• Johan Hovold's avatar
    gnss: add driver for sirfstar-based receivers · d2efbbd1
    Johan Hovold authored
    Add driver for serial-connected SiRFstar-based GNSS receivers.
    
    These devices typically boot into hibernate mode from which they can be
    woken using a pulse on the ON_OFF input pin. Once active, a pulse on the
    same ON_OFF pin is used to put the device back into hibernate mode. The
    current state can be determined by sampling the WAKEUP output.
    
    Hardware configurations where WAKEUP has been connected to ON_OFF (and
    where an initial WAKEUP pulse during boot is sufficient to have the
    device boot into active mode) are also supported. In this case, device
    power is managed using the main-supply regulator only.
    
    Note that configurations where WAKEUP is left not connected, so that the
    device power state can only indirectly be determined using the I/O
    interface, is currently not supported. It should be fairly
    straight-forward to extend the current implementation with such support
    however (and this this is the main reason for not using the generic
    serial implementation for this driver).
    
    Note that timepulse-support is left unimplemented.
    Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    d2efbbd1
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