request_ish_firmware(9)

📦 version 7.3.1, in nixpkgs unstable

💖 request_ish_firmware(9) — the manual page, but make it make sense 💖

okay so this is a page from the Kernel API Manual, and the star of the show is request_ish_firmware(9). if you've ever wondered how your kernel goes shopping for ISH firmware, bestie, this is literally the whole tea. 🫖✨

🌸 NAME 🌸

request_ish_firmware — request and load the ISH firmware. that's it, that's the vibe. 👑

✨ SYNOPSIS ✨

int request_ish_firmware (const struct firmware **firmware_p , struct device *dev );

like, two args, one int coming back at you. clean. iconic. no notes. 💅

🎀 ARGUMENTS 🎀

  • firmware_p — pointer to the firmware image. yes, it's a double pointer, don't panic, it's giving "I'll fill this in for you" energy. 🦋
  • dev — the device that's out here requesting firmware. it's the main character of this whole operation.

🔥 DESCRIPTION 🔥

so here's what this function does: it tries to load the Integrated Sensor Hub (ISH) firmware for the device you handed it. and it does NOT just grab the first thing it sees — it goes down a whole priority list, starting with the most ✨custom, most precisely-matched✨ firmware first. bespoke firmware, if you will. tailored. couture. 🎀

here's the order, and ngl it's a whole journey:

ish_${fw_generation}_${SYS_VENDOR_CRC32}_$(PRODUCT_FAMILY_CRC32)_$(PRODUCT_NAME_CRC32)_${PRODUCT_SKU_CRC32}.bin

ish_${fw_generation}_${SYS_VENDOR_CRC32}_$(PRODUCT_FAMILY_CRC32)_${PRODUCT_SKU_CRC32}.bin
ish_${fw_generation}_${SYS_VENDOR_CRC32}_$(PRODUCT_FAMILY_CRC32)_$(PRODUCT_NAME_CRC32).bin
ish_${fw_generation}_${SYS_VENDOR_CRC32}_$(PRODUCT_FAMILY_CRC32).bin
ish_${fw_generation}_${SYS_VENDOR_CRC32}_$(PRODUCT_NAME_CRC32)_${PRODUCT_SKU_CRC32}.bin
ish_${fw_generation}_${SYS_VENDOR_CRC32}_${PRODUCT_SKU_CRC32}.bin
ish_${fw_generation}_${SYS_VENDOR_CRC32}_$(PRODUCT_NAME_CRC32).bin
ish_${fw_generation}_${SYS_VENDOR_CRC32}.bin ish_${fw_generation}.bin

how it actually goes down 👇

  • the driver loads the first matching firmware it finds, and skips the rest. first come, first served, no second-guessing. 💅
  • if nothing matches, it moves on to the next pattern in the order above. keep it moving, queen.
  • and if every single search fails? the default Intel firmware swoops in — it's listed last in the order above, and it's the fallback. thank u, Intel. 🙏

why the CRC32 thing tho? 🤔 the firmware file name is constructed using CRC32 checksums of strings. and the reason is genuinely so smart: those original strings might have spaces or special characters in them, and you can't be out here putting that in a file name. so checksums turn them into a valid file name. slay. 🦋

and for the CRC nerds (iykyk), the CRC-32 algorithm uses these parameters:

  • Poly: 0x04C11DB7
  • Init: 0xFFFFFFFF
  • RefIn: true
  • RefOut: true
  • XorOut: 0xFFFFFFFF

💀 RETURN 💀

  • 0 on success — we love a clean win. 🌈
  • negative error code on failure — not the vibe, but it's honest. 😭

🌸 SEE ALSO 🌸

the kernel file lives at ./drivers/hid/intel-ish-hid/ishtp/loader.c — go look, it's giving lore 👀

also check out these besties:

💖 that's the whole page!! 💖 this lil manual page comes to you from ./drivers/hid/intel-ish-hid/ishtp, dated October 2026, and it's filed under request_ish_firmware(9) — go forth and load firmware responsibly, bestie 🫶✨

📦 where this page comes from