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

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Message-ID: <AANLkTimNoTa9GChfDvTH96g_8NgtZFEZYuNOYCisvNvV@mail.gmail.com>
Date:	Wed, 1 Dec 2010 10:35:25 +0100
From:	Belisko Marek <marek.belisko@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Jiri Slaby <jirislaby@...il.com>, devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] staging: ft1000: Use misc device instead self created device.

On Wed, Dec 1, 2010 at 5:06 AM, Greg KH <greg@...ah.com> wrote:
> On Mon, Nov 29, 2010 at 09:08:07PM +0100, Belisko Marek wrote:
>> On Mon, Nov 29, 2010 at 8:44 PM, Greg KH <greg@...ah.com> wrote:
>> > On Wed, Nov 24, 2010 at 10:16:36AM +0100, Belisko Marek wrote:
>> >> 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.
>> >
>> > Please don't create new classes.
>> >
>> > Is this a USB device?  If so, why not just use the USB major number?
>> Yes it is USB device.
>> > Just ask me and I can reserve you a USB minor number for your driver.
>> Idea behind existing code is that for every plugged device you will have created
>> /dev node. NUmber of devices was limited by number of plugged devices.
>> But who will plug more
>> then one device which just used for internet connection? So maybe I
>> should implement some
>> limit and would be nice if you could reserve me some USB minors (lest
>> say max. 3 devices?).
>
> Send me a patch using the USB major number, and I'll add an additional
> one that reserves the proper minor number for your driver.
Patch sent (subject: [PATCH] staging: ft1000: Use usb device registration.)
>
> thanks,
>
> greg k-h
>

thanks,

marek

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