linux-kernel - Re: [RFC] Add Input IOCTL for accelerometer devices

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 16 May 2009 05:19:33 +0100
From:	Mohamed Ikbel Boulabiar <boulabiar@...il.com>
To:	felipe.balbi@...ia.com
Cc:	Trilok Soni <soni.trilok@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Jonathan Cameron <jic23@....ac.uk>
Subject: Re: [RFC] Add Input IOCTL for accelerometer devices

On Fri, May 15, 2009 at 9:02 PM, Felipe Balbi <felipe.balbi@...ia.com> wrote:

> Yeah, let's try to define the best way to expose accelerometers with
> linux kernel and avoid a sysfs hell. Better sooner than later.

isn't the best way to add a thing like the one for battery for any input device
/proc/acpi/battery/CMB0/state
or even in /sys/input/devices/XXXX

and let any userspace application do what she wants with information ?

> The problem is that it doesn't really seem to me that all accelerometers
> will be doing hw monitoring. The ones used in laptops, for sure, trying
> to prevent the hd from drying during a fall. But imagine the
> accelerometers used in, say, wii-mote, or cellphones, or such stuff ?

Many of them are HID devices (99%), so can be treated the same way
according the standard.

> Say we wanna use the accelerometer for both screen rotation and gaming,
> that device isn't doing hw monitoring and still we _do_ want to set
> different thresholds and irq requests/types for different use cases,
> right ?

Another reason for preparing the interface I just cited.

> I'll grep around the Industrial IO patchset if that's supposed to a
> 'sensor fw' sorta thing. Hope it does report the devices as input
> devices. I'm pretty sure we're gonna fall into similar issues when
> dealing with magnetometers, for instance, what's the best way to expose
> those device with current linux frameworks ? It's not really user input
> data...
>
> Well, let's see where this discussion takes us. Willing to hear from
> Jonatha, Dmitry and all of you guys

Yes guys, I also wait for your comments :)


ikbel
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/