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75929f5e2b
This patch adds EV_KEYs for each of the 8 pushbuttons on the UI board via a gpio-key device. The expander is a tca6416; it controls the SEL_{A,B,C} lines which enable and disable the peripherals found on the UI board in addition to the 8 pushbuttons mentioned above. The reason the existing tca6416-keypad driver is not employed is because there was no aparent way to keep the gpio lines used as SEL_{A,B,C} registered while simultaneously registering the pushbuttons as a tca6416-keypad instance. Some experimentation with the polling interval was performed; we were searching for the largest polling interval that did not affect the feel of the responsiveness of the buttons. It is very subjective but 200ms seems to be a good value that accepts firm pushes but rejects very light ones. The key values assigned to the buttons were arbitrarily chosen to be F1-F8. Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca> Reviewed-by: Chris Cordahi <christophercordahi@nanometrics.ca> CC: Govindarajan, Sriramakrishnan <srk@ti.com> Reviewed-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com> CC: Kevin Hilman <khilman@deeprootsystems.com> CC: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> |
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