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misc: ws2812-pio-rp1: Allow gamma to be disabled #7110

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Merged
pelwell merged 1 commit into from
Oct 27, 2025
Merged

misc: ws2812-pio-rp1: Allow gamma to be disabled #7110

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6 changes: 4 additions & 2 deletions arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -5980,8 +5980,10 @@ Params: brightness Set the initial brightness for the LEDs. The
a single byte to offset 0 of the device. Note
that brightness is a multiplier for the pixel
values, and only white pixels can reach the
maximum visible brightness. (range 0-255,
default 255)
maximum visible brightness. N.B. Setting
brightness to 0 acctivates pass-through mode,
disabling all brightness and gamma processing.
(range 0-255, default 255)
dev_name The name for the /dev/ device entry. Note that
if the name includes '%d' it will be replaced
by the instance number. (default 'leds%d')
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4 changes: 2 additions & 2 deletions drivers/misc/ws2812-pio-rp1.c
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Expand Up @@ -142,8 +142,8 @@ static uint8_t ws2812_apply_gamma(uint8_t brightness, uint8_t val)
{
int bright;

if (!val)
return 0;
if (!val || !brightness)
return val;
bright = (val * brightness) / 255;
return ws2812_gamma[bright];
}
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