Switch to indicate ebook mode

[Bert Freudenberg]

On Dec 18, 2006, at 18:23 , Jordan Crouse wrote:

> On 18/12/06 17:53 +0100, Bert Freudenberg wrote:
>> On Dec 18, 2006, at 17:35 , Jordan Crouse wrote:
>>
>>> On 17/12/06 20:50 +0000, Chris Ball wrote:
>>>>>> On Sun, 17 Dec 2006 13:05:52, Dan Williams <dcbw at redhat.com>  
>>>>>> said:
>>>>
>>>>> I can't remember if I ever got a straight answer on this.  Is  
>>>>> there
>>>>> a switch somewhere that we can access that indicates whether or  
>>>>> not
>>>>> the laptop has been swiveled into ebook mode?
>>>>
>>>> This is <http://dev.laptop.org/ticket/467>.
>>>>
>>>>> Ideally, the switch would generate an interrupt which we could
>>>>> receive and automatically rotate the X display and switch to B&W
>>>>> mode when the keyboard is hidden [1].  It's not a great experience
>>>>> to have to expose a toggle somewhere if we can't figure out when
>>>>> we're in ebook mode, especially if we had to rely on activities to
>>>>> provide that toggle in their own UI.
>>>>
>>>> Yeah, it looks like we have the bit, but we don't want to poll  
>>>> it and
>>>> Quanta are blocking on us working out an interface for interrupts,
>>>> as in
>>>> <http://dev.laptop.org/ticket/224>.  Could we get someone to own
>>>> that?
>>>
>>> This reminds me - I've been meaning to ask how the switches
>>> actually work.
>>> There are two of them - one with the output marked PWR_BUT_in and
>>> the other
>>> with the output marked EB_MODE.  I understand from the product
>>> datasheets
>>> that these are Hall Effect sensors, which in effect detect the
>>> presence
>>> of a magnetic field nearby.  Sensor one (PWR_BUT_in) is located  
>>> on the
>>> LCD side of the board at the top right near the notch.  Sensor two
>>> (EB_MODE) is located on the processor side in the same location.   
>>> From
>>> the position of sensor 1, I am assuming that it detects a lid
>>> opening, and
>>> the magnetic field is located in the base.  I can't at all figure
>>> out where
>>> the magnet is for sensor 2, nor how it detects EB mode.
>>>
>>> So - long story short, where the heck are the magnets? :)
>>
>> When you turn the display around, wouldn't the second sensor then
>> come to rest near the same magnet? So you only need one magnet for  
>> both?
>
> Doh - I'll bet thats it.  So the sensor doesn't really indicate  
> orientation,
> but rather that the screen is turned around.  :(  Still useful, but  
> not
> for what we wanted.

yeah, you would need this

	http://dev.laptop.org/ticket/472

- Bert -