Wake up from sleep with GPIO (I2C)

Posted by spambas on Ask Ubuntu See other posts from Ask Ubuntu or by spambas
Published on 2012-09-06T14:14:47Z Indexed on 2012/09/06 15:50 UTC
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Filed under:

10.10

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sleep

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input-devices

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wakeup

My situation:

Ubuntu 10.10 running on an atom driven main board
the main board has a GPIO chip integrated (F75111 by Fintek).

They communicate through I2C(SMBus). We have a driver running that works, we can send outputs and read inputs. Great!

We would like to use the I/O interface to suspend (sleep) and wake up again.

Sleep is no problem. On an incoming input: run s2both. Ubuntu goes to sleep and prepares a hibernate state, so when the power-cord is unplugged by accident, it will wake from hibernate.

But the big question: how to wake on an input if the OS is already sleeping! You can wake from a lot of devices (lan, usb, ring, etc) but I can't find out how to wake from a I2C card.

PLEASE HELP!

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