On Sat, 25 Aug 2007, Yan Burman wrote: >> Aha, /sys. Could we simply power off the device when its input device >> is not opened? >> > No, we can't since the sys interface provides the position info and some > applications (hdaps apps for example) use this interface.
Power it off when not used for some time. Power on when opened. -EBUSY while powering on and before it stablizes, if you don't want to get anything userland stuck in D state. This much work might not make sense if your accelerometer doesn't waste resources when enabled. Heck, try to get rid of that position sysfs crap if you can! It was a bad design idea for hdaps to come up with, there is no reason to let it leak to other drivers. Input devices are the way to go for this, a joystick-emulation input device (for games and toys), plus a input device that outputs accelerometer data in micro (or mili?) gravities (generic stuff that works with all accelerometers should use this one) and a raw accelerometer data input device (for higly specific signal processing apps) when possible. HDAPS (the one that matters, which ships in tp_smapi) lacks the g-normalized device, though, but it would be a proper generic accelerometer interface. The in-tree hdaps driver is basically ignored. So some other accelerometer driver gets the dibs on how to implement those interfaces in a proper generic way. Want to be the one? Please? We in hdaps-devel can certainly help with ideas and fix out-of-tree hdaps to also implement the interface. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
