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    iio: st_sensors: support active-low interrupts · a9fd053b
    Linus Walleij 提交于
    Most ST MEMS Sensors that support interrupts can also handle sending
    an active low interrupt, i.e. going from high to low on data ready
    (or other interrupt) and thus triggering on a falling edge to the
    interrupt controller.
    
    Set up logic to inspect the interrupt line we get for a sensor: if
    it is triggering on rising edge, leave everything alone, but if it
    triggers on falling edges, set up active low, and if unsupported
    configurations appear: warn with errors and reconfigure the interrupt
    to a rising edge, which all interrupt generating sensors support.
    
    Create a local header for st_sensors_core.h to share functions
    between the sensor core and the trigger setup code.
    
    Cc: Giuseppe Barba <giuseppe.barba@st.com>
    Cc: Denis Ciocca <denis.ciocca@st.com>
    Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
    Signed-off-by: NJonathan Cameron <jic23@kernel.org>
    a9fd053b
st_magn_core.c 18.9 KB