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Re: [PATCH 2/2] input: add driver for S1 button of rb532

To: Phil Sutter <>
Subject: Re: [PATCH 2/2] input: add driver for S1 button of rb532
From: Geert Uytterhoeven <>
Date: Sat, 24 Jan 2009 09:34:43 +0100 (CET)
Cc: Dmitry Torokhov <>,, Ralf Baechle <>,, Florian Fainelli <>
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <>
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 unpublished driver for this device.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 --

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

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