m24lr_write_pass(9)

okay so bestie, welcome to the m24lr_write_pass(9) page in the Kernel API Manual — we're literally in kernel API land and it's giving secure password write energy 💖

💅 NAME 💅

m24lr_write_pass — Write password to M24LR043-R using secure format. No cap, that's the whole name vibe ✨

🎀 SYNOPSIS 🎀

ssize_t m24lr_write_pass (struct m24lr *m24lr , const char *buf , size_t
       count , u8 code );

🫶 ARGUMENTS 🫶

• m24lr — Pointer to device control structure. Your main-character device struct, basically 🫶
• buf — Input buffer containing hex-encoded password. The password lives here, hex-encoded and ready ✨
• count — Number of bytes in buf. Gotta know how many bytes we're working with, periodt 💅
• code — Operation code to embed between password copies. It's the little sandwich filling between the two password copies 🥪

🌸 DESCRIPTION 🌸

Okay so here's the tea: this function parses a 4-byte password, encodes it in big-endian format, and constructs a 9-byte sequence of the form:

[BE(password), code, BE(password)]

The result is written to register 0x0900 (2304), which is the password register in M24LR04E-R chip. Literally iconic 💖

⭐ RETURN ⭐

Number of bytes written on success, or negative error code on failure. If it slays, you get bytes; if not, negative error code, bestie 😭

🦋 SEE ALSO 🦋

• Kernel file ./drivers/nvmem/m24lr.c
  • struct m24lr_chip(9)
  • struct m24lr(9)
  • m24lr_regmap_read(9)
  • m24lr_regmap_write(9)
  • m24lr_write(9)

okay bestie, that's the whole page 💅 — source/version vibe: ./drivers/nvmem, date: October 2026, and the footer title is m24lr_write_pass(9). Catch u later, mwah 🫶