On Tue, Jul 05, 2005 at 07:39:49PM +0530, Jayaprakash Shanmugam wrote:
> Thanks for your reply. I just wanted to give some more information on
> my requirement.
>
> 1) In my driver (working in 2.4), I have fixed minor numbers for the
> USB cards (custom devices). While reading or writing, I simply do the
> following:
>
> MyCard = MINOR (pstFilp->f_dentry->d_inode->i_rdev);
> if (MyCard == 64)
> {
> MyDevice = usb_find_device(MyCardVID, MyCardPID);
> usb_control_msg();
> }
> else if ()
> ......
>
> But if I use usb_register_dev(), it assigns the minors dynamically and
> no way ( as far as I know ) I can get which device ( I have four
> devices and I am sure that they will not have PIDs in common ) the
> read / write is operating on.
You can check the minor number when you register the device. It is
returned in the structure after usb_register_dev() is called.
> 2) For your reply:
>
> It is our own control system - both the host and devices. These are
> the only devices that can go and plug into the host's USB port.
> There cannot be two boards with same VID / PID pair.
>
> 3) Can I use devfs_register in 2.6 kernel ? The /proc/kallsyms doesnt
> display this symbol. I tried using devfs_mk_cdev() in probe. But I
> got "No Such Device" while opening.
devfs is gone in the latest 2.6 kernel, so no, you can't use it.
Good luck,
greg k-h
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