Hi! > I'm looking at original Maemo N900 2.6.28 sound driver and GPIOs which > controls A/V jack detection. > > For reference source code of that driver can be found e.g. at alsa-devel > ML [1] [2] or in my linux-n900 git tree, branch v2.6.28-nokia [3]. > > In that sound/soc/omap/rx51.c code is function rx51_set_eci_switches() > which configures 2 gpios: RX51_ECI_SWITCH_1_GPIO = gpio 178 and > RX51_ECI_SWITCH_2_GPIO = gpio 182 based on "eci mode" input parameter. > > But in mainline kernel code [4] [5] there is no information about gpio 178 > (as RX51_ECI_SWITCH_1_GPIO) and gpio 182 is called as just "eci-switch". > More interesting part is that "eci-switch" gpio is not used in whole > mainline code. It is just referenced in Nokia N900 DTS [4]. Looks like > sound driver in mainline kernel is incomplete. > > Jarkko, you are listed as original author of that driver. Do you (or > anybody else) remember what that rx51_set_eci_switches() function is > doing? And what gpio 178 controls? I was even not able to find gpio 178 > in RX-51 Schematics [6]. > > And do you know something about Nokia ECI headsets supports for Nokia > N900. Looks like there is already some kernel code but support for ECI > bus or multibuttons headset is missing. What does "ECI" mean? I'd like to get detection of headset button presses to work in recent kernels, but could not figure it out :-(. Are there multi-button headsets compatible with N900? Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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