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refactor(kscan): batch GPIO reads by port

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Changed the GPIO matrix and direct GPIO key scan drivers to do a single
read per port instead of one read per pin. This is much more efficient
for some types of GPIO drivers, such as I2C GPIO expanders.

To accomplish this with minimal overhead, we now sort input pins by port
at driver init. if we iterate through the pins in the sorted order, all
pins on the same port are consecutive, so we only need to read each port
once the first time we see it.
This commit is contained in:
Joel Spadin
2022-12-06 00:13:01 -06:00
committed by Pete Johanson
parent 1adfcf92bf
commit b276a3bfb0
5 changed files with 188 additions and 89 deletions
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1
app/drivers/kscan/CMakeLists.txt
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@@ -5,6 +5,7 @@ zephyr_library_named(zmk__drivers__kscan)
zephyr_library_include_directories(${CMAKE_SOURCE_DIR}/include)
zephyr_library_sources_ifdef(CONFIG_ZMK_KSCAN_GPIO_DRIVER debounce.c)
zephyr_library_sources_ifdef(CONFIG_ZMK_KSCAN_GPIO_DRIVER kscan_gpio.c)
zephyr_library_sources_ifdef(CONFIG_ZMK_KSCAN_GPIO_MATRIX kscan_gpio_matrix.c)
zephyr_library_sources_ifdef(CONFIG_ZMK_KSCAN_GPIO_DIRECT kscan_gpio_direct.c)
zephyr_library_sources_ifdef(CONFIG_ZMK_KSCAN_GPIO_DEMUX kscan_gpio_demux.c)