i have just started working on USB myDev Device Drivers. I have some
Problem with DevFS.would u pls help me... this driver compiles
successfully and runs successfully but i m unable to create dir using
devfs_mk_dir and register with defs_register. I have also read rubini's
book and ur documentation on "writing usb device drivers" but unable to
find error. I m using RH9.0 and kernel version 2.4.
This Code is like this :
1. Header Files :
#define MODULE
#define __KERNEL__
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/config.h>
#include <linux/fcntl.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
2. static struct file_operations myDev_fops = {
owner: THIS_MODULE,
read: myDev_read,
write: myDev_write,
ioctl: myDev_ioctl,
open: myDev_open,
release: myDev_release,
};
3. static struct usb_driver myDev_driver = {
name: "Sigmatel_myDev_driver",
probe: myDev_probe,
disconnect: myDev_disconnect,
fops: &myDev_fops,
minor: USB_myDev_MINOR_NO,/*200*/
id_table: myDev_table,
};
4. extern devfs_handle_t usb_devfs_handle;
devfs_handle_t myDev_devfs_dir;
5. static void* myDev_probe(struct usb_device *udev, unsigned int ifnum,
const struct usb_device_id *id)
{
struct usb_myDev *dev = NULL;
.
.
.
.
int buffer_size;
int i;
char name[10]; /*Name of the node using devfs*/
.
.
.
.
.
.
/* initialize the devfs node for this device and register it */
/*sprintf(name, "USBmyDev");*/
/******************** Commented section ********************
USB_MAJOR is defined as 180 in usb.h*/
/*
dev->devfs=devfs_register(NULL,"usbmyDev",
DEVFS_FL_DEFAULT, USB_MAJOR,
200,
S_IFCHR | S_IRUSR | S_IWUSR |
S_IRGRP | S_IWGRP | S_IROTH,
&myDev_fops, dev);
/***********************************************************/
myDev_devfs_dir=devfs_mk_dir(NULL,"usbmyDev",NULL);
if(!myDev_devfs_dir)
{
info("unable to make directory");
}
usb_devfs_handle = devfs_register(myDev_devfs_dir, "usbmyDev",
DEVFS_FL_AUTO_DEVNUM,0,0,
S_IFCHR | S_IRUGO | S_IWUGO,
&myDev_fops, NULL);
dev->devfs=usb_devfs_handle;
/* let the user know what node this device is now attached to */
if(dev->devfs > 0)
{
info("Yes Registered...");
}
else
{
info("Error Occured...");
}
info("Sigmatel's USB myDev device now attached to USBmyDev");
goto exit;
error:
myDev_delete(dev);
dev = NULL;
exit:
return dev;
}
---------------- End Of Code -------------------
Would u pls specify what is the problem?
regards,
navtez
-----------------------------------------
Baba Banda Singh Bahadur Engineering College
Fatehgarh Sahib, Punjab, India
http://www.bbsbec.ac.in
http://www.bbsbec.org
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