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* udev 092 with kernel 2.6.10?  (version neutral simple api)
@ 2007-03-02 17:34 Leisner, Martin
  2007-03-02 20:21 ` Greg KH
  2007-03-02 20:23 ` Greg KH
  0 siblings, 2 replies; 3+ messages in thread
From: Leisner, Martin @ 2007-03-02 17:34 UTC (permalink / raw)
  To: linux-hotplug

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After a number of gyrations, I got udev 092 working with 2.6.10 (and it
looks like its
working pretty good).

After running a number of udevs I found newer udevs have improved
logging/debugging 
facility over older udevs.  I found udevmonitor to be very useful.

Can someone explain why the API changed between various kernel versions?
(i.e. removed class_simple).

I wrapped the api changes into a header file and I ported some of the
ldd3 examples to udev...
I have a little tutorial on udev to pass around at work...

Writing device drivers to use udev seems very easy...but I had a great
deal of difficulty finding
a cookbook approach to "making udev work".

I found Dave Hawkins paper  at
http://www.ovro.caltech.edu/~dwh/correlator/pdf/LNX-723-Hawkins.pdf
very useful.

marty

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#ifndef CLASS_H
#define CLASS_H




/* This is from Dave Hawkins dwh@ovro.caltech.edu
 * simple_driver.c
 *
 *
 *  2.6.9                       2.6.13
 *  class_simple_create         class_create
 *  class_simple_destroy        class_destroy
 *  class_simple_device_add     class_device_create
 *  class_simple_device_remove  class_device_destroy
 *
 * the only arguments that change are those to
 * class_device_destroy relative to class_simple_device_remove
 *
 * The APIs are not compatible, i.e., you have to use the
 * class_simple API in kernels earlier than 2.6.13.
 * You can test the compatibility in earlier kernels by
 * simply defining LINUX_VERSION_CODE to be KERNEL_VERSION(2,6,13)
 * and the driver will select the new API. The new API fails to
 * compile in the Centos 4.1 2.6.9-11 kernel.
 *
 * Kernel 2.6.14 added another argument to class_device_create.
 * ppdev.c sets it to NULL, so we can too.
 */


#include <linux/version.h>
#include <linux/module.h>
#include <linux/device.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)

typedef struct class_simple Device_class;

#define device_class_create(owner, name)	class_simple_create(owner, name);
#define device_class_add(class, devno, fmt, ...) class_simple_device_add(class, devno, NULL, fmt, ##__VA_ARGS__)

#define device_class_destroy(class)			class_simple_destroy(class)
// #define device_class_device_destroy(class, devno)	class_simple_device_remove(devno)

static inline void device_class_device_destroy(Device_class *class, int devno)
{
	class_simple_device_remove(devno);
}

#else
typedef struct class Device_class;

#define device_class_create(owner,name)		class_create(owner, name)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)

#define device_class_add(class, devno, fmt,...) class_device_create(class , devno, NULL, fmt, ##__VA_ARGS__)

#else
#define device_class_add(class, devno, fmt, ...) class_device_create(class, NULL, devno, NULL, fmt, ##__VA_ARGS__)
#endif

#define device_class_device_destroy(class, devno)	class_device_destroy(class, devno)
#define device_class_destroy(class)			class_destroy(class)

#endif


#endif



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2007-03-02 17:34 udev 092 with kernel 2.6.10? (version neutral simple api) Leisner, Martin
2007-03-02 20:21 ` Greg KH
2007-03-02 20:23 ` Greg KH

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