lkcl changed the topic of #arm-netbook to: arm-netbook: Don't ask to ask. Just ask! - EOMA68 spec http://bit.ly/ZHqfxA - ML arm-netbook@lists.phcomp.co.uk - Logs http://bit.ly/XELKJq or http://bit.ly/15OCYPD - For Allwinner/sunxi discussions prefer #linux-sunxi - iMX6 Card http://bit.ly/XAUGCD - Flying Squirrel http://bit.ly/WgOYaR - Allwinner A10/A20 Card http://bit.ly/zBLAbY - http://rhombus-tech.net
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<SPG> Luke Leighton master 962128e source rock_chips/rk3288.mdwn add forward port of vpu patches * http://source.rhombus-tech.net/?p=source.git;a=commitdiff;h=962128e
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<aV_V> whats the difference between having access gpios from kernelspace and userspace?
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<C-Keen> a couple of system calls
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<aV_V> C-Keen: but I mean, the functionality is the same?
<C-Keen> sure
<C-Keen> all that the kernel driver does is exposing the registers as a sysfs entry
<aV_V> but I can't use the gpio.h on userspace, isn't it?
<C-Keen> aV_V: you usually don't you use the gpio files in /sys/bus/gpio
<aV_V> if I want to make an user program that controls gpios then can I use the linux API (gpio.h)?
<C-Keen> no you use the userspace driver which exposes gpios as files
<aV_V> sorry, I'm totally ignorant on this topic. So there is an userspace driver? Thtat what is I'm looking for?
<aV_V> *?-
<C-Keen> aV_V: look into /sys/bus/gpio
<C-Keen> aV_V: http://elinux.org/GPIO
<aV_V> C-Keen: yes, I'm aware gpio access through descriptors, actually I'm looking for direct-register access
<aV_V> I've found some examples that maps /dev/mem
<aV_V> but it's an workaround, I thought there was an official API for this
<C-Keen> aV_V: no, that's the whole purpose of the kernel, to hide the raw memory access from userland
<C-Keen> the file access is the official api...
<aV_V> ok, thx
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<lkcl> C-Keen: thanks for answering aV_V.
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