ir_establish_scancode(9)

💅 ir_establish_scancode — a.k.a. the "put a keycode in the table bestie" era

okay so first things first, this is page ir_establish_scancode(9) from the Kernel API Manual, and honestly? she's a little baddie that just wants to put a scancode in a table. iconic behaviour, no notes. 🎀

✨ NAME ✨

ir_establish_scancode — set a keycode in the scancode->keycode table 🦋

Like, that's it. That's her whole job. She sets a keycode in the scancode->keycode table and she does it slayfully.

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✨ SYNOPSIS ✨

unsigned int ir_establish_scancode (struct rc_dev *dev , struct rc_map
*rc_map , u64 scancode , bool resize );

look at her go 🫶 four args, one return value, zero drama.

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✨ ARGUMENTS ✨

• dev — the struct rc_dev device descriptor. it's giving "who am I doing this for", and the answer is this device right here 💖
• rc_map — the scancode table to be searched. this is the little hangout spot where all the scancodes live 🌸
• scancode — the desired scancode. the one we're manifesting ✨
• resize — controls whether we're allowed to resize the table to accommodate not-yet-present scancodes. so like… are we allowed to knock down a wall and add a extra bedroom for a scancode that doesn't have a spot yet? this bool decides 🧚

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✨ DESCRIPTION ✨

okay so the tea ☕: this routine is used to locate a given scancode in rc_map. she goes looking, she snoops around the table, very main character energy.

and if the scancode is not yet present? no worries bestie, the routine will allocate a new slot for it. she literally builds a whole new seat at the table. that's growth. that's construction. that's lowkey iconic 👑

ngl this is why resize matters — whether she's allowed to expand the table is entirely up to that bool, so don't be surprised if the vibe check fails on a table that can't grow 💀

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✨ RETURN ✨

she returns the index of the mapping containing the scancode in question — cute, precise, useful 💅

or -1U in case of failure 😭 which is the kernel way of saying "she did not slay today".

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✨ SEE ALSO ✨

the whole friend group, fr fr — plus the kernel file they all hang out in: ./drivers/media/rc/rc-main.c 📁

• scancode_to_u64(9)
• ir_create_table(9)
• ir_free_table(9)
• ir_resize_table(9)
• ir_update_mapping(9)
• ir_setkeycode(9)
• ir_setkeytable(9)
• ir_lookup_by_scancode(9)
• ir_getkeycode(9)
• rc_g_keycode_from_table(9)
• ir_do_keyup(9)
• rc_keyup(9)
• ir_timer_keyup(9)
• ir_timer_repeat(9)
• rc_repeat(9)
• ir_do_keydown(9)
• rc_keydown(9)
• rc_keydown_notimeout(9)
• rc_validate_scancode(9)
• rc_validate_filter(9)
• struct rc_filter_attribute(9)
• show_protocols(9)
• parse_protocol_change(9)
• store_protocols(9)
• show_filter(9)
• store_filter(9)
• show_wakeup_protocols(9)
• store_wakeup_protocols(9)

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and that's the page!! 🎀 source is ./drivers/media/rc, dated October 2026 — so she's fresh, she's current, she's got that new-manpage smell 🌈 byeee, go set some keycodes responsibly 💜