• Danilo Krummrich's avatar
    Input: PS/2 gpio bit banging driver for serio bus · 9ee0a055
    Danilo Krummrich authored
    This driver provides PS/2 serio bus support by implementing bit banging
    with the GPIO API. The GPIO pins, data and clock, can be configured with
    a node in the device tree or by generic device properties (GDP).
    
    Writing to a device is supported as well, though it is possible timings
    can not be halt as they are tough and difficult to reach with bit banging.
    Therefore it can be configured (also in DT and GDP) whether the serio
    write function should be available for clients.
    
    This driver is for development purposes and not recommended for productive
    use. However, this driver can be useful e.g. when no USB port is available
    or using old peripherals is desired as PS/2 controller chips getting rare.
    
    This driver was tested on bcm2825 and on Kirin 960 and it worked well
    together with the atkbd and psmouse driver.
    Signed-off-by: default avatarDanilo Krummrich <danilokrummrich@dk-develop.de>
    Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
    Acked-by: default avatarRob Herring <robh@kernel.org>
    Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
    9ee0a055
ps2-gpio.c 10.6 KB