New leds driver...

[regr...@shutko.ru]

I've made a driver to work with my cubieboard leds (/dev/class/leds). I'm too lazy to commit it to git so I put it here.

To compile it you need linux-sunxi kernel source with configured and compiled kernel. Here is instruction:

1. Create directory and put sun4i_leds.c there

2. Create Makefile with single line "obj-m := sun4i-leds.o"

3. Run 

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -C /path/to/linux-sunxi/  SUBDIRS=$PWD modules

and you'll get sun4i-leds.ko module

4. Recompile kernel with CONFIG_NEW_LEDS=y (also there is a number of triggers available to enable)

5. Get your script.bin from /dev/mmcblk0p1 (mount it) and decompile it into script.fex

6. Add to script.fex following lines:

[leds]

leds_used = 1

leds_num = 2

leds_pin_1  = port:PH20<1><default><default><0>

leds_name_1 = "ph20:green:led1"

leds_pin_2  = port:PH21<1><default><default><0>

leds_name_2 = "ph21:blue:led2"

7. Compile script.fex into script.bin

8. Put new kernel and script.bin to /dev/mmcblk0p1 partition

9. Reboot & insmod sun4i-leds.ko

Now you can use 

echo 255 > /sys/class/leds/ph20:green:led1/brightness

 to light led or you can play with triggers to blink it on usb/mmc activity. 

Sata/ide trigger currently doesn't work (i'll try to fix this)

Here is info about linux led class http://www.kernel.org/doc/Documentation/leds/leds-class.txt

[Alejandro Mery]

would you mind submitting it to the linux-sunxi ML?

thanks!
Alejandro Mery

[regr...@shutko.ru]

 Sent a patch, but didn't received cc. Did you received it ?

[Alejandro Mery]

El 10/01/2013 01:58, <regr...@shutko.ru> escribió:
>
>  Sent a patch, but didn't received cc. Did you received it ?
>

yes. received ;-)

Thank you!

[Dmitriy B.]

It got into spamfolder (damn google groups spam detection triggering on each big patch), I've moved it from there and added your email in whitelist.

Best Regards,

Dmitriy Beykun

2013/1/10 <regr...@shutko.ru>

[theRat]

What is the most efficient way to use this driver from within a userspace c program?