On Mon, 2005-05-30 at 14:20 +0530, Vishal Linux wrote:
> Hi all,
>
>
> I am trying to associate a driver to the '/dev/mem' device (the major
> no. and minor no. of device is 1,1.)
>
> [vishal@vishalsoni ~]$ ll /dev/mem
> crw-r----- 1 root kmem 1, 1 May 30 2005 /dev/mem
>
> so that any read/write/mmap happening to this device.. gives control
> to my driver.
> I am able to Successfully register the device ( dmesg tells this) &
> below is the code for kernel 1.6 driver.
>
> [vishal@vishalsoni ~]$ uname -a
> Linux vishalsoni 2.6.9-1.667 #1 Tue Nov 2 14:41:25 EST 2004 i686 i686
> i386 GNU/Linux
>
> int LinuxTestMemDevice_init(void)
> {
> int rv = -1;
> int devno = MKDEV(1,1);
> struct cdev my_cdev;
> printk("Skelton Driver, version %s\n", DRIVER_VERSION);
> my_cdev.owner=THIS_MODULE;
> my_cdev.ops =&my_fops;
> rv = cdev_add(&my_cdev,devno,1);
> if(rv) {
> printk(" Error in registering the char device\n");
> return -1;
> }
> else {
> printk(" :------------- Succesfully registered the device -----------
> \n");
> printk(" : Major no. of device is :: %d\n",MAJOR(devno));
> printk(" : Minor no. of device is :: %d\n",MINOR(devno));
> }
>
> return 0;
> }
>
> Registration is successful.......
> Now when i try to do [vishal@vishalsoni ~]$ cat /dev/mem
> my implementation of open does not get called.
>
> As a test.. i have written, just one line code.
>
> static int my_open(struct inode *imem, struct file *fmem)
> {
> printk(" INSIDE my_open ..................\n");
> return 1;
> }
>
> Where am i going wrong !!!!!! Your inputs would be greatly appreciated
Hey! wait a minute.....forget my previous reply.
where are you registering your open fxn. in the fops struct???
(I'm assuming you have shown us your complete code)
Your open is not going to get called automagically! :)
>
>
> Thank you,
> Regards,
> Vishal.
>
>
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