cros_ec_keyb_register_bs(9)

💅 cros_ec_keyb_register_bs(9) — the Kernel API Manual page, but make it make sense

okay so bestie, this is cros_ec_keyb_register_bs(9) from the Kernel API Manual, and honestly? it's a little baddie of a function. it does one job and it does it cute. let's get into it ✨

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🌸 NAME 🌸

cros_ec_keyb_register_bs — the function that registers your non-matrix buttons and switches 🎀

like, the keys that aren't in the regular key grid. those ones. she handles those.

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🦋 SYNOPSIS 🦋

int cros_ec_keyb_register_bs (struct cros_ec_keyb *ckdev , bool
       expect_buttons_switches );

that's the whole signature, no cap 💅

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🎀 ARGUMENTS 🎀

• ckdev — the keyboard device, aka the main character here 👑 this is your struct cros_ec_keyb * and everything revolves around her.
• expect_buttons_switches — a bool that says "yes bestie, the EC must report button and/or switch events." it's literally the flag that tells everyone to be ready for those events 🙈

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✨ DESCRIPTION ✨

so what does she actually do? she handles all the bits of the keyboard driver related to non-matrix buttons and switches — including asking the EC about which ones are present 👀 and telling the kernel to expect them. it's giving project manager energy fr fr.

and here's the important bit, listen up 🫶 if this device has no support for buttons and switches, we don't throw a fit — we return no error 🎉 but heads up: ckdev->bs_idev will remain NULL when this function exits. so like, no error, but also no bs_idev. she's just not there. don't go dereferencing her, i'm begging 😭

returns 0 if no error, or -error upon error. classic. iconic. periodt. 💀

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/input/keyboard/cros_ec_keyb.c
• struct cros_ec_keyb(9)
• struct cros_ec_bs_map(9)
• cros_ec_keyb_report_bs(9)
• cros_ec_keyb_info(9)
• cros_ec_keyb_query_switches(9)
• cros_ec_keyb_resume(9)
• cros_ec_keyb_register_matrix(9)

go read the whole friend group, they're all linked up 💜

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ngl this one's short but she's important — buttons and switches don't register themselves, bestie 🍓

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and that's the tea 🧚 this page lives in ./drivers/input/keyboard, dated October 2026, brought to you by the Kernel API Manual. mwah 💖 stay hydrated and don't forget your NULL checks 🌈⭐