On Thu, 22 Jan 2009, Phil Sutter wrote:
> Mikrotik's Routerboard 532 has two builtin buttons, from which one
> triggers a hardware reset. The other one is accessible through GPIO pin
> 1. Sadly, this pin is being multiplexed with UART0 input, so enabling it
> as interrupt source (as implied by the gpio-keys driver) is not possible
> unless UART0 has been turned off. The later one though is a rather bad
> idea as the Routerboard is an embedded device with only a single serial
> port, so it's almost always used as serial console device.
> This patch adds a driver based on INPUT_POLLDEV, which disables the UART
> and reconfigures GPIO pin 1 temporarily while reading the button state.
> This procedure works fine and has been tested as part of another,
> unpublished driver for this device.
What happens when you receive UART input while the UART is disabled? Is it
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- email@example.com
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds