m24lr_regmap_read(9)

✨ m24lr_regmap_read ✨

okay so bestie, welcome to the Kernel API Manual — this one's m24lr_regmap_read(9) and it's literally the "read it and if it doesn't work, read it again" icon we all needed 💅

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🌸 NAME 🌸

m24lr_regmap_read — read data using regmap with retry on failure 🎀

So like, it reads stuff, through regmap, and if the read fails it just… tries again. Lowkey stubborn. Highkey reliable. ✨

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🦋 SYNOPSIS 🦋

ssize_t m24lr_regmap_read (struct regmap *regmap , u8 *buf , size_t size
, unsigned int offset );

That's the whole vibe check right there 👑

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💖 ARGUMENTS 💖

• regmap — the regmap instance for the device, aka the main character's home base 🏠
• buf — buffer to store the read data, this is where the tea gets poured 🍵
• size — number of bytes to read, how much tea we're pouring, fr fr
• offset — starting register address, where we start pouring from 📍

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🧚 DESCRIPTION 🧚

Okay so here's the plot: this function attempts to read a block of data from the device with retries and timeout. That's it, that's the whole thing 😭

But why, you ask? Because some M24LR chips may transiently NACK reads — like, for example, during internal write cycles 🙈 — so this function retries with a short sleep until the timeout expires. It's giving "I'll wait for you to be ready, no cap" 🫶

💀 heads up bestie: those NACKs are transient, meaning the chip is just busy doing its own internal write cycles, not broken. The retry-with-short-sleep-until-timeout is the whole strategy. Don't come for it. ✨

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⭐ RETURN ⭐

• Number of bytes read on success — slay, it worked 💖
• -ETIMEDOUT if the read fails within the timeout window — it tried, it really did, but the clock ran out 😭⏰

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/nvmem/m24lr.c
• struct m24lr_chip(9)
• struct m24lr(9)
• m24lr_regmap_write(9)
• m24lr_write(9)
• m24lr_write_pass(9)

go read those too, iykyk 👑🔥

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🎀 and that's the page!! brought to you from ./drivers/nvmem, October 2026, in the one and only Kernel API Manual — stay hydrated, keep your retries short, and don't let a transient NACK ruin your whole day 🌸💜🦋