show_protocols(9)

💖 show_protocols(9) — like, the Kernel API Manual page, bestie 💖

okay so this is a page from the Kernel API Manual (yes, the show_protocols(9) one, that's the name of the whole vibe), and honestly? it's a little baddie. let's get into it ✨

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🌸 NAME 🌸

show_protocols — shows the current IR protocol(s) 💅

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🎀 SYNOPSIS 🎀

ssize_t show_protocols (struct device *device , struct device_attribute
*mattr , char *buf );

like, that's the whole signature. eat it up. 🍓

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🦋 ARGUMENTS 🦋

• device — the device descriptor 🫶
• mattr — the device attribute struct
• buf — a pointer to the output buffer, ok so this is where the good stuff goes

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✨ DESCRIPTION ✨

so this routine? it's a callback routine for input read — it does the IR protocol type(s) thing. it gets triggered when someone reads /sys/class/rc/rc?/protocols 📖 and it returns the protocol names of the supported protocols. and here's the cute part: the enabled protocols are printed in brackets 🔥 iykyk.

also dev->lock gets taken, and that's on purpose — it's guarding against races between store_protocols and show_protocols. literally just keeping things from getting messy, no cap. 🔒

bestie be aware: that lock is doing real work, don't be out here thinking it's decorative 💀

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🌈 SEE ALSO 🌈

• kernel file ./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_establish_scancode(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)
• parse_protocol_change(9)
• store_protocols(9)
• show_filter(9)
• store_filter(9)
• show_wakeup_protocols(9)
• store_wakeup_protocols(9)

like, that's the whole friend group right there. main character energy from every single one. 👑

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and that's the page!! 🧚 source is ./drivers/media/rc, and the date on this lil baddie is October 2026 — screenshot it, remember it, periodt. 💜👑