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    SubjectRe: [RFC][PATCH] input: Introduce device information ioctl
    On 12/07/2010 10:16 AM, Dmitry Torokhov wrote:

    > Hi Henrik,
    > On Tue, Dec 07, 2010 at 08:25:26AM +0100, Henrik Rydberg wrote:
    >> Today, userspace sets up an input device based on the data it emits.
    >> This is not always enough; a tablet and a touchscreen may emit exactly
    >> the same data, for instance, but the former should be set up with a
    >> pointer whereas the latter does not need to. Recently, a new type of
    >> touchpad has emerged where the buttons are under the pad, which changes
    >> handling logic without changing the emitted data. This patch introduces
    >> a new ioctl, EVIOCGDEVINFO, which allows userspace to extract information
    >> about the device resulting in proper setup.
    > If we agree that the new ioctl is suitable we'llalso need to wireit up
    > through sysfs. Also, can we keep all definitions to INPUT_ namespace?
    > Thanks.

    Thanks all for the comments, this is what I extract from them:

    * Split struct into separate calls, although this still seems debated.

    * Use INPUT_ namespace

    * Add sysfs version

    * Keep bitmask for types. Is the list of types complete?

    * Still only one data point for capabilities. Anything else?

    Sounds about right?


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