store_filter(9)

✨ store_filter(9) ✨

okay so welcome to the Kernel API Manual, bestie: this is store_filter(9), and she is literally the little write-side glow-up for your scancode filter. no cap 🎀

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🌸 NAME 🌸

store_filter — changes the scancode filter value. periodt.

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🌈 SYNOPSIS 🌈

ssize_t store_filter (struct device *device , struct device_attribute
       *attr , const char *buf , size_t len );

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🧚 ARGUMENTS 🧚

• device — the device descriptor. yes, the whole device vibe 💖
• attr — the device attribute struct.
• buf — a pointer to the input buffer.
• len — length of the input buffer.

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💅 DESCRIPTION 💅

This routine is for changing a scancode filter value or mask. it gets triggered by writing to /sys/class/rc/rc?/[wakeup_]filter[_mask] — that path is the whole entrance, iykyk ✨

Returns -EINVAL if an invalid filter value for the current protocol was specified, or if scancode filtering is not supported by the driver. otherwise it returns len. slay 🙈

Bits of the filter value corresponding to set bits in the filter mask are compared against input scancodes, and non-matching scancodes are discarded. so the mask is like “these bits? they matter,” and any scancode that doesn’t match gets the discard treatment 🔥

dev->lock is taken to guard against races between store_filter and show_filter. no racing, no chaos, we lock it down 💀

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🦋 SEE ALSO 🦋

Kernel file ./drivers/media/rc/rc-main.c, and the whole friend group is:

• 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)
• show_protocols(9)
• parse_protocol_change(9)
• store_protocols(9)
• show_filter(9)
• show_wakeup_protocols(9)
• store_wakeup_protocols(9)

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source/date + page vibe: ./drivers/media/rc, October 2026, store_filter(9) — bye bestie, go write that filter 💖