cg3_setcolreg(9)

Bestie, welcome to the cg3_setcolreg(9) page from the Kernel API Manual ✨ This one is an Optional function whose whole job is setting a color register. Let’s get into it 💅

💖 NAME

cg3_setcolreg — Optional function. Sets a color register.

✨ SYNOPSIS

int cg3_setcolreg (unsigned regno , unsigned red , unsigned green ,
       unsigned blue , unsigned transp , struct fb_info *info );

🎀 ARGUMENTS

Okay so here’s the cast, and yes, regno’s description is doing the absolute most:

• regno — boolean, fr: 0 copy local, 1 get_user function
• red — frame buffer colormap structure
• green — The green value which can be up to 16 bits wide
• blue — The blue value which can be up to 16 bits wide.
• transp — If supported the alpha value which can be up to 16 bits wide.
• info — frame buffer info structure

🦋 DESCRIPTION

Okay so the tea ☕: the cg3 palette is loaded with 4 color values at each time, so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on. It’s giving palette Tetris, honestly. We keep a sw copy of the hw cmap to assist us in this esoteric loading procedure — iconic behavior, I know 💜

🌈 SEE ALSO

• Kernel file ./drivers/video/fbdev/cg3.c
• cg3_blank(9)

XOXO, your cg3_setcolreg(9) bestie 💜 — source/version: ./drivers/video/fbdev, dated October 2026 🎀