RCS file: openf.c,v
Working file: openf.c
head: 1.6
branch:
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root: 1.6
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keyword substitution: kv
total revisions: 6;    selected revisions: 6
description:
The functionality of chardev_open() is implemented here inside this file.Whenever the application calls the open function,this is always the first operation performed on the device file.
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revision 1.6    locked by: root;
date: 2014/03/01 08:45:54;  author: root;  state: Exp;  lines: +5 -1
Printing the address stored inside the lsculldev to check whether it matches with the filep->private data address printed inside the chardev_release() function.
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revision 1.5
date: 2014/03/01 08:33:40;  author: root;  state: Exp;  lines: +1 -0
Once the Sculldev structure is found by the container_of() macro,a pointer to the scull is stored in the private_data field of the file structure for easier access    .
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revision 1.4
date: 2014/03/01 08:25:52;  author: root;  state: Exp;  lines: +11 -4
A local variable of type struct Sculldev is declared.
Used container_of() inside the open function.This macro has 3 arguments:
1.A pointer to a field named container_field.
2.This container field within a structure of type container_type,and
3.ccontainer field.
On success it returns a pointer to the containing structure.
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revision 1.3
date: 2014/02/28 18:51:08;  author: root;  state: Exp;  lines: +2 -0
Included the prototype of chardev_open() using extern.
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revision 1.2
date: 2014/02/28 18:42:56;  author: root;  state: Exp;  lines: +15 -0
Two printk statements are used to test that whether the open function is actually begin and ended.\
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revision 1.1
date: 2014/02/28 18:33:28;  author: root;  state: Exp;
Initial revision
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RCS file: cleanup.c,v
Working file: cleanup.c
head: 1.6
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root: 1.6
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keyword substitution: kv
total revisions: 6;    selected revisions: 6
description:
File that contains the cleanup function which returns all the resources back to the system.
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revision 1.6    locked by: root;
date: 2014/02/28 15:35:01;  author: root;  state: Exp;  lines: +1 -0
kfree() function is used for freeing the memory.
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revision 1.5
date: 2014/02/27 20:15:39;  author: root;  state: Exp;  lines: +3 -1
A variable of type int representing the number of devices is included here using extern.
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revision 1.4
date: 2014/02/27 19:36:03;  author: root;  state: Exp;  lines: +1 -0
A variable dev of type dev_t storing the device number is included here using extern.
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revision 1.3
date: 2014/02/27 19:33:49;  author: root;  state: Exp;  lines: +3 -1
Called unregister_chrdev_region() which is having 2 arguments: device number and the total number of device numbers to unregister.
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revision 1.2
date: 2014/02/27 18:58:02;  author: root;  state: Exp;  lines: +14 -0
module_exit() macro is used to define which function is to be called at module removal time.\
The function specified by the module_exit() macro is declared static because it is not meant to be visible outside the file.
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revision 1.1
date: 2014/02/27 18:55:42;  author: root;  state: Exp;
Initial revision
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RCS file: closef.c,v
Working file: closef.c
head: 1.3
branch:
locks: strict
root: 1.3
access list:
symbolic names:
keyword substitution: kv
total revisions: 3;    selected revisions: 3
description:
chardev_release() function live here.
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revision 1.3    locked by: root;
date: 2014/03/01 08:42:45;  author: root;  state: Exp;  lines: +5 -1
Making a check by printing the address stored inside the filep->private_data matches with the lsculldev value returned by the container_of() macro.
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revision 1.2
date: 2014/02/28 20:37:55;  author: root;  state: Exp;  lines: +2 -2
chardev_release() function is called when the application calls close() system call.
Two printk statements are used as debug statements to find out whether this function is called or not.
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revision 1.1
date: 2014/02/28 20:37:08;  author: root;  state: Exp;
Initial revision
=============================================================================
RCS file: header.h,v
Working file: header.h
head: 1.16
branch:
locks: strict
root: 1.16
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total revisions: 16;    selected revisions: 16
description:
Base header file that includes the definitions of all the macros,structures and contains the necessary header files required by the module code.
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revision 1.16    locked by: root;
date: 2014/02/28 17:13:48;  author: root;  state: Exp;  lines: +2 -0
Header file:<linux/types.h> is added to support dev_t type.
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revision 1.15
date: 2014/02/28 16:58:15;  author: root;  state: Exp;  lines: +6 -0
Two macros are defined called MAJOR_NO and MINOR_NO.
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revision 1.14
date: 2014/02/28 15:44:56;  author: root;  state: Exp;  lines: +2 -2
The macro DEVICE_NAME is changed to DRIVER_NAME and the header file:<string.h> is removed.
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revision 1.13
date: 2014/02/28 15:41:31;  author: root;  state: Exp;  lines: +1 -1
Header file:<linux/cdev.h> is added to support a cdev structure.The cdev structure is used to register the driver with the kernel.
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revision 1.12
date: 2014/02/28 15:33:59;  author: root;  state: Exp;  lines: +1 -0
Header file:<string.h> is added to support memset() function.
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revision 1.11
date: 2014/02/28 15:18:15;  author: root;  state: Exp;  lines: +16 -0
Four macros are defined namely:DEVICE_SIZE , DATA_SIZE , QUANTUM and QSET.
These macros are used to initialize the fields inside the Scull_Dev structure.
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revision 1.10
date: 2014/02/28 15:10:35;  author: root;  state: Exp;  lines: +16 -0
Two structures are defined of type Sculldev and Scullqset.Sculldev is a structure that is used to hold device information.Scullqset is a structure that holds a pointer to the qset array and another pointer to a structure of Scullqset type.
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revision 1.9
date: 2014/02/27 21:07:42;  author: root;  state: Exp;  lines: +1 -0
Header file:<linux/slab.h> is added to support kmalloc() and kfree() functions.
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revision 1.8
date: 2014/02/27 20:02:53;  author: root;  state: Exp;  lines: +1 -0
Header file:<linux/moduleparam.h> is added to support the module_param() macro.With the help of this macro parameters can be passed to a module while loading it.
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revision 1.7
date: 2014/02/27 19:28:38;  author: root;  state: Exp;  lines: +4 -0
A macro called DEVICE_NAME is defined using #define.
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revision 1.6
date: 2014/02/27 19:20:01;  author: root;  state: Exp;  lines: +1 -0
Header file:<linux/fs.h> is added to the base header file to support various functions like alloc_chrdev_region(),unregister_chrdev_region(),etc.
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revision 1.5
date: 2014/02/27 18:44:36;  author: root;  state: Exp;  lines: +4 -0
A macro called DEBUG is defined using #define.
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revision 1.4
date: 2014/02/27 18:41:13;  author: root;  state: Exp;  lines: +2 -0
A special macro called MODULE_LICENSE is used to tell the kernel that the module bears a free license without such a decleration the kernel complains.
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revision 1.3
date: 2014/02/27 18:38:11;  author: root;  state: Exp;  lines: +1 -1
Header file:<linux/module.h> is added to the base header file to provide support for a great many number of macros like:MODULE_LICENSE , MODULE_AUTHOR,etc.
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revision 1.2
date: 2014/02/27 18:36:07;  author: root;  state: Exp;  lines: +2 -0
Header file:<linux/init.h> is added to the base header file to provide support for module_init() and module_exit() macros.
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revision 1.1
date: 2014/02/27 18:35:18;  author: root;  state: Exp;
Initial revision
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