input_mt_init_slots(9)

💅 NAME 💅

input_mt_init_slots(9) — okay bestie, this is the Kernel API Manual page for input_mt_init_slots, and it does exactly what it says: initialize MT input slots. ✨

✨ SYNOPSIS ✨

int input_mt_init_slots (struct input_dev *dev , unsigned int num_slots
       , unsigned int flags );

🎀 ARGUMENTS 🎀

• dev — the input device supporting MT events and finger tracking. Literally the main character here. 🫶
• num_slots — number of slots used by the device. Yes, the actual count, no vibes-only guessing. 🔢
• flags — mt tasks to handle in core. The little switches that tell the core what to do. ✨

💖 DESCRIPTION 💖

So this function allocates all necessary memory for MT slot handling in the input device, prepares the ABS_MT_SLOT and ABS_MT_TRACKING_ID events for use, and sets up appropriate buffers. It's giving “getting everything ready backstage before the main event.” 🎀

Depending on the flags set, it also performs pointer emulation and frame synchronization. Slay. 💅

It may be called repeatedly — no cap. But heads up: it returns -EINVAL if you're attempting to reinitialize with a different number of slots. So don't try to switch up the slot count mid-routine, bestie. 😭

🦋 SEE ALSO 🦋

Start with the kernel file ./drivers/input/input-mt.c, then go read:

• input_mt_destroy_slots(9)
• input_mt_report_slot_state(9)
• input_mt_report_finger_count(9)
• input_mt_report_pointer_emulation(9)
• input_mt_drop_unused(9)
• input_mt_release_slots(9)
• input_mt_sync_frame(9)
• input_mt_assign_slots(9)
• input_mt_get_slot_by_key(9)

okay that's the whole page, ily — source/version: ./drivers/input · dated: October 2026 🫶💖