linux-kernel - Re: [PATCH] rfkill: core: add custom rfkill switch

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Date:	Fri, 26 Mar 2010 21:43:19 +0530 (IST)
From:	Pavan Savoy <pavan_savoy@...oo.co.in>
To:	Johannes Berg <johannes@...solutions.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rfkill: core: add custom rfkill switch

--- On Fri, 26/3/10, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:

> From: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Subject: Re: [PATCH] rfkill: core: add custom rfkill switch
> To: "Johannes Berg" <johannes@...solutions.net>
> Cc: "Pavan Savoy" <pavan_savoy@...oo.co.in>
> Date: Friday, 26 March, 2010, 12:28 PM
> On Thu, Mar 25, 2010 at 11:39:10PM
> -0700, Johannes Berg wrote:
> > On Thu, 2010-03-25 at 23:23 -0700, Dmitry Torokhov
> wrote:
> > 
> > > > I do have an actual driver it's just that
> all 3 cores are controlled
> > > > by 1 chip_enable and individual cores are
> powered up down by s/w
> > > > commands.
> > > > 
> > > 
> > > Hmm, so the main portion of the driver needs to
> count the number of
> > > active users across rfkill interfaces 
> before powering down the chip. I
> > > do not quite understand what the issue is
> here...
> > 
> > He also wants to (ab)use rfkill to signal to userspace
> what the value of
> > that counter is ...
> > 
> 
> Well, this one is easy - just say 'No' ;)
> 
> -- 
> Dmitry

Well, Almost, I don't want to signal the user-space about the counter.
Have a look @ http://lkml.org/lkml/2010/3/24/303

See the kernel space (bluetooth driver) would register itself, to my line discipline driver, when someone does a 'hciconfig hci0 up' which is essentially BT-On.

So, now from my ldisc driver (which intends to mux BT/FM and GPS over UART), I need to signal a user-space daemon to open the TTY device, set the baud rate and install the ldisc - So I can make use of it.

To notify that user-space daemon, I had planned to use /dev/rfkill.
However, now with BT application also toggling the rfkill switch by writing to sysfs entry - is causing a bit of confusion to my user-space daemon.

Although I now use hard/soft members of struct rfkill_event now to differentiate the 2 events (1 auto generated, another from BT app) - This patch would make it a bit more proper.

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