linux-kernel - Re: [PATCH 8/9] Input: Block suspend while event queue is not empty.

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Message-Id: <201004231408.15885.dmitry.torokhov@gmail.com>
Date:	Fri, 23 Apr 2010 14:08:14 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
	Márton Németh <nm127@...email.hu>,
	Sven Neumann <s.neumann@...mfeld.com>,
	Tero Saarni <tero.saarni@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Matthew Garrett <mjg@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org
Subject: Re: [PATCH 8/9] Input: Block suspend while event queue is not empty.

On Friday 23 April 2010 01:56:25 pm Randy Dunlap wrote:
> On Thu, 22 Apr 2010 18:08:57 -0700 Arve Hjønnevåg wrote:
> > Add an ioctl, EVIOCSSUSPENDBLOCK, to enable a suspend_blocker that will
> > block suspend while the event queue is not empty. This allows userspace
> > code to process input events while the device appears to be asleep.
> 
> All new ioctls need to be added to Documentation/ioctl/ioctl-number.txt,
> please.

I do not see the reason for it to be in the kernel still. Have a process
that listens to all input devices (or subset of them), once events stop
coming initiate suspend.

> 
> > Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
> > ---
> > 
> >  drivers/input/evdev.c |   22 ++++++++++++++++++++++
> >  include/linux/input.h |    3 +++
> >  2 files changed, 25 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
> > index 2ee6c7a..66e0d16 100644
> > --- a/drivers/input/evdev.c
> > +++ b/drivers/input/evdev.c
> > @@ -585,6 +594,19 @@ static long evdev_do_ioctl(struct file *file,
> > unsigned int cmd,
> > 
> >  		else
> >  		
> >  			return evdev_ungrab(evdev, client);
> > 
> > +	case EVIOCGSUSPENDBLOCK:
> > +		return put_user(client->use_suspend_blocker, ip);
> > +
> > +	case EVIOCSSUSPENDBLOCK:
> > +		spin_lock_irq(&client->buffer_lock);
> > +		if (!client->use_suspend_blocker && p)
> > +			suspend_blocker_init(&client->suspend_blocker, "evdev");
> > +		else if (client->use_suspend_blocker && !p)
> > +			suspend_blocker_destroy(&client->suspend_blocker);
> > +		client->use_suspend_blocker = !!p;
> > +		spin_unlock_irq(&client->buffer_lock);
> > +		return 0;
> > +
> > 
> >  	default:
> >  		if (_IOC_TYPE(cmd) != 'E')
> > 
> > diff --git a/include/linux/input.h b/include/linux/input.h
> > index 7ed2251..b2d93b4 100644
> > --- a/include/linux/input.h
> > +++ b/include/linux/input.h
> > @@ -82,6 +82,9 @@ struct input_absinfo {
> > 
> >  #define EVIOCGRAB		_IOW('E', 0x90, int)			/* Grab/Release 
device */
> > 
> > +#define EVIOCGSUSPENDBLOCK	_IOR('E', 0x91, int)			/* get 
suspend block
> > enable */ +#define EVIOCSSUSPENDBLOCK	_IOW('E', 0x91, int)			/* 
set
> > suspend block enable */ +
> > 
> >  /*
> >  
> >   * Event types
> >   */
> 
> thanks,
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code
> *** --
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-- 
Dmitry
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