path: root/drivers/hid/hid-ntrig.c

/*
 *  HID driver for N-Trig touchscreens
 *
 *  Copyright (c) 2008-2010 Rafi Rubin
 *  Copyright (c) 2009-2010 Stephane Chatty
 *
 */

/*
 * 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; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/usb.h>
#include "usbhid/usbhid.h"
#include <linux/module.h>
#include <linux/slab.h>

#include "hid-ids.h"

#define NTRIG_DUPLICATE_USAGES	0x001

static unsigned int min_width;
module_param(min_width, uint, 0644);
MODULE_PARM_DESC(min_width, "Minimum touch contact width to accept.");

static unsigned int min_height;
module_param(min_height, uint, 0644);
MODULE_PARM_DESC(min_height, "Minimum touch contact height to accept.");

static unsigned int activate_slack = 1;
module_param(activate_slack, uint, 0644);
MODULE_PARM_DESC(activate_slack, "Number of touch frames to ignore at "
		 "the start of touch input.");

static unsigned int deactivate_slack = 4;
module_param(deactivate_slack, uint, 0644);
MODULE_PARM_DESC(deactivate_slack, "Number of empty frames to ignore before "
		 "deactivating touch.");

static unsigned int activation_width = 64;
module_param(activation_width, uint, 0644);
MODULE_PARM_DESC(activation_width, "Width threshold to immediately start "
		 "processing touch events.");

static unsigned int activation_height = 32;
module_param(activation_height, uint, 0644);
MODULE_PARM_DESC(activation_height, "Height threshold to immediately start "
		 "processing touch events.");

struct ntrig_data {
	/* Incoming raw values for a single contact */
	__u16 x, y, w, h;
	__u16 id;

	bool tipswitch;
	bool confidence;
	bool first_contact_touch;

	bool reading_mt;

	__u8 mt_footer[4];
	__u8 mt_foot_count;

	/* The current activation state. */
	__s8 act_state;

	/* Empty frames to ignore before recognizing the end of activity */
	__s8 deactivate_slack;

	/* Frames to ignore before acknowledging the start of activity */
	__s8 activate_slack;

	/* Minimum size contact to accept */
	__u16 min_width;
	__u16 min_height;

	/* Threshold to override activation slack */
	__u16 activation_width;
	__u16 activation_height;

	__u16 sensor_logical_width;
	__u16 sensor_logical_height;
	__u16 sensor_physical_width;
	__u16 sensor_physical_height;
};


static ssize_t show_phys_width(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct ntrig_data *nd = hid_get_drvdata(hdev);

	return sprintf(buf, "%d\n", nd->sensor_physical_width);
}

static DEVICE_ATTR(sensor_physical_width, S_IRUGO, show_phys_width, NULL);

static ssize_t show_phys_height(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct ntrig_data *nd = hid_get_drvdata(hdev);

	return sprintf(buf, "%d\n", nd->sensor_physical_height);
}

static DEVICE_ATTR(sensor_physical_height, S_IRUGO, show_phys_height, NULL);

static ssize_t show_log_width(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct ntrig_data *nd = hid_get_drvdata(hdev);

	return sprintf(buf, "%d\n", nd->sensor_logical_width);
}

static DEVICE_ATTR(sensor_logical_width, S_IRUGO, show_log_width, NULL);

static ssize_t show_log_height(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct ntrig_data *nd = hid_get_drvdata(hdev);

	return sprintf(buf, "%d\n", nd->sensor_logical_height);
}

static DEVICE_ATTR(sensor_logical_height, S_IRUGO, show_log_height, NULL);

static ssize_t show_min_width(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct ntrig_data *nd = hid_get_drvdata(hdev);

	return sprintf(buf, "%d\n", nd->min_width *
				    nd->sensor_physical_width /
				    nd->sensor_logical_width);
}

static ssize_t set_min_width(struct device *dev,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct ntrig_data *nd = hid_get_drvdata(hdev);

	unsigned long<