linux-kernel - Re: [PATCH] Input: drivers/joystick: use parallel port device model

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Date:	Mon, 3 Aug 2015 14:26:48 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH] Input: drivers/joystick: use parallel port device model

On Saturday 01 August 2015 18:13:48 Sudip Mukherjee wrote:
> On Fri, Jul 31, 2015 at 01:43:06PM -0700, Dmitry Torokhov wrote:
> > On Fri, Jul 31, 2015 at 01:36:18PM -0700, Greg KH wrote:
> > > On Fri, Jul 31, 2015 at 11:04:26PM +0530, Sudip Mukherjee wrote:
> > > > On Fri, Jul 31, 2015 at 09:54:27AM -0700, Dmitry Torokhov wrote:
> > > > > On Fri, Jul 31, 2015 at 03:45:25PM +0530, Sudip Mukherjee wrote:
> > > > > > On Thu, Jul 30, 2015 at 09:53:23AM -0700, Dmitry Torokhov wrote:
> > > > > > > Hi Sudip,
> > > > > > Hi Dmitry,
> > > > > > > 
> > > > > > > On Thu, Jul 30, 2015 at 07:36:34PM +0530, Sudip Mukherjee wrote:
> <snip>
> > > > > 
> > > > > No, unfortunately I do not.
> > > > > 
> > > > > Since neither of us can test the change what is the benefit of doing the
> > > > > conversion? What will be gained by doing it? Are there plans for parport
> > > > > subsystem to remove the old style initialization?
> > > > Yes, that is the plan. Well, if you are not comfortable with introducing
> > > > attach and detach functions then this can be done in another way where
> > > > there will be very minimum change in the code. But I will prefer to have
> > > > attach and detach then it can take advantage of the hotplug feature.
> > > > Adding Greg in To: list for his comments.
> > > 
> > > Converting to the "new" api is the end goal here, no need to keep the
> > > old one around anymore.
> > 
> > OK, then I guess we can do the conversion right (dropping db9_base
> > module-global) and see if anyone screams at us.
> I am working on it now to remove db9_base. But in the detach callback we
> will get struct parport * and from parport to get a pardevice we need to
> get it from port->physport->devices. Since it is having PARPORT_FLAG_EXCL
> it is ok, but should we really depend on and work with the internal data
> structures of the parport rather than working with the exported api?
> 
> regards
> sudip
> --
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> 
> 

Hey! I believe you are not going to break my Atari joystick connected to
my desktop PC via special homemade reduction for parallel port... :-)
That Atari joystick uses db9.ko linux kernel driver and so any untested
changes to db9.c could break functionality!

-- 
Pali Rohár
pali.rohar@...il.com
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