The book of linux device driver says register_chrdev will go away and do not use it.
Do you mean misc_register only can handle one device? For example, there are several wifi devices, misc_register can only deal one of them not all?
--- On Thu, 6/18/09, Jiri Slaby <jirislaby at gmairl.com> wrote:
> From: Jiri Slaby <jirislaby at gmail.com>
> Subject: Re: char driver
> To: "hong zhang" <henryzhang62 at yahoo.com>
> Cc: devel at linuxdriverproject.org
> Date: Thursday, June 18, 2009, 4:32 PM
> On 06/18/2009 10:51 PM, hong zhang
> wrote:
> > I want to create a char driver but there are cdev,
> register_chrdev and misc_register interfaces in 2.6 kernel.
> "Linux device driver" recommends cdev.
>
> misc driver registers only one device/minor. I don't know
> what you mean
> by cdev (all are cdevs), but you should use dynamic major
> allocator,
> i.e. alloc_chrdev_region and add devices via cdev_add
> later.
> register_chrdev can alloc a dynamic major too, but adds all
> 256 minors
> at once.
>
