i2c_adapter_unlock_bus(9)

🌸 i2c_adapter_unlock_bus(9) 🌸

okay bestie, so this is a page from the Kernel API Manual, section 9, and it's literally all about letting go of an I2C bus segment — releasing that exclusive access you grabbed earlier. think of it as the un-clutching, the "okay you can have it back now 💅". no gatekeeping here, we share.

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✨ NAME ✨

i2c_adapter_unlock_bus — release exclusive access to an I2C bus segment 🫶

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🦋 SYNOPSIS 🦋

void i2c_adapter_unlock_bus (struct i2c_adapter *adapter , unsigned int
flags );

yep that's it, that's the whole vibe — returns nothing (void), takes an adapter and some flags. lowkey iconic for how unbothered it is.

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🎀 ARGUMENTS 🎀

• adapter — the target I2C bus segment. this is the bus you're handing back, the main character of the whole operation 👑
• flags — okay so this is the important one, pay attention bestie: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, like the whole entire thing at the top of the tree. and I2C_LOCK_SEGMENT unlocks only this branch in the adapter tree — just your little corner, not the whole family tree 🌳 so pick your fighter wisely, the scope is literally different.

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/i2c/i2c-core-base.c
• i2c_verify_client(9)
• i2c_adapter_lock_bus(9) — the one that takes the lock, the lock's other half fr fr
• i2c_adapter_trylock_bus(9)
• i2c_new_client_device(9)
• i2c_unregister_device(9)
• i2c_find_device_by_fwnode(9)
• i2c_new_dummy_device(9)
• devm_i2c_new_dummy_device(9)
• i2c_new_ancillary_device(9)
• i2c_verify_adapter(9)
• i2c_handle_smbus_host_notify(9)
• i2c_add_adapter(9)
• i2c_add_numbered_adapter(9)
• i2c_del_adapter(9)
• devm_i2c_add_adapter(9)
• i2c_find_adapter_by_fwnode(9)
• i2c_get_adapter_by_fwnode(9)
• i2c_parse_fw_timings(9)
• i2c_del_driver(9)
• __i2c_transfer(9)
• i2c_transfer(9)
• i2c_transfer_buffer_flags(9)
• i2c_get_device_id(9)
• i2c_client_get_device_id(9)
• i2c_get_dma_safe_msg_buf(9)
• i2c_put_dma_safe_msg_buf(9)

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💖 friendly reminder from your girl: if you locked it, you unlock it. no leaving the bus held hostage, that's not the energy we're bringing to the kernel.

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okay that's the page!! 🎀 this one lives in ./drivers/i2c and it's dated October 2026 — yes, future-dated, she's ahead of her time 💅✨ go off, i2c_adapter_unlock_bus(9), periodt 🦋