text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (c) 2011-2016 Synaptics Incorporated
   * Copyright (c) 2011 Unixphere
   */
  
  #include <linux/kernel.h>
  #include <linux/device.h>
  #include <linux/of.h>
  #include <linux/input.h>
  #include <linux/input/mt.h>
  #include <linux/rmi.h>
  #include "rmi_driver.h"
  #include "rmi_2d_sensor.h"
  
  #define RMI_2D_REL_POS_MIN		-128
  #define RMI_2D_REL_POS_MAX		127
  
  /* maximum ABS_MT_POSITION displacement (in mm) */
  #define DMAX 10
  
  void rmi_2d_sensor_abs_process(struct rmi_2d_sensor *sensor,
  				struct rmi_2d_sensor_abs_object *obj,
  				int slot)
  {
  	struct rmi_2d_axis_alignment *axis_align = &sensor->axis_align;
  
  	/* we keep the previous values if the finger is released */
  	if (obj->type == RMI_2D_OBJECT_NONE)
  		return;
  
  	if (axis_align->flip_x)
  		obj->x = sensor->max_x - obj->x;
  
  	if (axis_align->flip_y)
  		obj->y = sensor->max_y - obj->y;
  
  	if (axis_align->swap_axes)
  		swap(obj->x, obj->y);
  
  	/*
  	 * Here checking if X offset or y offset are specified is
  	 * redundant. We just add the offsets or clip the values.
  	 *
  	 * Note: offsets need to be applied before clipping occurs,
  	 * or we could get funny values that are outside of
  	 * clipping boundaries.
  	 */
  	obj->x += axis_align->offset_x;
  	obj->y += axis_align->offset_y;
  
  	obj->x =  max(axis_align->clip_x_low, obj->x);
  	obj->y =  max(axis_align->clip_y_low, obj->y);
  
  	if (axis_align->clip_x_high)
  		obj->x = min(sensor->max_x, obj->x);
  
  	if (axis_align->clip_y_high)
  		obj->y =  min(sensor->max_y, obj->y);
  
  	sensor->tracking_pos[slot].x = obj->x;
  	sensor->tracking_pos[slot].y = obj->y;
  }
  EXPORT_SYMBOL_GPL(rmi_2d_sensor_abs_process);
  
  void rmi_2d_sensor_abs_report(struct rmi_2d_sensor *sensor,
  				struct rmi_2d_sensor_abs_object *obj,
  				int slot)
  {
  	struct rmi_2d_axis_alignment *axis_align = &sensor->axis_align;
  	struct input_dev *input = sensor->input;
  	int wide, major, minor;
  
  	if (sensor->kernel_tracking)
  		input_mt_slot(input, sensor->tracking_slots[slot]);
  	else
  		input_mt_slot(input, slot);
  
  	input_mt_report_slot_state(input, obj->mt_tool,
  				   obj->type != RMI_2D_OBJECT_NONE);
  
  	if (obj->type != RMI_2D_OBJECT_NONE) {
  		obj->x = sensor->tracking_pos[slot].x;
  		obj->y = sensor->tracking_pos[slot].y;
  
  		if (axis_align->swap_axes)
  			swap(obj->wx, obj->wy);
  
  		wide = (obj->wx > obj->wy);
  		major = max(obj->wx, obj->wy);
  		minor = min(obj->wx, obj->wy);
  
  		if (obj->type == RMI_2D_OBJECT_STYLUS) {
  			major = max(1, major);
  			minor = max(1, minor);
  		}
  
  		input_event(sensor->input, EV_ABS, ABS_MT_POSITION_X, obj->x);
  		input_event(sensor->input, EV_ABS, ABS_MT_POSITION_Y, obj->y);
  		input_event(sensor->input, EV_ABS, ABS_MT_ORIENTATION, wide);
  		input_event(sensor->input, EV_ABS, ABS_MT_PRESSURE, obj->z);
  		input_event(sensor->input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
  		input_event(sensor->input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
  
  		rmi_dbg(RMI_DEBUG_2D_SENSOR, &sensor->input->dev,
  			"%s: obj[%d]: type: 0x%02x X: %d Y: %d Z: %d WX: %d WY: %d\n",
  			__func__, slot, obj->type, obj->x, obj->y, obj->z,
  			obj->wx, obj->wy);
  	}
  }
  EXPORT_SYMBOL_GPL(rmi_2d_sensor_abs_report);
  
  void rmi_2d_sensor_rel_report(struct rmi_2d_sensor *sensor, int x, int y)
  {
  	struct rmi_2d_axis_alignment *axis_align = &sensor->axis_align;
  
  	x = min(RMI_2D_REL_POS_MAX, max(RMI_2D_REL_POS_MIN, (int)x));
  	y = min(RMI_2D_REL_POS_MAX, max(RMI_2D_REL_POS_MIN, (int)y));
  
  	if (axis_align->flip_x)
  		x = min(RMI_2D_REL_POS_MAX, -x);
  
  	if (axis_align->flip_y)
  		y = min(RMI_2D_REL_POS_MAX, -y);
  
  	if (axis_align->swap_axes)
  		swap(x, y);
  
  	if (x || y) {
  		input_report_rel(sensor->input, REL_X, x);
  		input_report_rel(sensor->input, REL_Y, y);
  	}
  }
  EXPORT_SYMBOL_GPL(rmi_2d_sensor_rel_report);
  
  static void rmi_2d_sensor_set_input_params(struct rmi_2d_sensor *sensor)
  {
  	struct input_dev *input = sensor->input;
  	int res_x;
  	int res_y;
  	int max_x, max_y;
  	int input_flags = 0;
  
  	if (sensor->report_abs) {
  		sensor->min_x = sensor->axis_align.clip_x_low;
  		if (sensor->axis_align.clip_x_high)
  			sensor->max_x = min(sensor->max_x,
  				sensor->axis_align.clip_x_high);
  
  		sensor->min_y = sensor->axis_align.clip_y_low;
  		if (sensor->axis_align.clip_y_high)
  			sensor->max_y = min(sensor->max_y,
  				sensor->axis_align.clip_y_high);
  
  		set_bit(EV_ABS, input->evbit);
  
  		max_x = sensor->max_x;
  		max_y = sensor->max_y;
  		if (sensor->axis_align.swap_axes)
  			swap(max_x, max_y);
  		input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
  		input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
  
  		if (sensor->x_mm && sensor->y_mm) {
  			res_x = (sensor->max_x - sensor->min_x) / sensor->x_mm;
  			res_y = (sensor->max_y - sensor->min_y) / sensor->y_mm;
  			if (sensor->axis_align.swap_axes)
  				swap(res_x, res_y);
  
  			input_abs_set_res(input, ABS_X, res_x);
  			input_abs_set_res(input, ABS_Y, res_y);
  
  			input_abs_set_res(input, ABS_MT_POSITION_X, res_x);
  			input_abs_set_res(input, ABS_MT_POSITION_Y, res_y);
  
  			if (!sensor->dmax)
  				sensor->dmax = DMAX * res_x;
  		}
  
  		input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xff, 0, 0);
  		input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 0x0f, 0, 0);
  		input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 0x0f, 0, 0);
  		input_set_abs_params(input, ABS_MT_ORIENTATION, 0, 1, 0, 0);
  		input_set_abs_params(input, ABS_MT_TOOL_TYPE,
  				     0, MT_TOOL_MAX, 0, 0);
  
  		if (sensor->sensor_type == rmi_sensor_touchpad)
  			input_flags = INPUT_MT_POINTER;
  		else
  			input_flags = INPUT_MT_DIRECT;
  
  		if (sensor->kernel_tracking)
  			input_flags |= INPUT_MT_TRACK;
  
  		input_mt_init_slots(input, sensor->nbr_fingers, input_flags);
  	}
  
  	if (sensor->report_rel) {
  		set_bit(EV_REL, input->evbit);
  		set_bit(REL_X, input->relbit);
  		set_bit(REL_Y, input->relbit);
  	}
  
  	if (sensor->topbuttonpad)
  		set_bit(INPUT_PROP_TOPBUTTONPAD, input->propbit);
  }
  
  int rmi_2d_sensor_configure_input(struct rmi_function *fn,
  					struct rmi_2d_sensor *sensor)
  {
  	struct rmi_device *rmi_dev = fn->rmi_dev;
  	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
  
  	if (!drv_data->input)
  		return -ENODEV;
  
  	sensor->input = drv_data->input;
  	rmi_2d_sensor_set_input_params(sensor);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(rmi_2d_sensor_configure_input);
  
  #ifdef CONFIG_OF
  int rmi_2d_sensor_of_probe(struct device *dev,
  			struct rmi_2d_sensor_platform_data *pdata)
  {
  	int retval;
  	u32 val;
  
  	pdata->axis_align.swap_axes = of_property_read_bool(dev->of_node,
  						"touchscreen-swapped-x-y");
  
  	pdata->axis_align.flip_x = of_property_read_bool(dev->of_node,
  						"touchscreen-inverted-x");
  
  	pdata->axis_align.flip_y = of_property_read_bool(dev->of_node,
  						"touchscreen-inverted-y");
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,clip-x-low", 1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.clip_x_low = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,clip-y-low",	1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.clip_y_low = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,clip-x-high", 1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.clip_x_high = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,clip-y-high", 1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.clip_y_high = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,offset-x", 1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.offset_x = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,offset-y", 1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.offset_y = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,delta-x-threshold",
  						1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.delta_x_threshold = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,delta-y-threshold",
  						1);
  	if (retval)
  		return retval;
  
  	pdata->axis_align.delta_y_threshold = val;
  
  	retval = rmi_of_property_read_u32(dev, (u32 *)&pdata->sensor_type,
  			"syna,sensor-type", 1);
  	if (retval)
  		return retval;
  
  	retval = rmi_of_property_read_u32(dev, &val, "touchscreen-x-mm", 1);
  	if (retval)
  		return retval;
  
  	pdata->x_mm = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "touchscreen-y-mm", 1);
  	if (retval)
  		return retval;
  
  	pdata->y_mm = val;
  
  	retval = rmi_of_property_read_u32(dev, &val,
  				"syna,disable-report-mask", 1);
  	if (retval)
  		return retval;
  
  	pdata->disable_report_mask = val;
  
  	retval = rmi_of_property_read_u32(dev, &val, "syna,rezero-wait-ms",
  						1);
  	if (retval)
  		return retval;
  
  	pdata->rezero_wait = val;
  
  	return 0;
  }
  #else
  inline int rmi_2d_sensor_of_probe(struct device *dev,
  			struct rmi_2d_sensor_platform_data *pdata)
  {
  	return -ENODEV;
  }
  #endif
  EXPORT_SYMBOL_GPL(rmi_2d_sensor_of_probe);
  