forked from mirrors/linux
348cbf987e
Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct input_mt. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20230922175036.work.762-kees@kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _INPUT_MT_H
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#define _INPUT_MT_H
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/*
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* Input Multitouch Library
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*
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* Copyright (c) 2010 Henrik Rydberg
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*/
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#include <linux/input.h>
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#define TRKID_MAX 0xffff
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#define INPUT_MT_POINTER 0x0001 /* pointer device, e.g. trackpad */
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#define INPUT_MT_DIRECT 0x0002 /* direct device, e.g. touchscreen */
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#define INPUT_MT_DROP_UNUSED 0x0004 /* drop contacts not seen in frame */
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#define INPUT_MT_TRACK 0x0008 /* use in-kernel tracking */
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#define INPUT_MT_SEMI_MT 0x0010 /* semi-mt device, finger count handled manually */
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/**
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* struct input_mt_slot - represents the state of an input MT slot
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* @abs: holds current values of ABS_MT axes for this slot
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* @frame: last frame at which input_mt_report_slot_state() was called
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* @key: optional driver designation of this slot
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*/
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struct input_mt_slot {
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int abs[ABS_MT_LAST - ABS_MT_FIRST + 1];
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unsigned int frame;
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unsigned int key;
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};
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/**
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* struct input_mt - state of tracked contacts
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* @trkid: stores MT tracking ID for the next contact
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* @num_slots: number of MT slots the device uses
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* @slot: MT slot currently being transmitted
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* @flags: input_mt operation flags
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* @frame: increases every time input_mt_sync_frame() is called
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* @red: reduced cost matrix for in-kernel tracking
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* @slots: array of slots holding current values of tracked contacts
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*/
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struct input_mt {
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int trkid;
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int num_slots;
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int slot;
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unsigned int flags;
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unsigned int frame;
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int *red;
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struct input_mt_slot slots[] __counted_by(num_slots);
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};
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static inline void input_mt_set_value(struct input_mt_slot *slot,
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unsigned code, int value)
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{
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slot->abs[code - ABS_MT_FIRST] = value;
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}
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static inline int input_mt_get_value(const struct input_mt_slot *slot,
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unsigned code)
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{
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return slot->abs[code - ABS_MT_FIRST];
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}
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static inline bool input_mt_is_active(const struct input_mt_slot *slot)
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{
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return input_mt_get_value(slot, ABS_MT_TRACKING_ID) >= 0;
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}
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static inline bool input_mt_is_used(const struct input_mt *mt,
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const struct input_mt_slot *slot)
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{
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return slot->frame == mt->frame;
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}
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int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
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unsigned int flags);
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void input_mt_destroy_slots(struct input_dev *dev);
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static inline int input_mt_new_trkid(struct input_mt *mt)
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{
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return mt->trkid++ & TRKID_MAX;
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}
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static inline void input_mt_slot(struct input_dev *dev, int slot)
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{
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input_event(dev, EV_ABS, ABS_MT_SLOT, slot);
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}
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static inline bool input_is_mt_value(int axis)
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{
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return axis >= ABS_MT_FIRST && axis <= ABS_MT_LAST;
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}
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static inline bool input_is_mt_axis(int axis)
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{
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return axis == ABS_MT_SLOT || input_is_mt_value(axis);
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}
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bool input_mt_report_slot_state(struct input_dev *dev,
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unsigned int tool_type, bool active);
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static inline void input_mt_report_slot_inactive(struct input_dev *dev)
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{
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input_mt_report_slot_state(dev, 0, false);
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}
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void input_mt_report_finger_count(struct input_dev *dev, int count);
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void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
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void input_mt_drop_unused(struct input_dev *dev);
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void input_mt_sync_frame(struct input_dev *dev);
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/**
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* struct input_mt_pos - contact position
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* @x: horizontal coordinate
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* @y: vertical coordinate
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*/
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struct input_mt_pos {
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s16 x, y;
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};
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int input_mt_assign_slots(struct input_dev *dev, int *slots,
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const struct input_mt_pos *pos, int num_pos,
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int dmax);
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int input_mt_get_slot_by_key(struct input_dev *dev, int key);
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#endif
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