Messages in this thread | | | Subject | Re: spitz: add gpio button support (AK_INT and remote control description) | From | Stanislav Brabec <> | Date | Wed, 07 Oct 2009 13:29:51 +0200 |
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Pavel Machek wrote: > On Tue 2009-10-06 13:48:52, Stanislav Brabec wrote: > > Pavel Machek wrote: > > > I'm not sure what AK_INT is, nor what event it should > > > generate. > > > > AK_INT: remote control detect > > Thanks. So for now I'll do: > > /* This is for remote control support. Zaurus supports wired > remote on headphones. */ > { > .type = EV_KEY, > .code = KEY_F13, > .gpio = SPITZ_GPIO_AK_INT, > .desc = "Wired remote (AK_INT)", > }, > > ..and leave it for proper driver to support nicely.
I think that AK_INT should not generate key press event. Permanently pressed key could confuse many programs.
But we may want to use switch events. I propose to create new switch event for it: SW_REMOTE_INSERT. But mapping of AK_INT to SW_REMOTE_INSERT cannot be straightforward.
That is why I propose to ignore AK_INT for now.
Following implementation may be used later (with future resistor matrix keyboard driver):
Map SPITZ_GPIO_HP_IN to SW_JACK_PHYSICAL_INSERT (after debouncing).
Generate SW_REMOTE_INSERT if: - SW_JACK_PHYSICAL_INSERT is on AK_INT is active and remote pin has full voltage or - SW_JACK_PHYSICAL_INSERT is on and remote driver shows valid value
SW_REMOTE_INSERT should be recognized by the Jack abstraction layer (sound/core/jack.c).
Well, I am thinking about defining extra values for resistors, that can make stuff even more useful at cost of need of non-standard wiring on fourth ring of the audio jack. It can generate SW_MICROPHONE_INSERT, SW_LINEOUT_INSERT, and not yet defined SW_HEADESET_INSERT and SW_LINEIN_INSERT (which would require hardware mod inside Zaurus for stereo line-in).
The default may be SW_HEADPHONE_INSERT (short connection between remote pin and ground).
-- Best Regards / S pozdravem,
Stanislav Brabec software developer --------------------------------------------------------------------- SUSE LINUX, s. r. o. e-mail: sbrabec@suse.cz Lihovarská 1060/12 tel: +420 284 028 966, +49 911 740538747 190 00 Praha 9 fax: +420 284 028 951 Czech Republic http://www.suse.cz/
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