linux-kernel - Re: [RFC] Input: implement sysrq as an input handler

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Message-ID: <20100319003054.GA5825@core.coreip.homeip.net>
Date:	Thu, 18 Mar 2010 17:30:54 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Linux Input <linux-input@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: [RFC] Input: implement sysrq as an input handler

On Thu, Mar 18, 2010 at 05:13:35PM -0700, Randy Dunlap wrote:
> On 03/16/10 23:19, Dmitry Torokhov wrote:
> > Instead of keeping SysRq support inside of legacy keyboard driver split
> > it out into a separate input handler (filter). This stops most SysRq input
> > events from leaking into evdev clients (some events, such as first SysRq
> > scancode - not keycode - event, are still leaked into both legacy keyboard
> > and evdev).
> > 
> > Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
> > ---
> > 
> >  drivers/char/keyboard.c |   40 +-------
> >  drivers/char/sysrq.c    |  222 +++++++++++++++++++++++++++++++++++++++++------
> >  include/linux/sysrq.h   |   23 +----
> >  kernel/sysctl.c         |   23 +++++
> >  4 files changed, 224 insertions(+), 84 deletions(-)
> 
> 
> > +/* Simple translation table for the SysRq keys */
> > +static const unsigned char sysrq_xlate[KEY_MAX + 1] =
> > +        "\000\0331234567890-=\177\t"                    /* 0x00 - 0x0f */
> > +        "qwertyuiop[]\r\000as"                          /* 0x10 - 0x1f */
> > +        "dfghjkl;'`\000\\zxcv"                          /* 0x20 - 0x2f */
> > +        "bnm,./\000*\000 \000\201\202\203\204\205"      /* 0x30 - 0x3f */
> > +        "\206\207\210\211\212\000\000789-456+1"         /* 0x40 - 0x4f */
> > +        "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
> > +        "\r\000/";                                      /* 0x60 - 0x6f */
> 
> We are running out of these precious sysrq keys.
> Do you have any ideas of how to have a larger xlate table?
> 

When we run out we could add shift modifiers I guess.

-- 
Dmitry
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