i2c_find_adapter_by_fwnode(9)

💖 NAME 💖

okay so bestie, welcome to i2c_find_adapter_by_fwnode(9) from the Kernel API Manual — it’s the function that’s literally like “where is my i2c adapter?” but for a fwnode. It’s giving lookup energy, no cap. 🦋

✨ SYNOPSIS ✨

struct i2c_adapter * i2c_find_adapter_by_fwnode (struct fwnode_handle
*fwnode );

🌸 ARGUMENTS 🌸

• fwnode — the struct fwnode_handle corresponding to the struct i2c_adapter. That’s the little handle, bestie. 💅

🎀 DESCRIPTION 🎀

okay so here’s the whole vibe: it looks up and returns the struct i2c_adapter corresponding to the fwnode. If no adapter can be found, or if fwnode is NULL, this returns NULL. Periodt. 💀

⚠️ cleanup check, bestie: the user must call put_device(adapter->dev) once done with the i2c adapter. Do not skip that — it’s literally required. 🙈

🔥 SEE ALSO 🔥

Kernel file ./drivers/i2c/i2c-core-base.c — and the whole iconic friend group is:

• i2c_verify_client(9)
• i2c_adapter_lock_bus(9)
• i2c_adapter_trylock_bus(9)
• i2c_adapter_unlock_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_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)

💖 xoxo, bestie — source/version: ./drivers/i2c, date: October 2026, page: i2c_find_adapter_by_fwnode(9). slay and goodbye. 🫶