i2c_irq_handler(9)

💅 i2c_irq_handler(9) 💅

okay so real talk, bestie — this little page lives in the Kernel API Manual, and it's about one single function that does a lot of heavy lifting. let's get into it ✨

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🌸 NAME 🌸

i2c_irq_handler — the interrupt routine. that's it, that's the vibe. it's the function that wakes up when the hardware yells "hey!! something happened!!" 🫶

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⭐ SYNOPSIS ⭐

irqreturn_t i2c_irq_handler (int irq , void *arg );

literally the whole signature. no cap, that's it. two args, one return. iconic. 👑

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🎀 ARGUMENTS 🎀

• irq — the interrupt number. like, which interrupt is knocking at the door 🚪
• arg — the data that got passed to the handler. it's the little bundle of context that comes with the knock 🎁

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🦋 DESCRIPTION 🦋

so this is the interrupt handler for the i2c driver, and the way that it handles things? obsessed. 💖

currently it deals with the major interrupts, specifically:

• the Rx & Tx FIFO management interrupts 📥📤
• the master transaction interrupts 🤝
• the arbitration and bus error interrupts 💀 (yes, those exist, and yes, they're handled)

and the rest of the interrupts? they're treated as unhandled. not ignored maliciously, just… not claimed. they get the "seen, not responded to" treatment 🙈

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🌈 SEE ALSO 🌈

bestie, the cross-reference list is long and honestly kind of a serve. all of these live in the kernel file ./drivers/i2c/busses/i2c-nomadik.c:

• struct i2c_vendor_data(9)
• struct i2c_nmk_client(9)
• struct nmk_i2c_dev(9)
• flush_i2c_fifo(9)
• disable_all_interrupts(9)
• clear_all_interrupts(9)
• init_hw(9)
• load_i2c_mcr_reg(9)
• setup_i2c_controller(9)
• read_i2c(9)
• write_i2c(9)
• nmk_i2c_xfer_one(9)
• nmk_i2c_xfer(9)
• disable_interrupts(9)

iykyk 🧚

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quick reminder: the unmatched interrupts stay unhandled by design — that's not a bug, that's just the assignment 💅

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and that's the page!! mwah 💋 sign-off time: this one ships from ./drivers/i2c/busses, dated October 2026, and it goes out to all the interrupt-handling girlies. slay, periodt, bye 🎀🔥