tpm2_probe(9)

🦋 tpm2_probe(9) — the kernel API manual, bestie edition 🦋

okay so this is tpm2_probe, a page from the Kernel API Manual, and honestly? it's a little icon and it deserves your attention 💅

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✨ NAME ✨

tpm2_probe — probe for the TPM 2.0 protocol 🕵️‍♀️

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🌸 SYNOPSIS 🌸

int tpm2_probe (struct tpm_chip *chip );

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🎀 ARGUMENTS 🎀

• chip — a tpm_chip instance. that's it, that's the whole argument 🫶

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💖 DESCRIPTION 💖

so what this does is: it sends an idempotent TPM 2.0 command, and then it just looks at the response tag to see whether there's a TPM2 chip on the other end 👀 like a vibe check but for hardware.

and if there is one? this function sets the flag TPM_CHIP_FLAG_TPM2. no cap, that's the whole assignment 🏁

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🔥 RETURN 🔥

• 0 on success 🎉
• -errno otherwise 😭

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🌈 SEE ALSO 🌈

kernel file ./drivers/char/tpm/tpm2-cmd.c, and also, like, the whole friend group:

• tpm2_calc_ordinal_duration(9)
• tpm2_pcr_read(9)
• tpm2_pcr_extend(9)
• tpm2_get_random(9)
• tpm2_flush_context(9)
• tpm2_get_tpm_pt(9)
• tpm2_shutdown(9)
• tpm2_do_selftest(9)
• tpm2_startup(9)
• tpm2_auto_startup(9)

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and that's the page, bestie 🍓 mwah 💋 this one lives in ./drivers/char/tpm, dated October 2026, and it's filed under tpm2_probe(9) — go forth and probe responsibly ✨🧚💜