STRUCT HTC_EGPIO_CHIP(9)

💅 struct htc_egpio_chip(9) — from the Kernel API Manual, bestie

okay so picture this: it's struct htc_egpio_chip, and it's literally just a lil descriptor babe whose whole job is to help create a gpio_chip for a register range. that's the name section, we ate that ✨

🌸 SYNOPSIS 🌸

here's the whole vibe, character for character, no notes:

struct htc_egpio_chip {
    int reg_start;
    int gpio_base;
    int num_gpios;
    unsigned long direction;
    unsigned long initial_values;
 };

(note the closing brace indented by one space — that's canon, that's the original, leave her alone 🎀)

🦋 Members 🦋

so like, one by one, here's who's who in this struct:

• reg_start — the index of the first register. like the front door of the register range 🚪
• gpio_base — the gpio number of the first pin in this register range. the origin story of your pins ✨
• num_gpios — how many gpios live in this register range, max BITS_PER_LONG — and lowkey the important math: number of registers = DIV_ROUND_UP(num_gpios, reg_width). do NOT forget the formula, it's giving main character energy 🔥
• direction — a bitfield, where '0' = input and '1' = output, 💫

side note bestie: initial_values is right there in the struct too — the Members list in this page just doesn't say anything more about it, so i'm not gonna make stuff up 🙈

✨ SEE ALSO ✨

• Kernel file ./include/linux/platform_data/gpio-htc-egpio.h
• struct htc_egpio_platform_data(9) — go read that one next, iykyk 🫶

and that's the whole page, no cap 💖 huge shoutout to the source ./include/linux/platform_data and the date stamp October 2026 — this page is brought to you by the kernel, the letter struct, and the number BITS_PER_LONG. mwah 💋 periodt 🎀