cdns_i2c_master_xfer(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cdns_i2c_master_xfer(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: it's giving kernel API manual energy, and today's main character is cdns_i2c_master_xfer. yes we're in the I2C cinematic universe. no cap.

✨ NAME ✨

cdns_i2c_master_xfer — literally the main i2c transfer function. the whole vibe. the moment. 🌟

🦋 SYNOPSIS 🦋

int cdns_i2c_master_xfer (struct i2c_adapter *adap , struct i2c_msg
*msgs , int num );

like… three args, one int coming back at you. that's the whole incantation, slay. 🔥

🌸 ARGUMENTS 🌸

  • adap — a pointer to the i2c adapter driver instance. that's the driver baddie itself, okurrr 🫶
  • msgs — a pointer to the i2c message structure. all the message lore lives here 💌
  • num — the number of messages to transfer. gotta tell it how many, bestie, it's not a mind reader 😭

💜 DESCRIPTION 💜

Initiates the send/recv activity based on the transfer message received. that's it, that's the tea — you hand it the message, it kicks off the send/recv situation. no ✨extra✨ behaviour, don't go making stuff up now. 🧚

🎀 RETURN 🎀

It hits you back with the number of msgs processed on success — and a negative error otherwise. so if the number's negative, that's your villain-origin moment, go check it. 💀

🌈 SEE ALSO 🌈

the whole friend group, honestly. here's the squad:

Kernel file ./drivers/i2c/busses/i2c-cadence.c and all its little siblings:

periodt. read them all, iykyk 👑

fr fr this is the master xfer — if you wanted the atomic one, that's cdns_i2c_master_xfer_atomic(9) right up there. don't mix them up, bestie 🙈

and that's a wrap on cdns_i2c_master_xfer(9) from the Kernel API Manual 💖 shipped out of ./drivers/i2c/busses, dated October 2026 — catch you in the next transfer, mwah 🍓✨

📦 where this page comes from