![Henrik Rydberg](/assets/img/avatar_default.png)
Some semi-mt drivers use the slots in a manual way, but may still want to call parts of the frame synchronization logic. This patch makes input_mt_drop_unused callable from those drivers. Signed-off-by: Henrik Rydberg <rydberg@euromail.se> Reviewed-by: Benson Leung <bleung@chromium.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
449 lines
11 KiB
C
449 lines
11 KiB
C
/*
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* Input Multitouch Library
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*
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* Copyright (c) 2008-2010 Henrik Rydberg
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/input/mt.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#define TRKID_SGN ((TRKID_MAX + 1) >> 1)
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static void copy_abs(struct input_dev *dev, unsigned int dst, unsigned int src)
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{
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if (dev->absinfo && test_bit(src, dev->absbit)) {
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dev->absinfo[dst] = dev->absinfo[src];
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dev->absinfo[dst].fuzz = 0;
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dev->absbit[BIT_WORD(dst)] |= BIT_MASK(dst);
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}
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}
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/**
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* input_mt_init_slots() - initialize MT input slots
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* @dev: input device supporting MT events and finger tracking
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* @num_slots: number of slots used by the device
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* @flags: mt tasks to handle in core
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*
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* This function allocates all necessary memory for MT slot handling
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* in the input device, prepares the ABS_MT_SLOT and
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* ABS_MT_TRACKING_ID events for use and sets up appropriate buffers.
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* Depending on the flags set, it also performs pointer emulation and
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* frame synchronization.
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*
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* May be called repeatedly. Returns -EINVAL if attempting to
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* reinitialize with a different number of slots.
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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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{
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struct input_mt *mt = dev->mt;
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int i;
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if (!num_slots)
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return 0;
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if (mt)
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return mt->num_slots != num_slots ? -EINVAL : 0;
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mt = kzalloc(sizeof(*mt) + num_slots * sizeof(*mt->slots), GFP_KERNEL);
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if (!mt)
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goto err_mem;
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mt->num_slots = num_slots;
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mt->flags = flags;
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input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
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input_set_abs_params(dev, ABS_MT_TRACKING_ID, 0, TRKID_MAX, 0, 0);
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if (flags & (INPUT_MT_POINTER | INPUT_MT_DIRECT)) {
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__set_bit(EV_KEY, dev->evbit);
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__set_bit(BTN_TOUCH, dev->keybit);
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copy_abs(dev, ABS_X, ABS_MT_POSITION_X);
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copy_abs(dev, ABS_Y, ABS_MT_POSITION_Y);
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copy_abs(dev, ABS_PRESSURE, ABS_MT_PRESSURE);
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}
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if (flags & INPUT_MT_POINTER) {
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__set_bit(BTN_TOOL_FINGER, dev->keybit);
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__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
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if (num_slots >= 3)
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__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
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if (num_slots >= 4)
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__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
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if (num_slots >= 5)
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__set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
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__set_bit(INPUT_PROP_POINTER, dev->propbit);
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}
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if (flags & INPUT_MT_DIRECT)
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__set_bit(INPUT_PROP_DIRECT, dev->propbit);
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if (flags & INPUT_MT_SEMI_MT)
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__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
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if (flags & INPUT_MT_TRACK) {
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unsigned int n2 = num_slots * num_slots;
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mt->red = kcalloc(n2, sizeof(*mt->red), GFP_KERNEL);
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if (!mt->red)
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goto err_mem;
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}
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/* Mark slots as 'unused' */
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for (i = 0; i < num_slots; i++)
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input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);
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dev->mt = mt;
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return 0;
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err_mem:
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kfree(mt);
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return -ENOMEM;
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}
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EXPORT_SYMBOL(input_mt_init_slots);
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/**
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* input_mt_destroy_slots() - frees the MT slots of the input device
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* @dev: input device with allocated MT slots
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*
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* This function is only needed in error path as the input core will
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* automatically free the MT slots when the device is destroyed.
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*/
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void input_mt_destroy_slots(struct input_dev *dev)
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{
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if (dev->mt) {
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kfree(dev->mt->red);
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kfree(dev->mt);
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}
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dev->mt = NULL;
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}
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EXPORT_SYMBOL(input_mt_destroy_slots);
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/**
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* input_mt_report_slot_state() - report contact state
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* @dev: input device with allocated MT slots
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* @tool_type: the tool type to use in this slot
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* @active: true if contact is active, false otherwise
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*
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* Reports a contact via ABS_MT_TRACKING_ID, and optionally
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* ABS_MT_TOOL_TYPE. If active is true and the slot is currently
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* inactive, or if the tool type is changed, a new tracking id is
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* assigned to the slot. The tool type is only reported if the
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* corresponding absbit field is set.
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*/
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void input_mt_report_slot_state(struct input_dev *dev,
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unsigned int tool_type, bool active)
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{
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struct input_mt *mt = dev->mt;
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struct input_mt_slot *slot;
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int id;
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if (!mt)
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return;
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slot = &mt->slots[mt->slot];
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slot->frame = mt->frame;
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if (!active) {
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input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
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return;
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}
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id = input_mt_get_value(slot, ABS_MT_TRACKING_ID);
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if (id < 0 || input_mt_get_value(slot, ABS_MT_TOOL_TYPE) != tool_type)
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id = input_mt_new_trkid(mt);
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input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, id);
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input_event(dev, EV_ABS, ABS_MT_TOOL_TYPE, tool_type);
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}
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EXPORT_SYMBOL(input_mt_report_slot_state);
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/**
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* input_mt_report_finger_count() - report contact count
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* @dev: input device with allocated MT slots
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* @count: the number of contacts
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*
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* Reports the contact count via BTN_TOOL_FINGER, BTN_TOOL_DOUBLETAP,
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* BTN_TOOL_TRIPLETAP and BTN_TOOL_QUADTAP.
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*
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* The input core ensures only the KEY events already setup for
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* this device will produce output.
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*/
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void input_mt_report_finger_count(struct input_dev *dev, int count)
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{
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input_event(dev, EV_KEY, BTN_TOOL_FINGER, count == 1);
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input_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, count == 2);
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input_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, count == 3);
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input_event(dev, EV_KEY, BTN_TOOL_QUADTAP, count == 4);
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input_event(dev, EV_KEY, BTN_TOOL_QUINTTAP, count == 5);
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}
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EXPORT_SYMBOL(input_mt_report_finger_count);
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/**
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* input_mt_report_pointer_emulation() - common pointer emulation
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* @dev: input device with allocated MT slots
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* @use_count: report number of active contacts as finger count
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*
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* Performs legacy pointer emulation via BTN_TOUCH, ABS_X, ABS_Y and
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* ABS_PRESSURE. Touchpad finger count is emulated if use_count is true.
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*
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* The input core ensures only the KEY and ABS axes already setup for
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* this device will produce output.
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*/
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void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
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{
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struct input_mt *mt = dev->mt;
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struct input_mt_slot *oldest;
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int oldid, count, i;
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if (!mt)
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return;
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oldest = NULL;
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oldid = mt->trkid;
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count = 0;
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for (i = 0; i < mt->num_slots; ++i) {
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struct input_mt_slot *ps = &mt->slots[i];
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int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
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if (id < 0)
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continue;
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if ((id - oldid) & TRKID_SGN) {
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oldest = ps;
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oldid = id;
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}
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count++;
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}
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input_event(dev, EV_KEY, BTN_TOUCH, count > 0);
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if (use_count)
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input_mt_report_finger_count(dev, count);
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if (oldest) {
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int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);
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int y = input_mt_get_value(oldest, ABS_MT_POSITION_Y);
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input_event(dev, EV_ABS, ABS_X, x);
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input_event(dev, EV_ABS, ABS_Y, y);
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if (test_bit(ABS_MT_PRESSURE, dev->absbit)) {
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int p = input_mt_get_value(oldest, ABS_MT_PRESSURE);
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input_event(dev, EV_ABS, ABS_PRESSURE, p);
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}
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} else {
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if (test_bit(ABS_MT_PRESSURE, dev->absbit))
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input_event(dev, EV_ABS, ABS_PRESSURE, 0);
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}
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}
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EXPORT_SYMBOL(input_mt_report_pointer_emulation);
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/**
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* input_mt_drop_unused() - Inactivate slots not seen in this frame
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* @dev: input device with allocated MT slots
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*
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* Lift all slots not seen since the last call to this function.
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*/
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void input_mt_drop_unused(struct input_dev *dev)
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{
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struct input_mt *mt = dev->mt;
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int i;
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if (!mt)
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return;
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for (i = 0; i < mt->num_slots; i++) {
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if (!input_mt_is_used(mt, &mt->slots[i])) {
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input_mt_slot(dev, i);
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input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
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}
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}
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mt->frame++;
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}
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EXPORT_SYMBOL(input_mt_drop_unused);
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/**
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* input_mt_sync_frame() - synchronize mt frame
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* @dev: input device with allocated MT slots
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*
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* Close the frame and prepare the internal state for a new one.
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* Depending on the flags, marks unused slots as inactive and performs
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* pointer emulation.
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*/
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void input_mt_sync_frame(struct input_dev *dev)
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{
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struct input_mt *mt = dev->mt;
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bool use_count = false;
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if (!mt)
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return;
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if (mt->flags & INPUT_MT_DROP_UNUSED)
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input_mt_drop_unused(dev);
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if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))
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use_count = true;
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input_mt_report_pointer_emulation(dev, use_count);
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}
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EXPORT_SYMBOL(input_mt_sync_frame);
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static int adjust_dual(int *begin, int step, int *end, int eq)
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{
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int f, *p, s, c;
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if (begin == end)
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return 0;
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f = *begin;
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p = begin + step;
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s = p == end ? f + 1 : *p;
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for (; p != end; p += step)
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if (*p < f)
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s = f, f = *p;
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else if (*p < s)
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s = *p;
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c = (f + s + 1) / 2;
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if (c == 0 || (c > 0 && !eq))
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return 0;
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if (s < 0)
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c *= 2;
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for (p = begin; p != end; p += step)
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*p -= c;
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return (c < s && s <= 0) || (f >= 0 && f < c);
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}
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static void find_reduced_matrix(int *w, int nr, int nc, int nrc)
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{
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int i, k, sum;
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for (k = 0; k < nrc; k++) {
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for (i = 0; i < nr; i++)
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adjust_dual(w + i, nr, w + i + nrc, nr <= nc);
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sum = 0;
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for (i = 0; i < nrc; i += nr)
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sum += adjust_dual(w + i, 1, w + i + nr, nc <= nr);
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if (!sum)
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break;
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}
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}
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static int input_mt_set_matrix(struct input_mt *mt,
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const struct input_mt_pos *pos, int num_pos)
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{
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const struct input_mt_pos *p;
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struct input_mt_slot *s;
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int *w = mt->red;
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int x, y;
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for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
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if (!input_mt_is_active(s))
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continue;
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x = input_mt_get_value(s, ABS_MT_POSITION_X);
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y = input_mt_get_value(s, ABS_MT_POSITION_Y);
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for (p = pos; p != pos + num_pos; p++) {
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int dx = x - p->x, dy = y - p->y;
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*w++ = dx * dx + dy * dy;
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}
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}
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return w - mt->red;
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}
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static void input_mt_set_slots(struct input_mt *mt,
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int *slots, int num_pos)
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{
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struct input_mt_slot *s;
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int *w = mt->red, *p;
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for (p = slots; p != slots + num_pos; p++)
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*p = -1;
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for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
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if (!input_mt_is_active(s))
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continue;
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for (p = slots; p != slots + num_pos; p++)
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if (*w++ < 0)
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*p = s - mt->slots;
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}
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for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
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if (input_mt_is_active(s))
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continue;
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for (p = slots; p != slots + num_pos; p++)
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if (*p < 0) {
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*p = s - mt->slots;
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break;
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}
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}
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}
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/**
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* input_mt_assign_slots() - perform a best-match assignment
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* @dev: input device with allocated MT slots
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* @slots: the slot assignment to be filled
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* @pos: the position array to match
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* @num_pos: number of positions
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*
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* Performs a best match against the current contacts and returns
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* the slot assignment list. New contacts are assigned to unused
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* slots.
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*
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* Returns zero on success, or negative error in case of failure.
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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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{
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struct input_mt *mt = dev->mt;
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int nrc;
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if (!mt || !mt->red)
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return -ENXIO;
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if (num_pos > mt->num_slots)
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return -EINVAL;
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if (num_pos < 1)
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return 0;
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nrc = input_mt_set_matrix(mt, pos, num_pos);
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find_reduced_matrix(mt->red, num_pos, nrc / num_pos, nrc);
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input_mt_set_slots(mt, slots, num_pos);
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return 0;
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}
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EXPORT_SYMBOL(input_mt_assign_slots);
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/**
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* input_mt_get_slot_by_key() - return slot matching key
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* @dev: input device with allocated MT slots
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* @key: the key of the sought slot
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*
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* Returns the slot of the given key, if it exists, otherwise
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* set the key on the first unused slot and return.
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*
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* If no available slot can be found, -1 is returned.
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*/
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int input_mt_get_slot_by_key(struct input_dev *dev, int key)
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{
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struct input_mt *mt = dev->mt;
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struct input_mt_slot *s;
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if (!mt)
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return -1;
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for (s = mt->slots; s != mt->slots + mt->num_slots; s++)
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if (input_mt_is_active(s) && s->key == key)
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return s - mt->slots;
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for (s = mt->slots; s != mt->slots + mt->num_slots; s++)
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if (!input_mt_is_active(s)) {
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s->key = key;
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return s - mt->slots;
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}
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return -1;
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}
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EXPORT_SYMBOL(input_mt_get_slot_by_key);
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