i2c_lock_bus(9)

💅 i2c_lock_bus(9) — like, the actual Kernel API Manual page 🎀

okay so bestie, welcome to the glow-up of i2c_lock_bus(9) from the Kernel API Manual ✨ this is the whole page, every crumb of it, just with the vibes turned ALL the way up. grab a boba and let's go 🧋

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✨ NAME ✨

i2c_lock_bus — get exclusive access to an I2C bus segment 🔒👑

like literally, you're claiming the bus. nobody else gets a turn until you say so. main character energy fr fr.

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🌸 SYNOPSIS 🌸

void i2c_lock_bus (struct i2c_adapter *adapter , unsigned int flags );

yep that's it. that's the whole signature. void return so nothing comes back at you, and yes there's a space before that comma in the original — she's iconic, we keep her exactly as she is 💅

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🦋 ARGUMENTS 🦋

• adapter — target I2C bus segment 🎯 like, which bus are we locking? this one. the one you're pointing at.
• flags — the vibe selector, two options and they are NOT the same:
  • I2C_LOCK_ROOT_ADAPTER — locks the root i2c adapter 👑 goes all the way up to the top of the tree, no cap.
  • I2C_LOCK_SEGMENT — locks only this branch in the adapter tree 🌿 just your little corner, nothing else. very "this is my section" of it.

so pick your fighter: whole root, or just the segment. choose wisely bestie 🫶

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💖 SEE ALSO 💖

this one comes with a whole friend group, they all live in the kernel file ./include/linux/i2c.h 📂 so go say hi to:

• 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_trylock_bus(9)
• i2c_unlock_bus(9)
• i2c_mark_adapter_suspended(9)
• i2c_mark_adapter_resumed(9)
• i2c_check_quirks(9)
• module_i2c_driver(9)
• builtin_i2c_driver(9)

the whole squad, assembled 🌈 literally a group chat in ./include/linux/i2c.h, iykyk 💀

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and that's the page, bestie!! no notes, she ate 💅✨

sign-off time 🎀 this one's from the ./include/linux source, dated October 2026, and it's filed under i2c_lock_bus(9) — mwah, go lock that bus 👑💜