Hi Hartley, On Wed, Aug 24, 2011 at 01:23:59PM -0500, H Hartley Sweeten wrote: > Hello all, > > I have a question... > > Are there any I2C touchscreen controllers that do not need irq support? > > I have a system with an I2C bus available to connect to the touchscreen > controller but I don't have an IRQ pin available. Right now I'm just > trying to discover if there is a possible solution or if I will need to > modify my board somehow to get an IRQ. Without IRQ you are limited to polling mode which, for touchscreens, needs to be done at fairly high rate to provide adequate responsiveness. This, in turn, will put considerable load on the system thus driving up power requirements... IOW not very suitable for production use, that is why I've been asking people to submit IRQ-driven drivers, if at all possible. If polling is your only option then input-polldev is your friend. -- 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
