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// SPDX-License-Identifier: GPL-2.0
/*
* Sysfs APIs for Google Pixel devices.
*
* Copyright 2022 Google LLC.
*/
#include "touch_mf_mode.h"
/* Update a state machine used to toggle control of the touch IC's motion
* filter.
*/
int touch_mf_update_state(struct touch_mf *tmf, u8 touches)
{
/* Motion filter timeout, in milliseconds */
const u32 mf_timeout_ms = 500;
u8 next_state = TOUCH_MF_STATE_UNFILTERED;
mutex_lock(&tmf->update_mutex);
tmf->touches = touches;
if (tmf->mode == TOUCH_MF_MODE_UNFILTERED) {
next_state = TOUCH_MF_STATE_UNFILTERED;
} else if (tmf->mode == TOUCH_MF_MODE_DYNAMIC) {
/* Determine the next filter state. The motion filter is enabled
* by default and it is disabled while a single finger is
* touching the screen. If another finger is touched down or if
* a timeout expires, the motion filter is reenabled and remains
* enabled until all fingers are lifted.
*/
next_state = tmf->state;
switch (tmf->state) {
case TOUCH_MF_STATE_FILTERED:
if (touches == 1) {
next_state = TOUCH_MF_STATE_UNFILTERED;
tmf->downtime = ktime_get();
}
break;
case TOUCH_MF_STATE_UNFILTERED:
if (touches == 0) {
next_state = TOUCH_MF_STATE_FILTERED;
} else if (touches > 1 ||
ktime_after(ktime_get(),
ktime_add_ms(tmf->downtime,
mf_timeout_ms))) {
next_state = TOUCH_MF_STATE_LOCKED;
}
break;
case TOUCH_MF_STATE_LOCKED:
if (touches == 0) {
next_state = TOUCH_MF_STATE_FILTERED;
}
break;
}
} else if (tmf->mode == TOUCH_MF_MODE_FILTERED) {
next_state = TOUCH_MF_STATE_FILTERED;
} else if (tmf->mode == TOUCH_MF_MODE_AUTO_REPORT) {
next_state = TOUCH_MF_STATE_UNFILTERED;
}
/* Update continuously report switch if needed */
if ((next_state == TOUCH_MF_STATE_UNFILTERED) !=
(tmf->state == TOUCH_MF_STATE_UNFILTERED)) {
if (tmf->set_continuously_report_enabled != NULL) {
tmf->set_continuously_report_enabled(&tmf->pdev->dev,
next_state == TOUCH_MF_STATE_UNFILTERED);
}
}
tmf->state = next_state;
mutex_unlock(&tmf->update_mutex);
return 0;
}
int touch_mf_set_mode(struct touch_mf *tmf, enum touch_mf_mode mode)
{
int ret = 0;
if ((mode < TOUCH_MF_MODE_UNFILTERED) ||
(mode > TOUCH_MF_MODE_AUTO_REPORT)) {
ret = -EINVAL;
} else {
tmf->mode = mode;
touch_mf_update_state(tmf, tmf->touches);
}
return ret;
}
int touch_mf_init(struct touch_mf *tmf)
{
/* init motion filter mode */
tmf->mode = TOUCH_MF_MODE_DYNAMIC;
tmf->touches = 0;
mutex_init(&tmf->update_mutex);
return 0;
}
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