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. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
