Date: Fri, 9 Apr 2010 08:58:32 -0400
From: Jarod Wilson <jarod@redhat.com>
To: Andy Walls <awalls@radix.net>
Cc: James Hogan <james@albanarts.com>,
       Mauro Carvalho Chehab <mchehab@redhat.com>,
       Jon Smirl <jonsmirl@gmail.com>, Pavel Machek <pavel@ucw.cz>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       Krzysztof Halasa <khc@pm.waw.pl>,
       hermann pitton <hermann-pitton@arcor.de>,
       Christoph Bartelmus <lirc@bartelmus.de>, j@jannau.net,
       jarod@wilsonet.com, kraxel@redhat.com, linux-input@vger.kernel.org,
       linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
       superm1@ubuntu.com
Subject: Re: [RFC] What are the goals for the architecture of an in-kernel IR
 system?
Message-ID: <20100409125832.GA22814@redhat.com>
References: <9e4733910912060952h4aad49dake8e8486acb6566bc@mail.gmail.com>
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 <4BAB7659.1040408@redhat.com>
 <201004090821.10435.james@albanarts.com>
 <1270810226.3764.34.camel@palomino.walls.org>
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On Fri, Apr 09, 2010 at 06:50:26AM -0400, Andy Walls wrote:
> On Fri, 2010-04-09 at 08:21 +0100, James Hogan wrote:
> > Hi,
> > 
> > On Thursday 25 March 2010 14:42:33 Mauro Carvalho Chehab wrote:
> > > Comments?
> > 
> > I haven't seen this mentioned yet, but are there any plans for a sysfs 
> > interface to set up waking from suspend/standby on a particular IR scancode 
> > (for hardware decoders that support masking of comparing of the IR data), kind 
> > of analagous to the rtc framework's wakealarm sysfs file?
> 
> This requires support at the hardware level.  (You can't have CPU code
> running to decode IR pulses when your CPU is "asleep".)
> 
> I know of two video chips supported under linux that provide such a
> function.
> 
> Wake-up from IR for these chips will rely on the kernel PCIe or USB
> infrastructure supporting PCIe or USB Power Managment Events from
> hardware.  It will take a huge amount of work and time to get the
> respective linux video drivers to properly support suspend/resume
> properly.
> 
> If you're waiting for me to get that working, I'll advise you to plan on
> getting off the couch and pushing the power switch for some time to
> come. ;)
> 
> 
> 
> 
> The MCE-USB, I *speculate*, can perform wakes.  It's driver would need
> to support that, if it can.

Yep, it can perform wakes, and the current lirc_mceusb does support it,
though it requires some screwing around with echoing something into
somewhere in sysfs (for the usb controller its attached to) to enable it,
from what I recall... Making it Just Work would be a good idea.

-- 
Jarod Wilson
jarod@redhat.com

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