/*
 * SiI8620 Linux Driver
 *
 * Copyright (C) 2013-2014 Silicon Image, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 * This program is distributed AS-IS WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; INCLUDING without the implied warranty
 * of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE or NON-INFRINGEMENT.
 * See the GNU General Public License for more details at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 */

#ifdef MEDIA_DATA_TUNNEL_SUPPORT

#include <linux/input.h>
#include <linux/cdev.h>
#include <linux/hrtimer.h>
#include "si_fw_macros.h"
#include "si_infoframe.h"
#include "si_edid.h"
#include "si_mhl_defs.h"
#include "si_mhl2_edid_3d_api.h"
#include "si_mhl_tx_hw_drv_api.h"
#include "si_mdt_inputdev.h"
#include "mhl_linux_tx.h"
#include "platform.h"
#ifdef KERNEL_2_6_38_AND_LATER
#include <linux/input/mt.h>
#endif
#ifdef DEBUG
#include <linux/kernel.h>
#endif
/* keycode map from usbkbd.c */
uint8_t usb_kbd_keycode[256] = {
	0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
	50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44, 2, 3,
	4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 14, 15, 57, 12, 13, 26,
	27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
	65, 66, 67, 68, 87, 88, 99, 70, 119, 110, 102, 104, 111, 107, 109, 106,
	105, 108, 103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
	72, 73, 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189,
		190,
	191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
		136, 113,
	115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94, 95, 0, 0, 0,
	122, 123, 90, 91, 85, 0, 0, 0, 0, 0, 150, 155, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	200, 201, 207, 208, 213, 215, 216, 217, 226, 139, 172, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115, 114,
		113,
	150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
};

static bool is_mdt_dev_active(struct mhl_dev_context *dev_context,
			      enum mdt_dev_types_e dev_type)
{
	if (dev_context->mdt_devs.is_dev_registered[dev_type] == INPUT_ACTIVE)
		return true;
	else
		return false;
}

static bool is_mdt_dev_waiting(struct mhl_dev_context *dev_context,
			       enum mdt_dev_types_e dev_type)
{
	if (dev_context->mdt_devs.is_dev_registered[dev_type] ==
	    INPUT_WAITING_FOR_REGISTRATION)
		return true;
	else
		return false;
}

static void destroy_mouse(struct mhl_dev_context *dev_context)
{
	if (dev_context->mdt_devs.dev_mouse == NULL)
		return;

	MHL_TX_DBG_INFO("Unregistering mouse: %pK\n",
			dev_context->mdt_devs.dev_mouse);
	input_unregister_device(dev_context->mdt_devs.dev_mouse);
	MHL_TX_DBG_INFO("Freeing mouse: %pK\n",
		dev_context->mdt_devs.dev_mouse);
	input_free_device(dev_context->mdt_devs.dev_mouse);
	dev_context->mdt_devs.dev_mouse = NULL;
}

static void destroy_keyboard(struct mhl_dev_context *dev_context)
{
	if (dev_context->mdt_devs.dev_keyboard == NULL)
		return;

	MHL_TX_DBG_INFO("Unregistering keyboard: %pK\n",
			dev_context->mdt_devs.dev_keyboard);
	input_unregister_device(dev_context->mdt_devs.dev_keyboard);
	MHL_TX_DBG_INFO("Freeing keyboard: %pK\n",
			dev_context->mdt_devs.dev_keyboard);
	input_free_device(dev_context->mdt_devs.dev_keyboard);
	dev_context->mdt_devs.dev_keyboard = NULL;
}

static void destroy_touchscreen(struct mhl_dev_context *dev_context)
{
	if (dev_context->mdt_devs.dev_touchscreen == NULL)
		return;

	MHL_TX_DBG_INFO("Unregistering mouse: %pK\n",
			dev_context->mdt_devs.dev_touchscreen);
	input_unregister_device(dev_context->mdt_devs.dev_touchscreen);
	MHL_TX_DBG_INFO("Freeing mouse: %pK\n",
			dev_context->mdt_devs.dev_touchscreen);
	input_free_device(dev_context->mdt_devs.dev_touchscreen);
	dev_context->mdt_devs.dev_touchscreen = NULL;
	memset(dev_context->mdt_devs.prior_touch_events, 0,
	       MAX_TOUCH_CONTACTS *
	       sizeof(dev_context->mdt_devs.prior_touch_events[0]));
}

int init_mdt_keyboard(struct mhl_dev_context *dev_context)
{
	int i;
	uint8_t error;
	struct input_dev *dev_keyboard;

	dev_keyboard = input_allocate_device();
	if (!dev_keyboard) {
		MHL_TX_DBG_ERR("Not enough memory\n");
		return -ENOMEM;
	}
	MHL_TX_DBG_INFO("Allocated keyboard: %pK\n", dev_keyboard);

	set_bit(EV_KEY, dev_keyboard->evbit);
	set_bit(EV_REP, dev_keyboard->evbit);

	dev_keyboard->phys = "mdt_kbd/input0";
	dev_keyboard->name = "MDTkeyboard";
	dev_keyboard->keycode = usb_kbd_keycode;
	dev_keyboard->keycodesize = sizeof(unsigned char);
	dev_keyboard->keycodemax = ARRAY_SIZE(usb_kbd_keycode);

	for (i = 1; i < 256; i++)
		set_bit(usb_kbd_keycode[i], dev_keyboard->keybit);

	dev_keyboard->id.bustype = BUS_VIRTUAL;
	dev_keyboard->id.vendor = 0x1095;
	dev_keyboard->id.product = MHL_PRODUCT_NUM;

	/* Use version to distinguish between devices */
	dev_keyboard->id.version = 0xA;

	error = input_register_device(dev_keyboard);
	if (error) {
		MHL_TX_DBG_ERR("Failed to register device\n");
		input_free_device(dev_keyboard);
		return error;
	}

	MHL_TX_DBG_INFO("Registered keyboard: %pK\n", dev_keyboard);

	dev_context->mdt_devs.dev_keyboard = dev_keyboard;

	return 0;
}

int init_mdt_mouse(struct mhl_dev_context *dev_context)
{
	uint8_t error;
	struct input_dev *dev_mouse;

	dev_mouse = input_allocate_device();
	if (!dev_mouse) {
		MHL_TX_DBG_ERR("Not enough memory\n");
		return -ENOMEM;
	}
	MHL_TX_DBG_INFO("Allocated mouse: %pK\n", dev_mouse);

	set_bit(EV_REL, dev_mouse->evbit);
	set_bit(EV_KEY, dev_mouse->evbit);
	set_bit(BTN_LEFT, dev_mouse->keybit);
	set_bit(BTN_RIGHT, dev_mouse->keybit);
	set_bit(BTN_MIDDLE, dev_mouse->keybit);
	set_bit(BTN_SIDE, dev_mouse->keybit);
	set_bit(BTN_EXTRA, dev_mouse->keybit);
	set_bit(REL_X, dev_mouse->relbit);
	set_bit(REL_Y, dev_mouse->relbit);
	set_bit(REL_WHEEL, dev_mouse->relbit);
#if (RIGHT_MOUSE_BUTTON_IS_ESC == 1)
	set_bit(KEY_ESC, dev_mouse->keybit);
	dev_context->mdt_devs.prior_right_button = 0;
#endif

	dev_mouse->phys = "mdt_mouse/input0";
	dev_mouse->name = "MDTmouse";
	dev_mouse->id.bustype = BUS_VIRTUAL;
	dev_mouse->id.vendor = 0x1095;
	dev_mouse->id.product = MHL_PRODUCT_NUM;

	/* Use version to distinguish between devices */
	dev_mouse->id.version = 0xB;

	error = input_register_device(dev_mouse);
	if (error) {
		MHL_TX_DBG_ERR("Failed to register device\n");
		input_free_device(dev_mouse);
		return error;
	}

	MHL_TX_DBG_INFO("Registered mouse: %pK\n", dev_mouse);

	dev_context->mdt_devs.dev_mouse = dev_mouse;

	return 0;
}

int init_mdt_touchscreen(struct mhl_dev_context *dev_context)
{
	uint8_t error;
	struct input_dev *dev_touchscreen;

	dev_touchscreen = input_allocate_device();
	if (!dev_touchscreen) {
		MHL_TX_DBG_ERR("Not enough memory\n");
		return -ENOMEM;
	}

	MHL_TX_DBG_INFO("Allocated touch screen: %pK\n", dev_touchscreen);

#if !defined(SINGLE_TOUCH) && defined(KERNEL_2_6_38_AND_LATER)
	input_mt_init_slots(dev_touchscreen, MAX_TOUCH_CONTACTS);
#endif

	dev_touchscreen->phys = "mdt_touch/input0";
	dev_touchscreen->name = "MDTtouchscreen";
	dev_touchscreen->id.bustype = BUS_VIRTUAL;
	dev_touchscreen->id.vendor = 0x1095;
	dev_touchscreen->id.product = MHL_PRODUCT_NUM;

	/* use version to distinguish between devices */
	dev_touchscreen->id.version = 0xC;

#if defined(SINGLE_TOUCH)
	__set_bit(EV_ABS, dev_touchscreen->evbit);
	__set_bit(ABS_X, dev_touchscreen->absbit);
	__set_bit(ABS_Y, dev_touchscreen->absbit);
	__set_bit(EV_KEY, dev_touchscreen->evbit);
#if     (CORNER_BUTTON == 1)
	__set_bit(KEY_ESC, dev_touchscreen->keybit);
#endif
	__set_bit(BTN_TOUCH, dev_touchscreen->keybit);
#ifdef KERNEL_2_6_38_AND_LATER
	__set_bit(INPUT_PROP_DIRECT, dev_touchscreen->propbit);
#endif
	input_set_abs_params(dev_touchscreen, ABS_X, 0,
			     dev_context->mdt_devs.x_max, 0, 0);
	input_set_abs_params(dev_touchscreen, ABS_Y, 0,
			     dev_context->mdt_devs.y_max, 0, 0);
#else

	__set_bit(EV_ABS, dev_touchscreen->evbit);
	__set_bit(EV_KEY, dev_touchscreen->evbit);
#ifdef KERNEL_2_6_38_AND_LATER
	__set_bit(EV_SYN, dev_touchscreen->evbit);
	__set_bit(MT_TOOL_FINGER, dev_touchscreen->keybit);
	__set_bit(INPUT_PROP_DIRECT, dev_touchscreen->propbit);
	input_mt_init_slots(dev_touchscreen, MAX_TOUCH_CONTACTS);
#else
	__set_bit(BTN_TOUCH, dev_touchscreen->keybit);
	input_set_abs_params(dev_touchscreen, ABS_MT_WIDTH_MAJOR, 0, 3, 0, 0);
	input_set_abs_params(dev_touchscreen, ABS_MT_TRACKING_ID, 0, 3, 0, 0);
#endif
#if (CORNER_BUTTON == 1)
	__set_bit(KEY_ESC, dev_touchscreen->keybit);
#endif
	input_set_abs_params(dev_touchscreen, ABS_MT_TOUCH_MAJOR, 0, 30, 0, 0);
	input_set_abs_params(dev_touchscreen, ABS_MT_PRESSURE, 0, 255, 0, 0);
	input_set_abs_params(dev_touchscreen, ABS_MT_POSITION_X, 0,
			     dev_context->mdt_devs.x_max, 0, 0);
	input_set_abs_params(dev_touchscreen, ABS_MT_POSITION_Y, 0,
			     dev_context->mdt_devs.y_max, 0, 0);

#endif

#if (JB_421 == 1) && (ICS_BAR == 1)
#if (Y_BUTTON_RECENTAPPS_TOP != 0)
	__set_bit(KEY_MENU, dev_touchscreen->keybit);
#endif
#if (Y_BUTTON_HOME_TOP != 0)
	__set_bit(KEY_HOMEPAGE, dev_touchscreen->keybit);
#endif
#if (Y_BUTTON_BACK_TOP != 0)
	__set_bit(KEY_BACK, dev_touchscreen->keybit);
#endif
#endif

	error = input_register_device(dev_touchscreen);
	if (error) {
		MHL_TX_DBG_ERR("Failed to register device\n");
		input_free_device(dev_touchscreen);
		return error;
	}
	MHL_TX_DBG_INFO("Registered touchscreen: %pK\n", dev_touchscreen);

	dev_context->mdt_devs.dev_touchscreen = dev_touchscreen;

	/* initialize history; in parcitular initialize state elements with
	 * MDT_TOUCH_INACTIVE
	 */
	memset(dev_context->mdt_devs.prior_touch_events, 0,
	       MAX_TOUCH_CONTACTS *
	       sizeof(dev_context->mdt_devs.prior_touch_events[0]));

	return 0;
}

static int destroy_device(struct mhl_dev_context *dev_context,
			  enum mdt_dev_types_e mdt_device_type)
{
	if ((mdt_device_type >= MDT_TYPE_COUNT) ||
	    (is_mdt_dev_active(dev_context, mdt_device_type) == 0)) {
		MHL_TX_DBG_INFO("FAILURE. Invalid disconnect request.\n",
				mdt_device_type);
		return REGISTRATION_ERROR;
	}

	switch (mdt_device_type) {
	case MDT_TYPE_MOUSE:
		destroy_mouse(dev_context);
		break;
	case MDT_TYPE_KEYBOARD:
		destroy_keyboard(dev_context);
		break;
	case MDT_TYPE_TOUCHSCREEN:
		destroy_touchscreen(dev_context);
		break;
	default:
		/* redundant check to pacify the compiler */
		break;
	}

	dev_context->mdt_devs.is_dev_registered[mdt_device_type] =
	    INPUT_WAITING_FOR_REGISTRATION;

	MHL_TX_DBG_INFO
	    ("SUCCESS. Disconnect event handled for %d device type.\n",
	     mdt_device_type);

	return REGISTRATION_SUCCESS;
}

/* The recursive piece of the registration function. */
static int registration_helper(struct mhl_dev_context *dev_context,
			       enum mdt_dev_types_e mdt_device_type)
{
	switch (mdt_device_type) {
	case MDT_TYPE_KEYBOARD:
		if (dev_context->mdt_devs.dev_keyboard != 0)
			return REGISTRATION_SUCCESS;
		return init_mdt_keyboard(dev_context);
		break;
	case MDT_TYPE_MOUSE:
		if (dev_context->mdt_devs.dev_mouse != 0)
			return REGISTRATION_SUCCESS;
		if (init_mdt_mouse(dev_context) != REGISTRATION_SUCCESS)
			return REGISTRATION_ERROR;

		/* Do not support both a pointer and touch. */
		destroy_device(dev_context, MDT_TYPE_TOUCHSCREEN);
		break;
	case MDT_TYPE_TOUCHSCREEN:
		if (dev_context->mdt_devs.dev_touchscreen != 0)
			return REGISTRATION_SUCCESS;
		if (init_mdt_touchscreen(dev_context) != REGISTRATION_SUCCESS)
			return REGISTRATION_ERROR;

		/* Do not support both a pointer and touch. */
		destroy_device(dev_context, MDT_TYPE_MOUSE);
		break;
	case MDT_TYPE_COUNT:
		/*
		 * This case is out of range.
		 * Code is included to avoid compiler warning.
		 */
		break;
	}

	return REGISTRATION_SUCCESS;
}

static int register_device(struct mhl_dev_context *dev_context,
			   enum mdt_dev_types_e mdt_device_type)
{
	uint8_t error = 0;

	if ((mdt_device_type >= MDT_TYPE_COUNT) ||
	    (is_mdt_dev_waiting(dev_context, mdt_device_type) == false))
		return REGISTRATION_ERROR;

	/* Call recursive part of the function.
	   Don't update is_dev_registered there. */
	error = registration_helper(dev_context, mdt_device_type);

	if (error != REGISTRATION_SUCCESS) {
		dev_context->mdt_devs.is_dev_registered[mdt_device_type] =
		    INPUT_DISABLED;
		MHL_TX_DBG_INFO("SUCCESS. Device type %d registered.\n",
				mdt_device_type);
	} else {
		dev_context->mdt_devs.is_dev_registered[mdt_device_type] =
		    INPUT_ACTIVE;
		MHL_TX_DBG_INFO
		    ("FAILURE. Device type %d registration failed.\n",
		     mdt_device_type);
	}

	return error;
}

void generate_event_keyboard(struct mhl_dev_context *dev_context,
			     struct mdt_packet *keyboard_packet)
{
	struct input_dev *dev_keyboard = dev_context->mdt_devs.dev_keyboard;
	uint8_t *keycodes_new = dev_context->mdt_devs.keycodes_new;
	uint8_t *keycodes_old = dev_context->mdt_devs.keycodes_old;
	int i;

	register_device(dev_context, MDT_TYPE_KEYBOARD);

	memcpy(keycodes_new, &keyboard_packet->header, HID_INPUT_REPORT_CNT);
	MHL_TX_DBG_INFO("Key (scancode %02X) asserted.\n", keycodes_new[1]);

	if (dev_keyboard == 0) {
		MHL_TX_DBG_INFO("MDT_ERR_NOKEY\n");
		return;
	}

	/* following code was copied from usbkbd.c */
	/* generate events for CRL, SHIFT, and ALT keys */
	for (i = 0; i < 3; i++)
		input_report_key(dev_keyboard,
				 usb_kbd_keycode[i + 224],
				 (keycodes_new[0] >> i) & 1);

	/*
	 * Generate key press/release events for the
	 * remaining bytes in the input packet
	 */
	for (i = 1; i < 7; i++) {
		/* If keycode in pervious HID payload doesn't appear
		 * in NEW HID payload, generate de-assertion event
		 */
		if ((keycodes_old[i] > 3) &&
		    ((uint8_t *) memscan(keycodes_new + 1, keycodes_old[i], 6)
		     == ((uint8_t *) (keycodes_new) + 7))) {
			if (usb_kbd_keycode[keycodes_old[i]]) {
				input_report_key(dev_keyboard,
						 usb_kbd_keycode[keycodes_old
								 [i]], 0);
			} else {
				MHL_TX_DBG_INFO("Unknown key (scancode %#x) "
						"released.\n", keycodes_old[i]);
			}
		}

		/* If keycode in NEW HID paylaod doesn't appear in previous
		 * HID payload, generate assertion event
		 */
		if (keycodes_new[i] > 3 &&
		    memscan(keycodes_old + 1, keycodes_new[i],
			    6) == keycodes_old + 7) {
			if (usb_kbd_keycode[keycodes_new[i]]) {
				input_report_key(dev_keyboard,
						 usb_kbd_keycode[keycodes_new
								 [i]], 1);
			} else {
				MHL_TX_DBG_INFO("Unknown key (scancode %#x) "
						"pressed.\n", keycodes_new[i]);
			}
		}
	}

	input_sync(dev_keyboard);

	/* NEW HID payload is now OLD */
	memcpy(keycodes_old, keycodes_new, HID_INPUT_REPORT_CNT);
}

static void mdt_toggle_keycode(struct input_dev *hid_device,
			       unsigned char keycode)
{
	if (NULL == hid_device)
		return;

	input_report_key(hid_device, keycode, KEY_PRESSED);
	input_sync(hid_device);

	input_report_key(hid_device, keycode, KEY_RELEASED);
	input_sync(hid_device);
}

void mdt_toggle_keyboard_keycode(struct mhl_dev_context *dev_context,
				 unsigned char keycode)
{
	mdt_toggle_keycode(dev_context->mdt_devs.dev_keyboard, keycode);
}

void generate_event_mouse(struct mhl_dev_context *dev_context,
			  struct mdt_packet *mousePacket)
{
	struct input_dev *dev_mouse = dev_context->mdt_devs.dev_mouse;

	register_device(dev_context, MDT_TYPE_MOUSE);

	MHL_TX_DBG_INFO("mouse buttons (0x%02x)\n",
			mousePacket->header & MDT_HDR_MOUSE_BUTTON_MASK);

	if (dev_mouse == 0) {
		MHL_TX_DBG_ERR("MDT_ERR_NOMOUSE\n");
		return;
	}

	/* Translate and report mouse button changes */
	input_report_key(dev_mouse, BTN_LEFT,
			 mousePacket->header & MDT_HDR_MOUSE_BUTTON_1);

#if (RIGHT_MOUSE_BUTTON_IS_ESC == 1)
	if (mousePacket->header & MDT_HDR_MOUSE_BUTTON_2) {
		if (!dev_context->mdt_devs.prior_right_button) {
			dev_context->mdt_devs.prior_right_button = 1;
			mdt_toggle_keycode(dev_mouse, KEY_ESC);
		}
	} else
		dev_context->mdt_devs.prior_right_button = 0;
#else
	input_report_key(dev_mouse, BTN_RIGHT,
			 mousePacket->header & MDT_HDR_MOUSE_BUTTON_2);
#endif
	input_report_key(dev_mouse, BTN_MIDDLE,
			 mousePacket->header & MDT_HDR_MOUSE_BUTTON_3);

	input_report_rel(dev_mouse, REL_X,
			 mousePacket->event.mouse.x_displacement);

	input_report_rel(dev_mouse, REL_Y,
			 mousePacket->event.mouse.y_displacement);

	input_report_rel(dev_mouse, REL_WHEEL,
			 mousePacket->event.mouse.z_displacement);

	input_sync(dev_mouse);
}

static uint8_t process_touch_packet(struct mhl_dev_context *dev_context,
				    struct mdt_packet *touchPacket)
{
	struct mdt_touch_history_t *prior_event;
	int abs_x, abs_y;
	uint8_t isTouched = (touchPacket->header & 0x01);
	uint8_t contactID = ((touchPacket->header & 0x06) >> 1);

	prior_event =
	    (struct mdt_touch_history_t *)&(dev_context->mdt_devs.
					    prior_touch_events[contactID]);

	abs_x = touchPacket->event.touch_pad.x_abs_coordinate[MDT_TOUCH_X_LOW] |
	    (touchPacket->event.touch_pad.
	     x_abs_coordinate[MDT_TOUCH_X_HIGH] << 8);
	abs_y =
	    touchPacket->event.touch_pad.
	    y_abs_coordinate[MDT_TOUCH_Y_LOW] | (touchPacket->event.touch_pad.
						 y_abs_coordinate
						 [MDT_TOUCH_Y_HIGH] << 8);

#if (CORNER_BUTTON == 1)
	/* Handle LOWER RIGHT corner like a EXIT button (ESC key) */
	if ((abs_x > X_CORNER_RIGHT_LOWER) && (abs_y > Y_CORNER_RIGHT_LOWER)) {
		if (isTouched != dev_context->mdt_devs.prior_touch_button) {
			dev_context->mdt_devs.prior_touch_button = isTouched;
			if (isTouched)
				mdt_toggle_keycode(dev_context->mdt_devs.
						   dev_touchscreen, KEY_ESC);
		}
		return 0xFF;
	}
#elif (ICS_BAR == 1)
	/* JB421 doesn't allow this driver to trigger buttons on the bar.
	   implement custom buttons to workaround the problem. */
	if ((isTouched != dev_context->mdt_devs.prior_touch_button)
	    && (abs_x >= X_BUTTON_BAR_START)) {
		if ((abs_y > Y_BUTTON_RECENTAPPS_TOP)
		    && (abs_y < Y_BUTTON_RECENTAPPS_BOTTOM))
			mdt_toggle_keycode(dev_context->mdt_devs.
					   dev_touchscreen, KEY_MENU);
		else if ((abs_y > Y_BUTTON_HOME_TOP)
			 && (abs_y < Y_BUTTON_HOME_BOTTOM))
			mdt_toggle_keycode(dev_context->mdt_devs.
					   dev_touchscreen, KEY_HOMEPAGE);
		else if ((abs_y > Y_BUTTON_BACK_TOP)
			 && (abs_y < Y_BUTTON_BACK_BOTTOM))
			mdt_toggle_keycode(dev_context->mdt_devs.
					   dev_touchscreen, KEY_BACK);
		return 0xFF;
	}
#endif

	/* support dynamic configuration through ATTRIBUTES */
	if (dev_context->mdt_devs.swap_xy != 0) {
		prior_event->abs_x = abs_y;
		prior_event->abs_y = abs_x;
	} else {
		prior_event->abs_x = abs_x;
		prior_event->abs_y = abs_y;
	}

	if ((dev_context->mdt_devs.x_raw != 0) &&
		(dev_context->mdt_devs.x_screen != 0) &&
		(prior_event->abs_x != 0)) {
		prior_event->abs_x *= dev_context->mdt_devs.x_screen;
		prior_event->abs_x /= dev_context->mdt_devs.x_raw;
	}

	if ((dev_context->mdt_devs.y_raw != 0) &&
		(dev_context->mdt_devs.y_screen != 0) &&
		(prior_event->abs_y != 0)) {
		prior_event->abs_y *= dev_context->mdt_devs.y_screen;
		prior_event->abs_y /= dev_context->mdt_devs.y_raw;
	}

	if ((dev_context->mdt_devs.swap_leftright) &&
		(dev_context->mdt_devs.x_max >= prior_event->abs_x))
		prior_event->abs_x =
			(dev_context->mdt_devs.x_max - prior_event->abs_x);

	if ((dev_context->mdt_devs.swap_updown) &&
		(dev_context->mdt_devs.y_max >= prior_event->abs_y))
		prior_event->abs_y =
			(dev_context->mdt_devs.y_max - prior_event->abs_y);

	prior_event->abs_x += dev_context->mdt_devs.x_shift;
	prior_event->abs_y += dev_context->mdt_devs.y_shift;

	if (isTouched == 0) {
		if (prior_event->isTouched == 0)
			/* Multiple release events;
			 * declare contact inactive & ignore
			 */
			prior_event->state = MDT_TOUCH_INACTIVE;
	} else {
		prior_event->state = MDT_TOUCH_ACTIVE;
	}
	prior_event->isTouched = isTouched;

	return contactID;
}

#if defined(SINGLE_TOUCH)
static void submit_touchscreen_events_as_single_touch(
	struct mhl_dev_context *dev_context)
{
	struct input_dev *dev_ts = dev_context->mdt_devs.dev_touchscreen;
	struct mdt_touch_history_t *prior_event;

	prior_event = &(dev_context->mdt_devs.prior_touch_events[0]);
	input_report_key(dev_ts, BTN_TOUCH, prior_event->isTouched);
	input_report_abs(dev_ts, ABS_X, prior_event->abs_x);
	input_report_abs(dev_ts, ABS_Y, prior_event->abs_y);
}
#elif defined(KERNEL_2_6_38_AND_LATER)
static void submit_touchscreen_events_with_proto_B(
	struct mhl_dev_context *dev_context, uint8_t contactID)
{
	struct input_dev *dev_ts = dev_context->mdt_devs.dev_touchscreen;
	struct mdt_touch_history_t *prior_event;
	uint8_t i;
	uint8_t counter = 0;

	for (i = 0; i < MAX_TOUCH_CONTACTS; i++) {

		prior_event = &(dev_context->mdt_devs.prior_touch_events[i]);

		if (prior_event->state == MDT_TOUCH_INACTIVE)
			continue;

		input_mt_slot(dev_ts, i);
		input_mt_report_slot_state(dev_ts, MT_TOOL_FINGER,
					   prior_event->isTouched);

		/* Event already handled; don't handle it again. */
		if (prior_event->isTouched == 0) {
			prior_event->state = MDT_TOUCH_INACTIVE;
		} else {
			counter++;
			input_report_abs(dev_ts, ABS_MT_TOUCH_MAJOR, 15);
			input_report_abs(dev_ts, ABS_MT_PRESSURE, 50);
			input_report_abs(dev_ts, ABS_MT_POSITION_X,
					 prior_event->abs_x);
			input_report_abs(dev_ts, ABS_MT_POSITION_Y,
					 prior_event->abs_y);
		}

		/* BTN_TOUCH breaks support brokend as of JB42 */
#if !defined(JB_421)
		if (counter == 1)
			input_report_key(dev_ts, BTN_TOUCH, 1);
		else
			input_report_key(dev_ts, BTN_TOUCH, 0);
#endif
	}
#else
static void submit_touchscreen_events_with_proto_A(
	struct mhl_dev_context *dev_context, uint8_t contactID)
{
	struct input_dev *dev_ts = dev_context->mdt_devs.dev_touchscreen;
	struct mdt_touch_history_t *prior_event;
	uint8_t i;
	uint8_t count = 0;

	for (i = 0; i < MAX_TOUCH_CONTACTS; i++) {
		prior_event = &(dev_context->mdt_devs.prior_touch_events[i]);

		if (prior_event->state == MDT_TOUCH_INACTIVE)
			continue;

		count++;

		if (prior_event->isTouched == 0)
			/* Event handled; don't handle it again. */
			prior_event->state = MDT_TOUCH_INACTIVE;

		input_report_key(dev_ts, BTN_TOUCH, prior_event->isTouched);
		input_report_abs(dev_ts, ABS_MT_TOUCH_MAJOR,
				 prior_event->isTouched);
		input_report_abs(dev_ts, ABS_MT_TRACKING_ID, i);
		input_report_abs(dev_ts, ABS_MT_WIDTH_MAJOR, 1);
		input_report_abs(dev_ts, ABS_MT_POSITION_X, prior_event->abs_x);
		input_report_abs(dev_ts, ABS_MT_POSITION_Y, prior_event->abs_y);
		input_mt_sync(dev_ts);
	}

	if (count == 0)
		input_mt_sync(dev_ts);
}
#endif

static void generate_event_touchscreen(struct mhl_dev_context *dev_context,
	struct mdt_packet *touchPacket)
{
	struct input_dev *dev_ts = dev_context->mdt_devs.dev_touchscreen;
	uint8_t contactID;

	register_device(dev_context, MDT_TYPE_TOUCHSCREEN);

	if (dev_ts == 0) {
		MHL_TX_DBG_ERR("MDT_ERR_NOTOUCHSCREEN\n");
		return;
	}

	/* process touch packet into prior_touch_events */
	contactID = process_touch_packet(dev_context, touchPacket);
	if (contactID == 0xFF)
		return;

#if defined(SINGLE_TOUCH)
	submit_touchscreen_events_as_single_touch(dev_context);
#elif defined(KERNEL_2_6_38_AND_LATER)
	submit_touchscreen_events_with_proto_B(dev_context, contactID);
#else
	submit_touchscreen_events_with_proto_A(dev_context, contactID);
#endif
	/* generate touchscreen assertion */
	input_sync(dev_ts);
}

static bool process_hotplug_packet(struct mhl_dev_context *dev_context,
	struct mdt_packet *hotplug_packet)
{
	/* 'M' previoulsy found to be in the header byte */
	if ((hotplug_packet->event.hotplug.sub_header_d != D_CHAR) &&
		(hotplug_packet->event.hotplug.sub_header_t != T_CHAR) &&
		(hotplug_packet->event.hotplug.mdt_version != MDT_VERSION))
		return false;

	/* in the future, support response with ACK or NACK */
	MHL_TX_DBG_INFO("HP packet. Device type: %02x. Event: %02x.\n",
			hotplug_packet->event.hotplug.device_type,
			hotplug_packet->event.hotplug.event_code);
	switch (hotplug_packet->event.hotplug.event_code) {
	case NOTICE_DEV_PLUG:
		register_device(dev_context,
				hotplug_packet->event.hotplug.device_type);
		break;
	case NOTICE_DEV_UNPLUG:
		destroy_device(dev_context,
				hotplug_packet->event.hotplug.device_type);
		break;
	default:
		return false;
	}
	return true;
}

bool si_mhl_tx_mdt_process_packet(struct mhl_dev_context *dev_context,
	void *packet)
{
	struct mdt_packet *mdt_event_packet = (struct mdt_packet *)packet;

	if (!(MDT_HDR_IS_HID & mdt_event_packet->header)) {
		if (M_CHAR == mdt_event_packet->header)
			return process_hotplug_packet(dev_context,
				mdt_event_packet);

		MHL_TX_DBG_INFO("Ignoring non-HID packet\n");
		return false;
	}

	if (MDT_HDR_IS_KEYBOARD & mdt_event_packet->header) {
		generate_event_keyboard(dev_context, mdt_event_packet);

	} else if (!(MDT_HDR_IS_KEYBOARD & mdt_event_packet->header) &&
		(!(MDT_HDR_IS_NOT_MOUSE & mdt_event_packet->header))) {
		generate_event_mouse(dev_context, mdt_event_packet);

	} else if (!(MDT_HDR_IS_KEYBOARD & mdt_event_packet->header) &&
		(MDT_HDR_IS_NOT_MOUSE & mdt_event_packet->header)) {
		generate_event_touchscreen(dev_context, mdt_event_packet);

	} else if (!(MDT_HDR_IS_KEYBOARD & mdt_event_packet->header) &&
		(MDT_HDR_IS_NOT_MOUSE & mdt_event_packet->header) &&
		(MDT_HDR_IS_NOT_LAST & mdt_event_packet->header)) {

		MHL_TX_DBG_INFO("Unsupported gaming controller "
				"event received\n");
	} else {
		MHL_TX_DBG_INFO("Event is either not an HID event or "
				"is an an unknown HID event type\n");
		return false;
	}

	/* Consume the write burst event as an MDT event */
	return true;
}

void mdt_destroy(struct mhl_dev_context *dev_context)
{
	destroy_device(dev_context, MDT_TYPE_KEYBOARD);
	destroy_device(dev_context, MDT_TYPE_MOUSE);
	destroy_device(dev_context, MDT_TYPE_TOUCHSCREEN);
}
#endif