read_i2c_reg(9)

🌸 NAME 🌸

okay bestie, this is read_i2c_reg(9) from the Kernel API Manual, and it reads an internal i2c register. that's the whole assignment. 💅

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✨ SYNOPSIS ✨

int read_i2c_reg (void __iomem *addr , u8 index , u8 *data );

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🎀 ARGUMENTS 🎀

• addr — dt3155 mmio base address. that's the home base, periodt.
• index — index (internal address) of register to read. yep, the internal address of the register you're reading. iykyk.
• data — pointer to byte the read data will be placed in. it's literally giving "put the read byte right here" energy. 🫶

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🔥 RETURN 🔥

zero on success or error code. so 0 is the success slay, and an error code is the other possibility. no cap. 💀

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🦋 DESCRIPTION 🦋

This function starts reading the specified (by index) register and busy waits for the process to finish. the way that it just waits there, busy-style, until the read is done? iconic. ✨

The result is placed in a byte pointed by data. so the read result lands in the byte that data points to, fr fr. 🎀

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🌈 SEE ALSO 🌈

Kernel file ./drivers/media/pci/dt3155/dt3155.c, plus write_i2c_reg(9), write_i2c_reg_nowait(9), and wait_i2c_reg(9). go off, bestie. 🫶

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signed off from ./drivers/media/pci/dt3155, dated October 2026 — mwah, bye 💋💖