/*
 * pt_mt_common.c
 * Parade TrueTouch(TM) Standard Product Multi-Touch Reports Module.
 * For use with Parade touchscreen controllers.
 * Supported parts include:
 * TMA5XX
 * TMA448
 * TMA445A
 * TT21XXX
 * TT31XXX
 * TT4XXXX
 * TT7XXX
 * TC3XXX
 *
 * Copyright (C) 2015-2020 Parade Technologies
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2, and only version 2, as published by the
 * Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Contact Parade Technologies at www.paradetech.com <ttdrivers@paradetech.com>
 */

#include "pt_regs.h"

#define MT_PARAM_SIGNAL(md, sig_ost) PARAM_SIGNAL(md->pdata->frmwrk, sig_ost)
#define MT_PARAM_MIN(md, sig_ost) PARAM_MIN(md->pdata->frmwrk, sig_ost)
#define MT_PARAM_MAX(md, sig_ost) PARAM_MAX(md->pdata->frmwrk, sig_ost)
#define MT_PARAM_FUZZ(md, sig_ost) PARAM_FUZZ(md->pdata->frmwrk, sig_ost)
#define MT_PARAM_FLAT(md, sig_ost) PARAM_FLAT(md->pdata->frmwrk, sig_ost)

/*******************************************************************************
 * FUNCTION: pt_mt_lift_all
 *
 * SUMMARY: Reports touch liftoff action
 *
 * PARAMETERS:
 *     *md - pointer to touch data structure
 ******************************************************************************/
static void pt_mt_lift_all(struct pt_mt_data *md)
{
	int max = md->si->tch_abs[PT_TCH_T].max;

	if (md->num_prv_rec != 0) {
		if (md->mt_function.report_slot_liftoff)
			md->mt_function.report_slot_liftoff(md, max);
		input_sync(md->input);
		md->num_prv_rec = 0;
	}
}

/*******************************************************************************
 * FUNCTION: pt_get_touch_axis
 *
 * SUMMARY: Calculates touch axis
 *
 * PARAMETERS:
 *     *md      - pointer to touch data structure
 *     *axis    - pointer to axis calculation result
 *      size    - size in byte
 *      max     - max value of result
 *     *xy_data - pointer to input data to be parsed
 *      bofs    - bit offset
 ******************************************************************************/
static void pt_get_touch_axis(struct pt_mt_data *md,
	int *axis, int size, int max, u8 *xy_data, int bofs)
{
	int nbyte;
	int next;

	for (nbyte = 0, *axis = 0, next = 0; nbyte < size; nbyte++) {
		pt_debug(md->dev, DL_DEBUG,
			"%s: *axis=%02X(%d) size=%d max=%08X xy_data=%p xy_data[%d]=%02X(%d) bofs=%d\n",
			__func__, *axis, *axis, size, max, xy_data, next,
			xy_data[next], xy_data[next], bofs);
		*axis = *axis + ((xy_data[next] >> bofs) << (nbyte * 8));
		next++;
	}

	*axis &= max - 1;

	pt_debug(md->dev, DL_DEBUG,
		"%s: *axis=%02X(%d) size=%d max=%08X xy_data=%p xy_data[%d]=%02X(%d)\n",
		__func__, *axis, *axis, size, max, xy_data, next,
		xy_data[next], xy_data[next]);
}

/*******************************************************************************
 * FUNCTION: pt_get_touch_hdr
 *
 * SUMMARY: Get the header of touch report
 *
 * PARAMETERS:
 *     *md      - pointer to touch data structure
 *     *touch   - pointer to pt_touch structure
 *     *xy_mode - pointer to touch mode data
 ******************************************************************************/
static void pt_get_touch_hdr(struct pt_mt_data *md,
	struct pt_touch *touch, u8 *xy_mode)
{
	struct device *dev = md->dev;
	struct pt_sysinfo *si = md->si;
	enum pt_tch_hdr hdr;

	for (hdr = PT_TCH_TIME; hdr < PT_TCH_NUM_HDR; hdr++) {
		if (!si->tch_hdr[hdr].report)
			continue;
		pt_get_touch_axis(md, &touch->hdr[hdr],
			si->tch_hdr[hdr].size,
			si->tch_hdr[hdr].max,
			xy_mode + si->tch_hdr[hdr].ofs,
			si->tch_hdr[hdr].bofs);
		pt_debug(dev, DL_DEBUG, "%s: get %s=%04X(%d)\n",
			__func__, pt_tch_hdr_string[hdr],
			touch->hdr[hdr], touch->hdr[hdr]);
	}

	pt_debug(dev, DL_INFO,
		"%s: time=%X tch_num=%d lo=%d noise=%d counter=%d\n",
		__func__,
		touch->hdr[PT_TCH_TIME],
		touch->hdr[PT_TCH_NUM],
		touch->hdr[PT_TCH_LO],
		touch->hdr[PT_TCH_NOISE],
		touch->hdr[PT_TCH_COUNTER]);
}

/*******************************************************************************
 * FUNCTION: pt_get_touch_record
 *
 * SUMMARY: Gets axis of touch report
 *
 * PARAMETERS:
 *     *md      - pointer to touch data structure
 *     *touch   - pointer to pt_touch structure
 *     *xy_data - pointer to touch data
 ******************************************************************************/
static void pt_get_touch_record(struct pt_mt_data *md,
	struct pt_touch *touch, u8 *xy_data)
{
	struct device *dev = md->dev;
	struct pt_sysinfo *si = md->si;
	enum pt_tch_abs abs;

	for (abs = PT_TCH_X; abs < PT_TCH_NUM_ABS; abs++) {
		if (!si->tch_abs[abs].report)
			continue;
		pt_get_touch_axis(md, &touch->abs[abs],
			si->tch_abs[abs].size,
			si->tch_abs[abs].max,
			xy_data + si->tch_abs[abs].ofs,
			si->tch_abs[abs].bofs);
		pt_debug(dev, DL_DEBUG, "%s: get %s=%04X(%d)\n",
			__func__, pt_tch_abs_string[abs],
			touch->abs[abs], touch->abs[abs]);
	}
}

/*******************************************************************************
 * FUNCTION: pt_mt_process_touch
 *
 * SUMMARY: Process touch includes oritation,axis invert and
 *  convert MAJOR/MINOR from mm to resolution
 *
 * PARAMETERS:
 *     *md      - pointer to touch data structure
 *     *touch   - pointer to pt_touch structure
 ******************************************************************************/
static void pt_mt_process_touch(struct pt_mt_data *md,
	struct pt_touch *touch)
{
	struct device *dev = md->dev;
	struct pt_sysinfo *si = md->si;
	int tmp;
	bool flipped;


	/* Orientation is signed */
	touch->abs[PT_TCH_OR] = (int8_t)touch->abs[PT_TCH_OR];

	if (md->pdata->flags & PT_MT_FLAG_FLIP) {
		tmp = touch->abs[PT_TCH_X];
		touch->abs[PT_TCH_X] = touch->abs[PT_TCH_Y];
		touch->abs[PT_TCH_Y] = tmp;
		if (touch->abs[PT_TCH_OR] > 0)
			touch->abs[PT_TCH_OR] =
				md->or_max - touch->abs[PT_TCH_OR];
		else
			touch->abs[PT_TCH_OR] =
				md->or_min - touch->abs[PT_TCH_OR];
		flipped = true;
	} else
		flipped = false;

	/*
	 * 1 is subtracted from each touch location to make the location
	 * 0 based. e.g. If the resolution of touch panel is 1200x1600,
	 * the FW touch report must be (0~1199,0~1599). The driver
	 * should register the (min,max) value to Linux input system as
	 * (0~1199,0~1599). When the host needs to invert the
	 * coordinates, the driver would incorrectly use the resolution
	 * to subtract the reported point directly, such as
	 * 1200-(0~1199). The input system will lose the 0 point report
	 * and the 1200 point will be ignored.
	 */
	if (md->pdata->flags & PT_MT_FLAG_INV_X) {
		if (flipped)
			touch->abs[PT_TCH_X] = si->sensing_conf_data.res_y -
				touch->abs[PT_TCH_X] - 1;
		else
			touch->abs[PT_TCH_X] = si->sensing_conf_data.res_x -
				touch->abs[PT_TCH_X] - 1;
		touch->abs[PT_TCH_OR] *= -1;
	}
	if (md->pdata->flags & PT_MT_FLAG_INV_Y) {
		if (flipped)
			touch->abs[PT_TCH_Y] = si->sensing_conf_data.res_x -
				touch->abs[PT_TCH_Y] - 1;
		else
			touch->abs[PT_TCH_Y] = si->sensing_conf_data.res_y -
				touch->abs[PT_TCH_Y] - 1;
		touch->abs[PT_TCH_OR] *= -1;
	}

	/* Convert MAJOR/MINOR from mm to resolution */
	tmp = touch->abs[PT_TCH_MAJ] * 100 * si->sensing_conf_data.res_x;
	touch->abs[PT_TCH_MAJ] = tmp / si->sensing_conf_data.len_x;
	tmp = touch->abs[PT_TCH_MIN] * 100 * si->sensing_conf_data.res_x;
	touch->abs[PT_TCH_MIN] = tmp / si->sensing_conf_data.len_x;

	pt_debug(dev, DL_INFO,
		"%s: flip=%s inv-x=%s inv-y=%s x=%04X(%d) y=%04X(%d)\n",
		__func__, flipped ? "true" : "false",
		md->pdata->flags & PT_MT_FLAG_INV_X ? "true" : "false",
		md->pdata->flags & PT_MT_FLAG_INV_Y ? "true" : "false",
		touch->abs[PT_TCH_X], touch->abs[PT_TCH_X],
		touch->abs[PT_TCH_Y], touch->abs[PT_TCH_Y]);
}

/*******************************************************************************
 * FUNCTION: pt_report_event
 *
 * SUMMARY: Reports touch event
 *
 * PARAMETERS:
 *     *md      - pointer to touch data structure
 *      event   - type of touch event
 *      value   - value of report event
 ******************************************************************************/
static void pt_report_event(struct pt_mt_data *md, int event,
		int value)
{
	int sig = MT_PARAM_SIGNAL(md, event);

	if (sig != PT_IGNORE_VALUE)
		input_report_abs(md->input, sig, value);
}

/*******************************************************************************
 * FUNCTION: pt_get_mt_touches
 *
 * SUMMARY: Parse and report touch event
 *
 * PARAMETERS:
 *     *md          - pointer to touch data structure
 *     *tch         - pointer to touch structure
 *      num_cur_tch - number of current touch
 ******************************************************************************/
static void pt_get_mt_touches(struct pt_mt_data *md,
		struct pt_touch *tch, int num_cur_tch)
{
	struct device *dev = md->dev;
	struct pt_sysinfo *si = md->si;
	int sig;
	int i, j, t = 0;
	DECLARE_BITMAP(ids, PT_TOUCH_ID_MAX);
	int mt_sync_count = 0;
	u8 *tch_addr;

	if (PT_TOUCH_ID_MAX < si->tch_abs[PT_TCH_T].max) {
		pt_debug(dev, DL_ERROR,
			"%s: Touch ID num %d is allocated less than needed %d\n",
			__func__, PT_TOUCH_ID_MAX, si->tch_abs[PT_TCH_T].max);
		return;
	}

	bitmap_zero(ids, PT_TOUCH_ID_MAX);
	memset(tch->abs, 0, sizeof(tch->abs));

	for (i = 0; i < num_cur_tch; i++) {
		tch_addr = si->xy_data + (i * si->desc.tch_record_size);
		pt_get_touch_record(md, tch, tch_addr);

		/*  Discard proximity event */
		if (tch->abs[PT_TCH_O] == PT_OBJ_PROXIMITY) {
			pt_debug(dev, DL_INFO,
				"%s: Discarding proximity event\n",
				__func__);
			continue;
		}

		/* Validate track_id */
		t = tch->abs[PT_TCH_T];
		if (t < md->t_min || t > md->t_max) {
			pt_debug(dev, DL_INFO,
				"%s: tch=%d -> bad trk_id=%d max_id=%d\n",
				__func__, i, t, md->t_max);
			if (md->mt_function.input_sync)
				md->mt_function.input_sync(md->input);
			mt_sync_count++;
			continue;
		}

		/* Lift-off */
		if (tch->abs[PT_TCH_E] == PT_EV_LIFTOFF) {
			pt_debug(dev, DL_INFO, "%s: t=%d e=%d lift-off\n",
				__func__, t, tch->abs[PT_TCH_E]);
			goto pt_get_mt_touches_pr_tch;
		}

		/* Process touch */
		pt_mt_process_touch(md, tch);

		/* use 0 based track id's */
		t -= md->t_min;

		sig = MT_PARAM_SIGNAL(md, PT_ABS_ID_OST);
		if (sig != PT_IGNORE_VALUE) {
			if (md->mt_function.input_report)
				md->mt_function.input_report(md->input, sig,
						t, tch->abs[PT_TCH_O]);
			__set_bit(t, ids);
		}

		pt_report_event(md, PT_ABS_D_OST, 0);

		/* all devices: position and pressure fields */
		for (j = 0; j <= PT_ABS_W_OST; j++) {
			if (!si->tch_abs[j].report)
				continue;
			pt_report_event(md, PT_ABS_X_OST + j,
					tch->abs[PT_TCH_X + j]);
		}

		/* Get the extended touch fields */
		for (j = 0; j < PT_NUM_EXT_TCH_FIELDS; j++) {
			if (!si->tch_abs[PT_ABS_MAJ_OST + j].report)
				continue;
			pt_report_event(md, PT_ABS_MAJ_OST + j,
					tch->abs[PT_TCH_MAJ + j]);
		}
		if (md->mt_function.input_sync)
			md->mt_function.input_sync(md->input);
		mt_sync_count++;

pt_get_mt_touches_pr_tch:
		pt_debug(dev, DL_INFO,
			"%s: t=%d x=%d y=%d z=%d M=%d m=%d o=%d e=%d obj=%d tip=%d\n",
			__func__, t,
			tch->abs[PT_TCH_X],
			tch->abs[PT_TCH_Y],
			tch->abs[PT_TCH_P],
			tch->abs[PT_TCH_MAJ],
			tch->abs[PT_TCH_MIN],
			tch->abs[PT_TCH_OR],
			tch->abs[PT_TCH_E],
			tch->abs[PT_TCH_O],
			tch->abs[PT_TCH_TIP]);
	}

	if (md->mt_function.final_sync)
		md->mt_function.final_sync(md->input,
				si->tch_abs[PT_TCH_T].max, mt_sync_count, ids);

	md->num_prv_rec = num_cur_tch;
}

/*******************************************************************************
 * FUNCTION: pt_xy_worker
 *
 * SUMMARY: Read xy_data for all current touches
 *
 * RETURN:
 *	 0 = success
 *	!0 = failure
 *
 * PARAMETERS:
 *     *md - pointer to touch data structure
 ******************************************************************************/
static int pt_xy_worker(struct pt_mt_data *md)
{
	struct device *dev = md->dev;
	struct pt_sysinfo *si = md->si;
	int max_tch = si->sensing_conf_data.max_tch;
	struct pt_touch tch;
	u8 num_cur_tch;
	int rc = 0;

	pt_get_touch_hdr(md, &tch, si->xy_mode + 3);

	num_cur_tch = tch.hdr[PT_TCH_NUM];
	if (num_cur_tch > max_tch) {
		pt_debug(dev, DL_ERROR, "%s: Num touch err detected (n=%d)\n",
			__func__, num_cur_tch);
		num_cur_tch = max_tch;
	}

	if (tch.hdr[PT_TCH_LO]) {
		pt_debug(dev, DL_INFO, "%s: Large area detected\n",
			__func__);
		if (md->pdata->flags & PT_MT_FLAG_NO_TOUCH_ON_LO)
			num_cur_tch = 0;
	}

	if (num_cur_tch == 0 && md->num_prv_rec == 0)
		goto pt_xy_worker_exit;

	/* extract xy_data for all currently reported touches */
	pt_debug(dev, DL_DEBUG, "%s: extract data num_cur_tch=%d\n",
		__func__, num_cur_tch);
	if (num_cur_tch)
		pt_get_mt_touches(md, &tch, num_cur_tch);
	else
		pt_mt_lift_all(md);

	rc = 0;

pt_xy_worker_exit:
	return rc;
}

/*******************************************************************************
 * FUNCTION: pt_mt_send_dummy_event
 *
 * SUMMARY: Send dummy/key event to wakeup upper layer of system
 *
 * PARAMETERS:
 *     *cd  - pointer to core data structure
 *     *md  - pointer to touch data structure
 ******************************************************************************/
static void pt_mt_send_dummy_event(struct pt_core_data *cd,
		struct pt_mt_data *md)
{
#ifndef EASYWAKE_TSG6
	/* TSG5 EasyWake */
	unsigned long ids = 0;

	/* for easy wakeup */
	if (md->mt_function.input_report)
		md->mt_function.input_report(md->input, ABS_MT_TRACKING_ID,
			0, PT_OBJ_STANDARD_FINGER);
	if (md->mt_function.input_sync)
		md->mt_function.input_sync(md->input);
	if (md->mt_function.final_sync)
		md->mt_function.final_sync(md->input, 0, 1, &ids);
	if (md->mt_function.report_slot_liftoff)
		md->mt_function.report_slot_liftoff(md, 1);
	if (md->mt_function.final_sync)
		md->mt_function.final_sync(md->input, 1, 1, &ids);
#else
	/* TSG6 FW1.3 and above only. TSG6 FW1.0 - 1.2 does not */
	/*  support EasyWake, and this function will not be called */
	u8 key_value = 0;

	switch (cd->gesture_id) {
	case GESTURE_DOUBLE_TAP:
		key_value = KEY_WAKEUP;
		break;
	case GESTURE_TWO_FINGERS_SLIDE:
		key_value = KEY_WAKEUP;
		break;
	case GESTURE_TOUCH_DETECTED:
		key_value = KEY_WAKEUP;
		break;
	case GESTURE_PUSH_BUTTON:
		key_value = KEY_F4;
		break;
	case GESTURE_SINGLE_SLIDE_DE_TX:
		key_value = KEY_F5;
		break;
	case GESTURE_SINGLE_SLIDE_IN_TX:
		key_value = KEY_F6;
		break;
	case GESTURE_SINGLE_SLIDE_DE_RX:
		key_value = KEY_F7;
		break;
	case GESTURE_SINGLE_SLIDE_IN_RX:
		key_value = KEY_F8;
		break;
	default:
		break;
	}

	if (key_value > 0) {
		input_report_key(md->input, key_value, 1);
		input_sync(md->input);
		input_report_key(md->input, key_value, 0);
		input_sync(md->input);
	}

	/*
	 * Caution - this debug print is needed by the TTDL automated
	 *           regression test suite
	 */
	pt_debug(md->dev, DL_INFO, "%s: report key: %d\n",
		__func__, key_value);
#endif
}

/*******************************************************************************
 * FUNCTION: pt_mt_attention
 *
 * SUMMARY: Wrapper function for pt_xy_worker() that subscribe into the TTDL
 *  attention list.
 *
 * RETURN:
 *	 0 = success
 *	!0 = failure
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_mt_attention(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;
	int rc;

	if (md->si->xy_mode[2] !=  md->si->desc.tch_report_id)
		return 0;

	/* core handles handshake */
	mutex_lock(&md->mt_lock);
	rc = pt_xy_worker(md);
	mutex_unlock(&md->mt_lock);
	if (rc < 0)
		pt_debug(dev, DL_ERROR,
			"%s: xy_worker error r=%d\n", __func__, rc);

	return rc;
}

/*******************************************************************************
 * FUNCTION: pt_mt_wake_attention
 *
 * SUMMARY: Wrapper function for pt_mt_send_dummy_event() that register to
 *  attention list.
 *
 * RETURN:
 *	 0 = success
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_mt_wake_attention(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;

	mutex_lock(&md->mt_lock);
	pt_mt_send_dummy_event(cd, md);
	mutex_unlock(&md->mt_lock);
	return 0;
}

/*******************************************************************************
 * FUNCTION: pt_startup_attention
 *
 * SUMMARY: Wrapper function for pt_mt_lift_all() that subcribe into the TTDL
 *  attention list.
 *
 * RETURN:
 *	 0 = success
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_startup_attention(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;

	mutex_lock(&md->mt_lock);
	pt_mt_lift_all(md);
	mutex_unlock(&md->mt_lock);

	return 0;
}

/*******************************************************************************
 * FUNCTION: pt_mt_suspend_attention
 *
 * SUMMARY: Function for touch to enter suspend state that as following steps:
 *          1) Lift all touch
 *          2) Set flag with suspend state
 *          3) Decrese pm system count
 *
 * RETURN:
 *	 0 = success
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_mt_suspend_attention(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;

	mutex_lock(&md->mt_lock);
	pt_mt_lift_all(md);
	md->is_suspended = true;
	mutex_unlock(&md->mt_lock);

	pm_runtime_put(dev);

	return 0;
}

/*******************************************************************************
 * FUNCTION: pt_mt_resume_attention
 *
 * SUMMARY: Function for touch to leave suspend state that as following steps:
 *          1) Increse pm system count
 *          2) Clear suspend state flag
 *
 * RETURN:
 *	 0 = success
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_mt_resume_attention(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;

	pm_runtime_get(dev);

	mutex_lock(&md->mt_lock);
	md->is_suspended = false;
	mutex_unlock(&md->mt_lock);

	return 0;
}

/*******************************************************************************
 * FUNCTION: pt_mt_open
 *
 * SUMMARY: Open method for input device(touch) that sets up call back
 *  functions to TTDL attention list
 *
 * RETURN:
 *	 0 = success
 *
 * PARAMETERS:
 *     *input - pointer to input_dev structure
 ******************************************************************************/
static int pt_mt_open(struct input_dev *input)
{
	struct device *dev = input->dev.parent;
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;

	pm_runtime_get_sync(dev);

	mutex_lock(&md->mt_lock);
	md->is_suspended = false;
	mutex_unlock(&md->mt_lock);

	pt_debug(dev, DL_INFO, "%s: setup subscriptions\n", __func__);

	/* set up touch call back */
	_pt_subscribe_attention(dev, PT_ATTEN_IRQ, PT_MT_NAME,
		pt_mt_attention, PT_MODE_OPERATIONAL);

	/* set up startup call back */
	_pt_subscribe_attention(dev, PT_ATTEN_STARTUP, PT_MT_NAME,
		pt_startup_attention, 0);

	/* set up wakeup call back */
	_pt_subscribe_attention(dev, PT_ATTEN_WAKE, PT_MT_NAME,
		pt_mt_wake_attention, 0);

	/* set up suspend call back */
	_pt_subscribe_attention(dev, PT_ATTEN_SUSPEND, PT_MT_NAME,
		pt_mt_suspend_attention, 0);

	/* set up resume call back */
	_pt_subscribe_attention(dev, PT_ATTEN_RESUME, PT_MT_NAME,
		pt_mt_resume_attention, 0);

	return 0;
}

/*******************************************************************************
 * FUNCTION: pt_mt_close
 *
 * SUMMARY: Close method for input device(touch) that clears call back
 *  functions from TTDL attention list.
 *
 * PARAMETERS:
 *     *input - pointer to input_dev structure
 ******************************************************************************/
static void pt_mt_close(struct input_dev *input)
{
	struct device *dev = input->dev.parent;
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;

	_pt_unsubscribe_attention(dev, PT_ATTEN_IRQ, PT_MT_NAME,
		pt_mt_attention, PT_MODE_OPERATIONAL);

	_pt_unsubscribe_attention(dev, PT_ATTEN_STARTUP, PT_MT_NAME,
		pt_startup_attention, 0);

	_pt_unsubscribe_attention(dev, PT_ATTEN_WAKE, PT_MT_NAME,
		pt_mt_wake_attention, 0);

	_pt_unsubscribe_attention(dev, PT_ATTEN_SUSPEND, PT_MT_NAME,
		pt_mt_suspend_attention, 0);

	_pt_unsubscribe_attention(dev, PT_ATTEN_RESUME, PT_MT_NAME,
		pt_mt_resume_attention, 0);

	mutex_lock(&md->mt_lock);
	if (!md->is_suspended) {
		pm_runtime_put(dev);
		md->is_suspended = true;
	}
	mutex_unlock(&md->mt_lock);
}

/*******************************************************************************
 * FUNCTION: pt_setup_input_device
 *
 * SUMMARY: Set up resolution, event signal capabilities and
 *  register input device for touch.
 *
 * RETURN:
 *	 0 = success
 *	!0 = failure
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_setup_input_device(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;
	int signal = PT_IGNORE_VALUE;
	int max_x, max_y, max_p, min, max;
	int max_x_tmp, max_y_tmp;
	int i;
	int rc;

	pt_debug(dev, DL_INFO, "%s: Initialize event signals\n",
		__func__);
	__set_bit(EV_ABS, md->input->evbit);
	__set_bit(EV_REL, md->input->evbit);
	__set_bit(EV_KEY, md->input->evbit);
#ifdef INPUT_PROP_DIRECT
	__set_bit(INPUT_PROP_DIRECT, md->input->propbit);
#endif

	/* If virtualkeys enabled, don't use all screen */
	if (md->pdata->flags & PT_MT_FLAG_VKEYS) {
		max_x_tmp = md->pdata->vkeys_x;
		max_y_tmp = md->pdata->vkeys_y;
	} else {
		max_x_tmp = md->si->sensing_conf_data.res_x;
		max_y_tmp = md->si->sensing_conf_data.res_y;
	}

	/* get maximum values from the sysinfo data */
	if (md->pdata->flags & PT_MT_FLAG_FLIP) {
		max_x = max_y_tmp - 1;
		max_y = max_x_tmp - 1;
	} else {
		max_x = max_x_tmp - 1;
		max_y = max_y_tmp - 1;
	}
	max_p = md->si->sensing_conf_data.max_z;

	/* set event signal capabilities */
	for (i = 0; i < NUM_SIGNALS(md->pdata->frmwrk); i++) {
		signal = MT_PARAM_SIGNAL(md, i);
		if (signal != PT_IGNORE_VALUE) {
			__set_bit(signal, md->input->absbit);

			min = MT_PARAM_MIN(md, i);
			max = MT_PARAM_MAX(md, i);
			if (i == PT_ABS_ID_OST) {
				/* shift track ids down to start at 0 */
				max = max - min;
				min = min - min;
			} else if (i == PT_ABS_X_OST)
				max = max_x;
			else if (i == PT_ABS_Y_OST)
				max = max_y;
			else if (i == PT_ABS_P_OST)
				max = max_p;

			input_set_abs_params(md->input, signal, min, max,
				MT_PARAM_FUZZ(md, i), MT_PARAM_FLAT(md, i));
			pt_debug(dev, DL_INFO,
				"%s: register signal=%02X min=%d max=%d\n",
				__func__, signal, min, max);
		}
	}

	md->or_min = MT_PARAM_MIN(md, PT_ABS_OR_OST);
	md->or_max = MT_PARAM_MAX(md, PT_ABS_OR_OST);

	md->t_min = MT_PARAM_MIN(md, PT_ABS_ID_OST);
	md->t_max = MT_PARAM_MAX(md, PT_ABS_ID_OST);

	rc = md->mt_function.input_register_device(md->input,
			md->si->tch_abs[PT_TCH_T].max);
	if (rc < 0)
		pt_debug(dev, DL_ERROR, "%s: Error, failed register input device r=%d\n",
			__func__, rc);
	else
		md->input_device_registered = true;

#ifdef EASYWAKE_TSG6
	input_set_capability(md->input, EV_KEY, KEY_F1);
	input_set_capability(md->input, EV_KEY, KEY_F2);
	input_set_capability(md->input, EV_KEY, KEY_F3);
	input_set_capability(md->input, EV_KEY, KEY_F4);
	input_set_capability(md->input, EV_KEY, KEY_F5);
	input_set_capability(md->input, EV_KEY, KEY_F6);
	input_set_capability(md->input, EV_KEY, KEY_F7);
	input_set_capability(md->input, EV_KEY, KEY_F8);
	input_set_capability(md->input, EV_KEY, KEY_WAKEUP);
#endif
	return rc;
}

/*******************************************************************************
 * FUNCTION: pt_setup_input_attention
 *
 * SUMMARY: Wrapper function for pt_setup_input_device() register to TTDL
 *  attention list.
 *
 * RETURN:
 *	 0 = success
 *	!0 = failure
 *
 * PARAMETERS:
 *     *dev - pointer to device structure
 ******************************************************************************/
static int pt_setup_input_attention(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;
	int rc;

	md->si = _pt_request_sysinfo(dev);
	if (!md->si)
		return -EINVAL;

	rc = pt_setup_input_device(dev);

	_pt_unsubscribe_attention(dev, PT_ATTEN_STARTUP, PT_MT_NAME,
		pt_setup_input_attention, 0);

	return rc;
}

/*******************************************************************************
 * FUNCTION: pt_mt_probe
 *
 * SUMMARY: The probe function for touch input device
 *
 * RETURN:
 *	 0 = success
 *	!0 = failure
 *
 * PARAMETERS:
 *	*dev   - pointer to device structure
 ******************************************************************************/
int pt_mt_probe(struct device *dev)
{
	struct pt_core_data *cd = dev_get_drvdata(dev);
	struct pt_mt_data *md = &cd->md;
	struct pt_platform_data *pdata = dev_get_platdata(dev);
	struct pt_mt_platform_data *mt_pdata;
	int rc = 0;

	pt_debug(dev, DL_INFO,
		"%s: >>>>>> Register MT <<<<<<\n", __func__);
	if (!pdata || !pdata->mt_pdata) {
		pt_debug(dev, DL_ERROR,
			"%s: Missing platform data\n", __func__);
		rc = -ENODEV;
		goto error_no_pdata;
	}
	mt_pdata = pdata->mt_pdata;

	pt_init_function_ptrs(md);

	mutex_init(&md->mt_lock);
	md->dev = dev;
	md->pdata = mt_pdata;

	/* Create the input device and register it. */
	pt_debug(dev, DL_INFO,
		"%s: Create the input device and register it\n", __func__);
	md->input = input_allocate_device();
	if (!md->input) {
		pt_debug(dev, DL_ERROR, "%s: Error, failed to allocate input device\n",
			__func__);
		rc = -ENODEV;
		goto error_alloc_failed;
	} else
		md->input_device_allocated = true;

	if (md->pdata->inp_dev_name)
		md->input->name = md->pdata->inp_dev_name;
	else
		md->input->name = PT_MT_NAME;
	scnprintf(md->phys, sizeof(md->phys), "%s/input%d", dev_name(dev),
			cd->phys_num++);
	md->input->phys = md->phys;
	md->input->dev.parent = md->dev;
	md->input->open = pt_mt_open;
	md->input->close = pt_mt_close;
	input_set_drvdata(md->input, md);

	/* get sysinfo */
	md->si = _pt_request_sysinfo(dev);

	if (md->si) {
		rc = pt_setup_input_device(dev);
		if (rc)
			goto error_init_input;
	} else {
		pt_debug(dev, DL_ERROR, "%s: Fail get sysinfo pointer from core p=%p\n",
			__func__, md->si);
		_pt_subscribe_attention(dev, PT_ATTEN_STARTUP,
			PT_MT_NAME, pt_setup_input_attention, 0);
	}

	return 0;

error_init_input:
	input_free_device(md->input);
	md->input_device_allocated = false;
error_alloc_failed:
error_no_pdata:
	pt_debug(dev, DL_ERROR, "%s failed.\n", __func__);
	return rc;
}

/*******************************************************************************
 * FUNCTION: pt_mt_release
 *
 * SUMMARY: The release function for touch input device
 *
 * RETURN:
 *	 0 = success
 *
 * PARAMETERS:
 *	*dev   - pointer to device structure
 ******************************************************************************/
int pt_mt_release(struct device *dev)
{
	struct pt_core_data *cd;
	struct pt_mt_data *md;

	/* Ensure valid pointers before de-referencing them */
	if (dev) {
		cd = dev_get_drvdata(dev);
		if (cd)
			md = &cd->md;
		else
			return 0;
	} else {
		return 0;
	}

	/*
	 * Second call this function may cause kernel panic if probe fail.
	 * Use input_device_registered & input_device_allocated variable to
	 * avoid unregister or free unavailable devive.
	 */
	if (md && md->input_device_registered) {
		md->input_device_registered = false;
		input_unregister_device(md->input);
		/* Unregistering device will free the device too */
		md->input_device_allocated = false;
	} else if (md && md->input_device_allocated) {
		md->input_device_allocated = false;
		input_free_device(md->input);
		_pt_unsubscribe_attention(dev, PT_ATTEN_STARTUP,
			PT_MT_NAME, pt_setup_input_attention, 0);
	}

	return 0;
}