[Gta04-owner] Linux 3.2-rc3 on GTA04
christoph.mair at gmail.com
Sun Nov 27 01:19:18 CET 2011
On Sat, Nov 26, 2011 at 12:43 PM, NeilBrown <neilb at suse.de> wrote:
> - Brand new driver for the LEDs (tca6507] 
> - Backlight control with PWM - untested 
> 2/ My new from-scratch driver for leds-tca6507 provides full support for
> setting brightness levels and hardware-assisted blinking, all through the
> standard /sys/class/leds/* interface. The leds are given names:
> (no blue LED - I'm sad :-)
This works fine, also with triggers (for charging and SD access).
> The driver can also make lines appear as GPIO output. The Wifi reset now
> appears as /sys/class/gpio/WiFi-Reset
> (I haven't tested it though).
> 3/ I included the PWM (Pulse Width Modulation) driver that Nikolaus mentions
> in http://projects.goldelico.com/p/gta04-kernel/issues/85/ and figured
> out how to link it up with the backlight function.
> I've checked that 'setterm -blank force' and 'setterm -blank poke' cause
> the PWM module to request different pulse widths, but I don't know if
> it is actually affecting the backlight (because I don't have one plugged
> Test reports would be most welcome.
Changing the brightness using
/sys/class/backlight/pwm-backlight/brightness works great. Values
between 12 and 100 do enable and dim the backlight. With values <= 11
the display stays dark.
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