STRUCT LINEDISP(9)

🌸 struct linedisp(9) 🌸

okay bestie so you're deep in the Kernel API Manual and you just bumped into struct linedisp — the private data structure for a character line display. she's private, she's structured, she's lowkey the whole personality of your little character display. let's get into it 💅

✨ NAME ✨

struct linedisp — the private data structure that holds everything for a character line display. like, the whole backstage dressing room 🎀

✨ SYNOPSIS ✨

struct linedisp {
    struct device dev;
    struct timer_list timer;
    const struct linedisp_ops *ops;
    struct linedisp_map *map;
    char *buf;
    char *message;
    unsigned int num_chars;
    unsigned int message_len;
    unsigned int scroll_pos;
    unsigned int scroll_rate;
    unsigned int id;
 };

no cap, that's character-for-character what's in the header. do not touch, do not "clean up" the spacing, just vibe with it 🙈

✨ Members ✨

• dev — the line display device herself. the actual device struct, main character energy ⭐
• timer — the timer that makes the scrolling happen. yes, the scroll is timer-driven. she moves on her own schedule 🕐
• ops — the character line display operations. the function table, the whole toolkit, the iykyk 🤝
• buf — pointer to the buffer holding the string that's currently on display. what you see rn 💖
• message — the full message you want to display or scroll across the display. the entire thing, not just the visible slice ✨
• num_chars — how many characters can actually fit on the display. the size of the window, the fit check 🎀
• message_len — the length of the message string. how long message actually is 🦋
• scroll_pos — index of the first character of message that's currently displayed. where in the message we are rn, like a little bookmark 🔖
• scroll_rate — the scroll interval, measured in jiffies. yep, jiffies. that's the unit. that's the vibe 🌈
• id — the instance id of this display. so if you've got multiples, you know which one is which 👑

✨ SEE ALSO ✨

• Kernel file ./drivers/auxdisplay/line-display.h enum — go read it, fr fr
• linedisp_map_type(9)
• struct linedisp_map(9)
• struct linedisp_ops(9)

okay that's the whole page, you ate that 🫶 go forth and scroll your little displays responsibly 💜

mwah 💋 — with love from ./drivers/auxdisplay, dated October 2026 (yes, the future, don't ask) 🌸✨