Local Function Declarations Section</H2>
<P>
Functions that are only used within this file should be declared
(prototyped) in this section. Additionally, these functions should be
declared using the <CODE>static</CODE> keyword. This avoids polluting
the global namespace with function names that need not be
<CODE>extern</CODE>.
<P>
Any functions defined in this file that <I>are</I> called from outside
this file should be declared (prototyped) in a header file.
<H2>4.6. Function Definitions Section</H2>
<P>
This section contains the definitions of the functions in this file.
Each function (or group of strongly related functions) will be
preceded by a function header comment (see below).
<H1>5. Comments</H1>
<H2>5.1. File Header</H2>
<P>
Each source file will have a header comment containing information
about the file as a whole. That comment shall be formatted:
<P>
<TABLE border=1><TR><TD><PRE>
/* [filename]: [one line description of the file]
* --------------------------------------------------------------------
*
* [Project Name]
*
* [License Statement]
*
* [Warranty Statement]
*
* [Initial Author Statement]
*
* --------------------------------------------------------------------
*
* [Initial Author Contact]
*
* --------------------------------------------------------------------
*
* [File Description]
*
* [Implementation and Usage Notes]
*
* --------------------------------------------------------------------
*/
</PRE>
</TABLE>
<H2>5.2. Function Header</H2>
<P>
Each function (or group of closely related functions) will be preceded
by a function comment header. The <CODE>Side effects</CODE> and
<CODE>Call context</CODE> sections are optional.
<P>
<TABLE border=1><TR><TD><PRE>
/*----------------------------------------------------------------
* [function name]
*
* [description]
*
* Arguments:
* [argument list]
*
* Returns:
* [return value list]
*
* Side effects:
* [description of function side effects]
*
* Call context:
* [description of calling context]
----------------------------------------------------------------*/
</PRE>
</TABLE>
</BODY>
</HTML>

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Linux kernel coding style
This is a short document describing the preferred coding style for the
linux kernel. Coding style is very personal, and I won't _force_ my
views on anybody, but this is what goes for anything that I have to be
able to maintain, and I'd prefer it for most other things too. Please
at least consider the points made here.
First off, I'd suggest printing out a copy of the GNU coding standards,
and NOT read it. Burn them, it's a great symbolic gesture.
Anyway, here goes:
Chapter 1: Indentation
Tabs are 8 characters, and thus indentations are also 8 characters.
There are heretic movements that try to make indentations 4 (or even 2!)
characters deep, and that is akin to trying to define the value of PI to
be 3.
Rationale: The whole idea behind indentation is to clearly define where
a block of control starts and ends. Especially when you've been looking
at your screen for 20 straight hours, you'll find it a lot easier to see
how the indentation works if you have large indentations.
Now, some people will claim that having 8-character indentations makes
the code move too far to the right, and makes it hard to read on a
80-character terminal screen. The answer to that is that if you need
more than 3 levels of indentation, you're screwed anyway, and should fix
your program.
In short, 8-char indents make things easier to read, and have the added
benefit of warning you when you're nesting your functions too deep.
Heed that warning.
Chapter 2: Placing Braces
The other issue that always comes up in C styling is the placement of
braces. Unlike the indent size, there are few technical reasons to
choose one placement strategy over the other, but the preferred way, as
shown to us by the prophets Kernighan and Ritchie, is to put the opening
brace last on the line, and put the closing brace first, thusly:
if (x is true) {
we do y
}
However, there is one special case, namely functions: they have the
opening brace at the beginning of the next line, thus:
int function(int x)
{
body of function
}
Heretic people all over the world have claimed that this inconsistency
is ... well ... inconsistent, but all right-thinking people know that
(a) K&R are _right_ and (b) K&R are right. Besides, functions are
special anyway (you can't nest them in C).
Note that the closing brace is empty on a line of its own, _except_ in
the cases where it is followed by a continuation of the same statement,
ie a "while" in a do-statement or an "else" in an if-statement, like
this:
do {
body of do-loop
} while (condition);
and
if (x == y) {
..
} else if (x > y) {
...
} else {
....
}
Rationale: K&R.
Also, note that this brace-placement also minimizes the number of empty
(or almost empty) lines, without any loss of readability. Thus, as the
supply of new-lines on your screen is not a renewable resource (think
25-line terminal screens here), you have more empty lines to put
comments on.
Chapter 3: Naming
C is a Spartan language, and so should your naming be. Unlike Modula-2
and Pascal programmers, C programmers do not use cute names like
ThisVariableIsATemporaryCounter. A C programmer would call that
variable "tmp", which is much easier to write, and not the least more
difficult to understand.
HOWEVER, while mixed-case names are frowned upon, descriptive names for
global variables are a must. To call a global function "foo" is a
shooting offense.
GLOBAL variables (to be used only if you _really_ need them) need to
have descriptive names, as do global functions. If you have a function
that counts the number of active users, you should call that
"count_active_users()" or similar, you should _not_ call it "cntusr()".
Encoding the type of a function into the name (so-called Hungarian
notation) is brain damaged - the compiler knows the types anyway and can
check those, and it only confuses the programmer. No wonder MicroSoft
makes buggy programs.
LOCAL variable names should be short, and to the point. If you have
some random integer loop counter, it should probably be called "i".
Calling it "loop_counter" is non-productive, if there is no chance of it
being mis-understood. Similarly, "tmp" can be just about any type of
variable that is used to hold a temporary value.
If you are afraid to mix up your local variable names, you have another
problem, which is called the function-growth-hormone-imbalance syndrome.
See next chapter.
Chapter 4: Functions
Functions should be short and sweet, and do just one thing. They should
fit on one or two screenfuls of text (the ISO/ANSI screen size is 80x24,
as we all know), and do one thing and do that well.
The maximum length of a function is inversely proportional to the
complexity and indentation level of that function. So, if you have a
conceptually simple function that is just one long (but simple)
case-statement, where you have to do lots of small things for a lot of
different cases, it's OK to have a longer function.
However, if you have a complex function, and you suspect that a
less-than-gifted first-year high-school student might not even
understand what the function is all about, you should adhere to the
maximum limits all the more closely. Use helper functions with
descriptive names (you can ask the compiler to in-line them if you think
it's performance-critical, and it will probably do a better job of it
that you would have done).
Another measure of the function is the number of local variables. They
shouldn't exceed 5-10, or you're doing something wrong. Re-think the
function, and split it into smaller pieces. A human brain can
generally easily keep track of about 7 different things, anything more
and it gets confused. You know you're brilliant, but maybe you'd like
to understand what you did 2 weeks from now.
Chapter 5: Commenting
Comments are good, but there is also a danger of over-commenting. NEVER
try to explain HOW your code works in a comment: it's much better to
write the code so that the _working_ is obvious, and it's a waste of
time to explain badly written code.
Generally, you want your comments to tell WHAT your code does, not HOW.
Also, try to avoid putting comments inside a function body: if the
function is so complex that you need to separately comment parts of it,
you should probably go back to chapter 4 for a while. You can make
small comments to note or warn about something particularly clever (or
ugly), but try to avoid excess. Instead, put the comments at the head
of the function, telling people what it does, and possibly WHY it does
it.
Chapter 6: You've made a mess of it
That's OK, we all do. You've probably been told by your long-time Unix
user helper that "GNU emacs" automatically formats the C sources for
you, and you've noticed that yes, it does do that, but the defaults it
uses are less than desirable (in fact, they are worse than random
typing - a infinite number of monkeys typing into GNU emacs would never
make a good program).
So, you can either get rid of GNU emacs, or change it to use saner
values. To do the latter, you can stick the following in your .emacs file:
(defun linux-c-mode ()
"C mode with adjusted defaults for use with the Linux kernel."
(interactive)
(c-mode)
(c-set-style "K&R")
(setq c-basic-offset 8))
This will define the M-x linux-c-mode command. When hacking on a
module, if you put the string -*- linux-c -*- somewhere on the first
two lines, this mode will be automatically invoked. Also, you may want
to add
(setq auto-mode-alist (cons '("/usr/src/linux.*/.*\\.[ch]$" . linux-c-mode)
auto-mode-alist))
to your .emacs file if you want to have linux-c-mode switched on
automagically when you edit source files under /usr/src/linux.
But even if you fail in getting emacs to do sane formatting, not
everything is lost: use "indent".
Now, again, GNU indent has the same brain dead settings that GNU emacs
has, which is why you need to give it a few command line options.
However, that's not too bad, because even the makers of GNU indent
recognize the authority of K&R (the GNU people aren't evil, they are
just severely misguided in this matter), so you just give indent the
options "-kr -i8" (stands for "K&R, 8 character indents").
"indent" has a lot of options, and especially when it comes to comment
re-formatting you may want to take a look at the manual page. But
remember: "indent" is not a fix for bad programming.