Re: The way for disabling input device?

[Joonyoung Shim <jy0922.shim@samsung.com>]

On 2011-03-16 오후 1:55, Dmitry Torokhov wrote:
> On Tue, Mar 15, 2011 at 06:06:26PM +0900, Joonyoung Shim wrote:
>> Hi, all.
>>
>> The many smartphones and embedded devices have LCD panel with
>> touchscreen. The LCD panel is turned off for power saving and
>> touchscreen also is disabled if there isn't user input for a while or if
>> user presses power key briefly. This state is such idle, not suspend.
>>
>> The framebuffer device driver of kernel supplies sysfs interface to
>> control blanking level of framebuffer and  we can turn off LCD panel
>> using this sysfs at the above case.
>>
>> Currently i know there isn't the generic way for disabling input device
>> via user interface, so i am looking for the way for disabling
>> input device on kernel side for above case.
>>
>> The above case has a condition which the touchscreen is disabled if LCD
>> panel is turned off. The framebuffer framework of kernel has notifier
>> block to callback on events like hardware display blank change occured,
>> so the callback function disabling and enabling input device can be
>> called using notifier block of framebuffer. The callback function is
>> implemented in each touchscreen driver or can be implemented though
>> input core if this can be generic way for input device.
>>
>> Actually i wonder whether this approach makes sense. I know this is a
>> specific case but certainly necessary function in the smartphone and
>> embedded devices.
>
> I do not believe that we should tie the 2 together. I can come up with
> scenarios where you woudl want to put the keeboard/touchcsreen to sleep
> before turning off the display and vice versa.

Right, as you say, various scenarios can come up, so i think generic way 
for disabling input device needs more and more.
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