drivers: input: add an analog-axis driver #66600
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Add an input driver to read data from an analog device, such as a thumbstick, connected to an ADC channel, and report it as an input device. Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
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(merge conflict, rebased). |
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Last installment (maybe) of the general purpose input drivers. This is for a generic thumbstick style device connected to an ADC to report as an absolute position input device. Been running the original version of this on one of my toy projects (predating the input subsystem), just finished making it generic, I think it'd be a great addition to the project.
The calibration factors and deadzone in the devicetree are just an initial value stored in RAM, there's an API for overwriting those as well as saving them with the settings subsystems. If saved, they are loaded at boot time automatically.
The deadzone is optional, as it's only needed for a self centering device, for a return to zero device one can just change the limits.
I'll follow up with a shell command and power management down the road, but this is big and functional enough for now.
Add an input driver to read data from an analog device, such as a thumbstick, connected to an ADC channel, and report it as an input device.