Re: [PATCH v2 1/4] gpiolib: Add "unknown" direction support

[Wolfram Sang]

> We had exported our 5V_enable gpio to sysfs to allow a user-space application 
> to enable/disable devices connected to 5V circuit.
> But on the other hand we had to read the current status of this gpio in the 
> power-fail interrupt handler to distinguish between false-positive (5V 
> disabled) and a correct detection.

What about gpio_export() (description in Documentation/gpio.txt)?

Regards,

   Wolfram

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Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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