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| 09:39.41 | 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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| 13:57.34 | aV_V | whats the difference between having access gpios from kernelspace and userspace? |
| 14:10.26 | C-Keen | a couple of system calls |
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| 14:37.45 | aV_V | C-Keen: but I mean, the functionality is the same? |
| 14:38.00 | C-Keen | sure |
| 14:38.19 | C-Keen | all that the kernel driver does is exposing the registers as a sysfs entry |
| 14:38.59 | aV_V | but I can't use the gpio.h on userspace, isn't it? |
| 14:39.57 | C-Keen | aV_V: you usually don't you use the gpio files in /sys/bus/gpio |
| 14:41.06 | aV_V | if I want to make an user program that controls gpios then can I use the linux API (gpio.h)? |
| 14:41.48 | C-Keen | no you use the userspace driver which exposes gpios as files |
| 14:43.00 | aV_V | sorry, I'm totally ignorant on this topic. So there is an userspace driver? Thtat what is I'm looking for? |
| 14:43.14 | aV_V | *?- |
| 14:44.53 | C-Keen | aV_V: look into /sys/bus/gpio |
| 14:49.19 | C-Keen | aV_V: http://elinux.org/GPIO |
| 14:51.40 | aV_V | C-Keen: yes, I'm aware gpio access through descriptors, actually I'm looking for direct-register access |
| 14:53.14 | aV_V | I've found some examples that maps /dev/mem |
| 14:54.17 | aV_V | but it's an workaround, I thought there was an official API for this |
| 14:56.53 | C-Keen | aV_V: no, that's the whole purpose of the kernel, to hide the raw memory access from userland |
| 14:57.21 | C-Keen | the file access is the official api... |
| 14:57.38 | aV_V | ok, thx |
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| 22:56.32 | lkcl | C-Keen: thanks for answering aV_V. |
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