__crb_cmd_ready(9)

🌈 __crb_cmd_ready(9) 🌈

okay bestie, welcome to the Kernel API Manual corner of the group chat — this one is all about __crb_cmd_ready, and it's lowkey iconic for asking a tpm crb device to get itself into the ready state 💅✨

💖 NAME 💖

__crb_cmd_ready — request tpm crb device to enter ready state 🫶

✨ SYNOPSIS ✨

int __crb_cmd_ready (struct device *dev , struct crb_priv *priv , int
       loc );

🎀 ARGUMENTS 🎀

• dev — the crb device 📱
• priv — the crb private data 🔒
• loc — the locality 📍

🧚 DESCRIPTION 🧚

So the function literally writes CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ and then polls till the device acknowledges it by clearing the bit 👀 The device should respond within TIMEOUT_C — that's the deadline, bestie ⏳

It does nothing for devices with the ACPI-start method or the SMC-start method — like, not a single thing 🙈

🦋 RETURN 🦋

• 0 on success 🎉
• -ETIME on timeout 😭

👑 SEE ALSO 👑

• Kernel file ./drivers/char/tpm/tpm_crb.c 📁
• __crb_go_idle(9) 🌟

final cute sign-off: source/version ./drivers/char/tpm, date October 2026, for the one and only __crb_cmd_ready(9) 💖✨