[maemo-developers] [maemo-developers] Re: brightness Re: [maemo-users] Re: Storage/Sleep Issues..

[From: Frantisek Dufka]

Karoliina.T.Salminen at nokia.com wrote:
> Hi,
> 
>>>> Nothinig prevents you from creating a sysfs entry wich returns
>>>>
>>>> tahvo_get_backlight_level()
>>>>
>>>> or even a proc one, if you really are into that sort of thing.
>>> There is such entry - 
>>> /sys/devices/platform/omapfb/panel/backlight_level
> 
> One related thing would interest me:
> - would it be possible to crank the level up further than the 127 the 
> number in /sys/devices/platform/omapfb/panel/backlight_level states when
> the
> display plugin has the maximum setting?

Not on kernel level and probably also not also directly on tahvo 
register access level.

kernel-source-2.6.16/drivers/cbus/tahvo.c:

static int tahvo_7bit_backlight;

int tahvo_get_backlight_level(void)
{
         int mask;

         if (tahvo_7bit_backlight)
                 mask = 0x7f;
         else
                 mask = 0x0f;
         return tahvo_read_reg(TAHVO_REG_LEDPWMR) & mask;
}

int tahvo_get_max_backlight_level(void)
{
         if (tahvo_7bit_backlight)
                 return 0x7f;
         else
                 return 0x0f;
}


void tahvo_set_backlight_level(int level)
{
         int max_level;

         max_level = tahvo_get_max_backlight_level();
         if (level > max_level)
                 level = max_level;
         tahvo_write_reg(TAHVO_REG_LEDPWMR, level);
}