ishtp_cl_es...h_connection(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ishtp_cl_establish_connection(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual ✨ you're literally about to read ishtp_cl_es...h_connection(9) (yes the header abbreviates it like that, don't come for me) and honestly? it's giving "small helper function, big main character energy" 🔥

💖 NAME

ishtp_cl_establish_connection — establishing a connection with the firmware, but make it a whole personality 🫶

✨ SYNOPSIS

int ishtp_cl_establish_connection (struct ishtp_cl *cl , const guid_t
*uuid , int tx_size , int rx_size , bool reset );

that's the whole vibe, one function call, five arguments, no cap 💅

🎀 ARGUMENTS

  • cl — your client device instance, the star of the show 👑
  • uuid — the uuid of the client we're out here searching for 🔍
  • tx_size — TX ring buffer size, aka how much room the transmit side gets 📤
  • rx_size — RX ring buffer size, same deal but for receiving 📥
  • reset — true if you're calling this to reset the connection, otherwise it's for the first connection, iykyk 🌸

🦋 DESCRIPTION

so this is a helper function for the client driver to build a connection with the firmware 🫶 it's literally doing the intro work so your driver doesn't have to.

if it's the first time connecting to the firmware, set reset to false — then this function will link the client to the bus, find the client id, and send a connect request to the firmware. iconic behavior honestly ✨

if it's called for a reset handler, like where the client lost connection after a firmware reset, set reset to true — then this function will reinit the client state and establish the connection again 🔁 and here's the cute part: in this case, this function reuses the current client structure and ring buffers, specifically to avoid allocation failure and memory fragments 🧚 she's efficient, she's considerate, she recycles 💜

🔥 RETURN

  • 0 → successful connection with the firmware, slay 🎉
  • an error code → on failure 😭 (that's it, that's the whole return contract, periodt)

🌈 SEE ALSO

the kernel file lives right here:

./drivers/hid/intel-ish-hid/ishtp/client.c

and here's the whole friend group, all referenced, no one left out 🫶

💀 real talk though: if you're resetting, pass reset as true and let her reuse the buffers — don't be out here fighting allocation failures for no reason bestie 🙈

⭐ okay that's the page!! sourced straight from ./drivers/hid/intel-ish-hid/ishtp, dated October 2026, and signed off by your favorite manual, ishtp_cl_es...h_connection(9) 🎀 bye bestie, go establish some connections 💖

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