ish_send(9)

✨ ish_send(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 — today's main character is ish_send, and honestly? it's giving messenger arc.

🌸 NAME 🌸

ish_send — send a message from host to firmware 🫶

🦋 SYNOPSIS 🦋

int ish_send (struct ishtp_cl_data *client_data , u8 *out_msg , size_t
out_size , u8 *in_msg , size_t in_size );

like, yes, that's the whole vibe. five params, one int, iconic. 🔥

🎀 ARGUMENTS 🎀

• client_data — the client data instance ✨ your little handle on the whole situation
• out_msg — the message buffer that's getting shipped off to firmware 📤
• out_size — how big that outgoing message is, size-wise
• in_msg — the message buffer where the incoming data gets copied 💌 (this buffer is allocated by calling — and yeah, the manpage literally just trails off there, no cap, that's how it's written 😭)
• in_size — the max size of the incoming message, so, like, the ceiling 🚧

👑 RETURN 👑

On success you get the number of bytes copied into in_msg 💖 — and on failure it's a negative error code, periodt. 💀

🌈 SEE ALSO 🌈

lowkey the whole friend group shows up here — kernel file ./drivers/platform/chrome/cros_ec_ishtp.c, plus:

• struct response_info(9)
• struct ishtp_cl_data(9)
• ish_evt_handler(9)
• process_recv(9)
• ish_event_cb(9)
• cros_ish_init(9)
• cros_ish_deinit(9)
• prepare_cros_ec_rx(9)
• cros_ec_ishtp_probe(9)
• cros_ec_ishtp_remove(9)
• cros_ec_ishtp_reset(9)
• cros_ec_ishtp_suspend(9)
• cros_ec_ishtp_resume(9)

ngl bestie, everything here lives under ./drivers/platform/chrome, and this page is dated October 2026 🗓️ — so when you see ish_send(9) in the wild, that's the era it's from. go forth and send those messages, mwah 💋🧚