i2c_unlock_bus(9)

💅 i2c_unlock_bus(9)

okay so bestie, welcome to the Kernel API Manual — yes, that's the manual name, and yes, it's giving "I read the kernel source for fun" energy. we're talking about i2c_unlock_bus today and honestly? she's the calm, responsible friend who hands the keys back after the road trip. iconic behaviour. 🫶

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✨ NAME ✨

i2c_unlock_bus — release exclusive access to an I2C bus segment 🎀

like, you grabbed the bus, you did your thing, and now you're politely letting go so everyone else can have a turn. manners! we love to see it. 🌸

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🦋 SYNOPSIS 🦋

void i2c_unlock_bus (struct i2c_adapter *adapter , unsigned int flags );

that's it. that's the whole vibe. returns nothing (it's a void, she doesn't owe you a status code 💅), takes an adapter pointer and some flags, done. ✨

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🌈 ARGUMENTS 🌈

• adapter — the target I2C bus segment 🎯 like, which bus are we unlocking? that one. this pointer right here.
• flags — okay so this is the "how much am I letting go of" dial, and there are exactly two moves:
  • I2C_LOCK_ROOT_ADAPTER — unlocks the root i2c adapter 👑 the big one, the main character energy option
  • I2C_LOCK_SEGMENT — unlocks only this branch in the adapter tree 🌿 just your little corner of the family tree, not the whole thing

pick your fighter wisely, bestie. no cap. 🙈

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🧚 SEE ALSO 🧚

okay this list is long but I refuse to leave anyone out, they're all invited to the group chat 💖

Kernel file ./include/linux/i2c.h — plus these legends:

• i2c_master_recv(9)
• i2c_master_recv_dmasafe(9)
• i2c_master_send(9)
• i2c_master_send_dmasafe(9)
• struct i2c_device_identity(9)
• enum i2c_driver_flags(9)
• struct i2c_driver(9)
• struct i2c_client(9)
• struct i2c_board_info(9)
• I2C_BOARD_INFO(9)
• struct i2c_algorithm(9)
• struct i2c_lock_operations(9)
• struct i2c_timings(9)
• struct i2c_bus_recovery_info(9)
• struct i2c_adapter_quirks(9)
• i2c_lock_bus(9)
• i2c_trylock_bus(9)
• i2c_mark_adapter_suspended(9)
• i2c_mark_adapter_resumed(9)
• i2c_check_quirks(9)
• module_i2c_driver(9)
• builtin_i2c_driver(9)

go read all of them. or at least the lock/unlock trio. iykyk. 🔥

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alright that's the whole page, you ate that 🍓 — mwah 💋

sourced from ./include/linux, dated October 2026 — so you know it's fresh off the tree 🎀✨

unlock responsibly, bestie 👑💜