linux-kernel - Re: [PATCH 2/6] staging: ft1000: Use misc device instead self created device.

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Message-ID: <AANLkTin6Am=17wyMZJRu9bYk5-QTYqZhGtZqV_sDwJW4@mail.gmail.com>
Date:	Wed, 24 Nov 2010 10:16:36 +0100
From:	Belisko Marek <marek.belisko@...il.com>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] staging: ft1000: Use misc device instead self created device.

On Tue, Nov 23, 2010 at 10:28 PM, Jiri Slaby <jirislaby@...il.com> wrote:
> On 11/23/2010 03:00 PM, Belisko Marek wrote:
>> On Tue, Nov 23, 2010 at 2:53 PM, Jiri Slaby <jirislaby@...il.com> wrote:
>>> On 11/23/2010 01:29 PM, Marek Belisko wrote:
>>>> Use simple misc device for ioctl driver funtionality testing.
>>>>
>>>> Signed-off-by: Marek Belisko <marek.belisko@...n-nandra.com>
>>>> ---
>>>>  drivers/staging/ft1000/ft1000-usb/ft1000_chdev.c |   90 ++++++++++++++++++---
>>>>  1 files changed, 77 insertions(+), 13 deletions(-)
>>>>
>>>> diff --git a/drivers/staging/ft1000/ft1000-usb/ft1000_chdev.c b/drivers/staging/ft1000/ft1000-usb/ft1000_chdev.c
>>>> index 1aec926..d1784a3 100644
>>>> --- a/drivers/staging/ft1000/ft1000-usb/ft1000_chdev.c
>>>> +++ b/drivers/staging/ft1000/ft1000-usb/ft1000_chdev.c
>>>> @@ -32,6 +32,7 @@
>>>>  #include <linux/poll.h>
>>>>  #include <linux/netdevice.h>
>>>>  #include <linux/delay.h>
>>>> +#include <linux/miscdevice.h>
>>>>
>>>>  #include <linux/fs.h>
>>>>  #include <linux/kmod.h>
>>>> @@ -78,6 +79,47 @@ static struct file_operations ft1000fops =
>>>>       .llseek         = no_llseek,
>>>>  };
>>>>
>>>> +struct ft1000_misc_device {
>>>> +     struct miscdevice dev;
>>>> +     int inf_id;
>>>> +};
>>>> +
>>>> +#define FREE_ID (0xFF)
>>>> +
>>>> +/* we support just 3 devices */
>>>> +#define MAX_DEVICE 3
>>>
>>> No, why this should be converted to miscdevice? Leave it as chrdev.
>> Is there any problem with using miscdev?
>
> Yes, if you want more than a single device per system.
>
>> Old interface create /dev nodes with
>> calling kernel thread and some usermode_helper or whatever.
>
> Yes, that's crap indeed. But doesn't judge for miscdevice.
>
>> Just convert to misc dev
>> where this is done automatically.
>
> So the only thing you need to do is to send a uevent to udev appropriately.
Could be used something like:
register_chrdev(0,"ft1000", &fops)
class = class_create(THIS_MODULE, "ft1000");
device_create(class, NULL, MKDEV(major, i), NULL, "ft1000%d", i);
Then will be created different devices for every plugged device.
This should have effect of automatic device node creation also suppose.

>
> regards,
> --
> js
>

thanks,

marek
,
-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

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