246 lines
6.9 KiB
C
246 lines
6.9 KiB
C
/*
|
|
* Input Multitouch Library
|
|
*
|
|
* Copyright (c) 2008-2010 Henrik Rydberg
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/input/mt.h>
|
|
#include <linux/export.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define TRKID_SGN ((TRKID_MAX + 1) >> 1)
|
|
|
|
static void copy_abs(struct input_dev *dev, unsigned int dst, unsigned int src)
|
|
{
|
|
if (dev->absinfo && test_bit(src, dev->absbit)) {
|
|
dev->absinfo[dst] = dev->absinfo[src];
|
|
dev->absbit[BIT_WORD(dst)] |= BIT_MASK(dst);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* input_mt_init_slots() - initialize MT input slots
|
|
* @dev: input device supporting MT events and finger tracking
|
|
* @num_slots: number of slots used by the device
|
|
*
|
|
* 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.
|
|
* May be called repeatedly. Returns -EINVAL if attempting to
|
|
* reinitialize with a different number of slots.
|
|
*/
|
|
int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,
|
|
unsigned int flags)
|
|
{
|
|
struct input_mt *mt = dev->mt;
|
|
int i;
|
|
|
|
if (!num_slots)
|
|
return 0;
|
|
if (mt)
|
|
return mt->num_slots != num_slots ? -EINVAL : 0;
|
|
|
|
mt = kzalloc(sizeof(*mt) + num_slots * sizeof(*mt->slots), GFP_KERNEL);
|
|
if (!mt)
|
|
return -ENOMEM;
|
|
|
|
mt->num_slots = num_slots;
|
|
mt->flags = flags;
|
|
input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
|
|
input_set_abs_params(dev, ABS_MT_TRACKING_ID, 0, TRKID_MAX, 0, 0);
|
|
|
|
if (flags & (INPUT_MT_POINTER | INPUT_MT_DIRECT)) {
|
|
__set_bit(EV_KEY, dev->evbit);
|
|
__set_bit(BTN_TOUCH, dev->keybit);
|
|
|
|
copy_abs(dev, ABS_X, ABS_MT_POSITION_X);
|
|
copy_abs(dev, ABS_Y, ABS_MT_POSITION_Y);
|
|
copy_abs(dev, ABS_PRESSURE, ABS_MT_PRESSURE);
|
|
}
|
|
if (flags & INPUT_MT_POINTER) {
|
|
__set_bit(BTN_TOOL_FINGER, dev->keybit);
|
|
__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
|
|
if (num_slots >= 3)
|
|
__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
|
|
if (num_slots >= 4)
|
|
__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
|
|
if (num_slots >= 5)
|
|
__set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
|
|
__set_bit(INPUT_PROP_POINTER, dev->propbit);
|
|
}
|
|
if (flags & INPUT_MT_DIRECT)
|
|
__set_bit(INPUT_PROP_DIRECT, dev->propbit);
|
|
|
|
/* Mark slots as 'unused' */
|
|
for (i = 0; i < num_slots; i++)
|
|
input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);
|
|
|
|
dev->mt = mt;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(input_mt_init_slots);
|
|
|
|
/**
|
|
* input_mt_destroy_slots() - frees the MT slots of the input device
|
|
* @dev: input device with allocated MT slots
|
|
*
|
|
* This function is only needed in error path as the input core will
|
|
* automatically free the MT slots when the device is destroyed.
|
|
*/
|
|
void input_mt_destroy_slots(struct input_dev *dev)
|
|
{
|
|
kfree(dev->mt);
|
|
dev->mt = NULL;
|
|
}
|
|
EXPORT_SYMBOL(input_mt_destroy_slots);
|
|
|
|
/**
|
|
* input_mt_report_slot_state() - report contact state
|
|
* @dev: input device with allocated MT slots
|
|
* @tool_type: the tool type to use in this slot
|
|
* @active: true if contact is active, false otherwise
|
|
*
|
|
* Reports a contact via ABS_MT_TRACKING_ID, and optionally
|
|
* ABS_MT_TOOL_TYPE. If active is true and the slot is currently
|
|
* inactive, or if the tool type is changed, a new tracking id is
|
|
* assigned to the slot. The tool type is only reported if the
|
|
* corresponding absbit field is set.
|
|
*/
|
|
void input_mt_report_slot_state(struct input_dev *dev,
|
|
unsigned int tool_type, bool active)
|
|
{
|
|
struct input_mt *mt = dev->mt;
|
|
struct input_mt_slot *slot;
|
|
int id;
|
|
|
|
if (!mt)
|
|
return;
|
|
|
|
slot = &mt->slots[mt->slot];
|
|
slot->frame = mt->frame;
|
|
|
|
if (!active) {
|
|
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
|
|
return;
|
|
}
|
|
|
|
id = input_mt_get_value(slot, ABS_MT_TRACKING_ID);
|
|
if (id < 0 || input_mt_get_value(slot, ABS_MT_TOOL_TYPE) != tool_type)
|
|
id = input_mt_new_trkid(mt);
|
|
|
|
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, id);
|
|
input_event(dev, EV_ABS, ABS_MT_TOOL_TYPE, tool_type);
|
|
}
|
|
EXPORT_SYMBOL(input_mt_report_slot_state);
|
|
|
|
/**
|
|
* input_mt_report_finger_count() - report contact count
|
|
* @dev: input device with allocated MT slots
|
|
* @count: the number of contacts
|
|
*
|
|
* Reports the contact count via BTN_TOOL_FINGER, BTN_TOOL_DOUBLETAP,
|
|
* BTN_TOOL_TRIPLETAP and BTN_TOOL_QUADTAP.
|
|
*
|
|
* The input core ensures only the KEY events already setup for
|
|
* this device will produce output.
|
|
*/
|
|
void input_mt_report_finger_count(struct input_dev *dev, int count)
|
|
{
|
|
input_event(dev, EV_KEY, BTN_TOOL_FINGER, count == 1);
|
|
input_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, count == 2);
|
|
input_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, count == 3);
|
|
input_event(dev, EV_KEY, BTN_TOOL_QUADTAP, count == 4);
|
|
input_event(dev, EV_KEY, BTN_TOOL_QUINTTAP, count == 5);
|
|
}
|
|
EXPORT_SYMBOL(input_mt_report_finger_count);
|
|
|
|
/**
|
|
* input_mt_report_pointer_emulation() - common pointer emulation
|
|
* @dev: input device with allocated MT slots
|
|
* @use_count: report number of active contacts as finger count
|
|
*
|
|
* Performs legacy pointer emulation via BTN_TOUCH, ABS_X, ABS_Y and
|
|
* ABS_PRESSURE. Touchpad finger count is emulated if use_count is true.
|
|
*
|
|
* The input core ensures only the KEY and ABS axes already setup for
|
|
* this device will produce output.
|
|
*/
|
|
void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
|
|
{
|
|
struct input_mt *mt = dev->mt;
|
|
struct input_mt_slot *oldest;
|
|
int oldid, count, i;
|
|
|
|
if (!mt)
|
|
return;
|
|
|
|
oldest = 0;
|
|
oldid = mt->trkid;
|
|
count = 0;
|
|
|
|
for (i = 0; i < mt->num_slots; ++i) {
|
|
struct input_mt_slot *ps = &mt->slots[i];
|
|
int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
|
|
|
|
if (id < 0)
|
|
continue;
|
|
if ((id - oldid) & TRKID_SGN) {
|
|
oldest = ps;
|
|
oldid = id;
|
|
}
|
|
count++;
|
|
}
|
|
|
|
input_event(dev, EV_KEY, BTN_TOUCH, count > 0);
|
|
if (use_count)
|
|
input_mt_report_finger_count(dev, count);
|
|
|
|
if (oldest) {
|
|
int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);
|
|
int y = input_mt_get_value(oldest, ABS_MT_POSITION_Y);
|
|
int p = input_mt_get_value(oldest, ABS_MT_PRESSURE);
|
|
|
|
input_event(dev, EV_ABS, ABS_X, x);
|
|
input_event(dev, EV_ABS, ABS_Y, y);
|
|
input_event(dev, EV_ABS, ABS_PRESSURE, p);
|
|
} else {
|
|
input_event(dev, EV_ABS, ABS_PRESSURE, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(input_mt_report_pointer_emulation);
|
|
|
|
/**
|
|
* input_mt_sync_frame() - synchronize mt frame
|
|
* @dev: input device with allocated MT slots
|
|
*
|
|
* Close the frame and prepare the internal state for a new one.
|
|
* Depending on the flags, marks unused slots as inactive and performs
|
|
* pointer emulation.
|
|
*/
|
|
void input_mt_sync_frame(struct input_dev *dev)
|
|
{
|
|
struct input_mt *mt = dev->mt;
|
|
struct input_mt_slot *s;
|
|
|
|
if (!mt)
|
|
return;
|
|
|
|
if (mt->flags & INPUT_MT_DROP_UNUSED) {
|
|
for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
|
|
if (s->frame == mt->frame)
|
|
continue;
|
|
input_mt_slot(dev, s - mt->slots);
|
|
input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
|
|
}
|
|
}
|
|
|
|
input_mt_report_pointer_emulation(dev, (mt->flags & INPUT_MT_POINTER));
|
|
|
|
mt->frame++;
|
|
}
|
|
EXPORT_SYMBOL(input_mt_sync_frame);
|