LED notification

Andy Green andy at openmoko.com
Sat Oct 11 13:20:46 CEST 2008

Hash: SHA1

Sam Kuper wrote:
> 2008/10/9 Andy Green <andy at openmoko.com <mailto:andy at openmoko.com>>
>     Robert Norton wrote:
>     > 2008/10/9 Robin Paulson <robin.paulson at gmail.com
>     <mailto:robin.paulson at gmail.com>>:
>     >> the main cpu is suspended, like in the neo, but the power
>     management unit is not
>     > I'm sure I recently read a datasheet for a PMU which supported various
>     > flash patterns for LEDs even during suspend. Unfortunately I can't
>     Not really a PMU but an i2c device for just doing that.  We might be
>     using one or another in future products
> To me, having the phone able to perform basic notification functions
> (LED blink, vibrate, make a sound) on certain events, even when the
> phone is on standby, seems like a very desirable - not to say obvious -
> feature.

Well you can simply wake and do "event" type actions like vibrate and
flash LEDs then, the stimulus you are responding to like incoming call
will be a CPU wake event so that lot will work.

What can't be done (because of a completely Linux-centric POV in the
design) is anything while the CPU is off in suspend.  We can leave a LED
on during suspend, but there is no intelligence to flash it or whatever.

So overall it's not quite as bad as it sounded I hope.

- -Andy
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