We have now (or we are about to have, anyway) two drivers that export accelerometer data: IBM's HDAPS, and Apple's AMS. More accelerometer drivers could be coming in the future. Both drivers export one common set of data (accelerometer output), and some extra information that is not related to acellerometers. Both have at least two functionality goals in common: to export accelerometer data to userspace, and also to allow somehow for HD head parking when the accelerometer detects a potentially incoming impact. User?space utilities that interface to accelerometers like hdapsd and smackpad could benefit from a common interface, so that they work with HDAPS, AMS, and any other future accelerometer drivers. If any kernel-space functionality needed by HDAPS and AMS is also shared, we would have benefits there too. Some examples I can think of are: generic HD queue-freeze and HD head parking, and a generic acellerometer-driven joystick event interface. This would also enable generic userspace notifiers that the HD heads have been parked, etc. I am posting this message as a head's up for the two projects (HDAPS, AMS) to make sure that they are actively aware of each other. I do so in hope that we can work in a joint, generic interface and port both drivers to this new interface in the near future, and also that we can make as much functionality shared between the two drivers as possible. -- "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
