drivers/hid/hid-ntrig.c - kernel/prism - Git at Google

 /*
  *  HID driver for N-Trig touchscreens
  *
  *  Copyright (c) 2008 Rafi Rubin
  *  Copyright (c) 2009 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/module.h>

 #include "hid-ids.h"

 #define NTRIG_DUPLICATE_USAGES	0x001

 #define nt_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
 					EV_KEY, (c))

 struct ntrig_data {
 	__s32 x, y, id, w, h;
 	char reading_a_point, found_contact_id;
 	char pen_active;
 	char finger_active;
 	char inverted;
 };

 /*
  * this driver is aimed at two firmware versions in circulation:
  *  - dual pen/finger single touch
  *  - finger multitouch, pen not working
  */

 static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 		struct hid_field *field, struct hid_usage *usage,
 		unsigned long **bit, int *max)
 {
 	switch (usage->hid & HID_USAGE_PAGE) {

 	case HID_UP_GENDESK:
 		switch (usage->hid) {
 		case HID_GD_X:
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_POSITION_X);
 			input_set_abs_params(hi->input, ABS_X,
 					field->logical_minimum,
 					field->logical_maximum, 0, 0);
 			return 1;
 		case HID_GD_Y:
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_POSITION_Y);
 			input_set_abs_params(hi->input, ABS_Y,
 					field->logical_minimum,
 					field->logical_maximum, 0, 0);
 			return 1;
 		}
 		return 0;

 	case HID_UP_DIGITIZER:
 		switch (usage->hid) {
 		/* we do not want to map these for now */
 		case HID_DG_CONTACTID: /* value is useless */
 		case HID_DG_INPUTMODE:
 		case HID_DG_DEVICEINDEX:
 		case HID_DG_CONTACTCOUNT:
 		case HID_DG_CONTACTMAX:
 			return -1;

 		/* original mapping by Rafi Rubin */
 		case HID_DG_CONFIDENCE:
 			nt_map_key_clear(BTN_TOOL_DOUBLETAP);
 			return 1;

 		/* width/height mapped on TouchMajor/TouchMinor/Orientation */
 		case HID_DG_WIDTH:
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_TOUCH_MAJOR);
 			return 1;
 		case HID_DG_HEIGHT:
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_TOUCH_MINOR);
 			input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
 					0, 1, 0, 0);
 			return 1;
 		}
 		return 0;

 	case 0xff000000:
 		/* we do not want to map these: no input-oriented meaning */
 		return -1;
 	}

 	return 0;
 }

 static int ntrig_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 		struct hid_field *field, struct hid_usage *usage,
 		unsigned long **bit, int *max)
 {
 	if (usage->type == EV_KEY || usage->type == EV_REL
 			|| usage->type == EV_ABS)
 		clear_bit(usage->code, *bit);

 	return 0;
 }

 /*
  * this function is called upon all reports
  * so that we can filter contact point information,
  * decide whether we are in multi or single touch mode
  * and call input_mt_sync after each point if necessary
  */
 static int ntrig_event (struct hid_device *hid, struct hid_field *field,
 		                        struct hid_usage *usage, __s32 value)
 {
 	struct input_dev *input = field->hidinput->input;
 	struct ntrig_data *nd = hid_get_drvdata(hid);

         if (hid->claimed & HID_CLAIMED_INPUT) {
 		switch (usage->hid) {

 		case HID_DG_INRANGE:
 			if (field->application & 0x3)
 				nd->pen_active = (value != 0);
 			else
 				nd->finger_active = (value != 0);
 			return 0;

 		case HID_DG_INVERT:
 			nd->inverted = value;
 			return 0;

 		case HID_GD_X:
 			nd->x = value;
 			nd->reading_a_point = 1;
 			break;
 		case HID_GD_Y:
 			nd->y = value;
 			break;
 		case HID_DG_CONTACTID:
 			nd->id = value;
 			/* we receive this only when in multitouch mode */
 			nd->found_contact_id = 1;
 			break;
 		case HID_DG_WIDTH:
 			nd->w = value;
 			break;
 		case HID_DG_HEIGHT:
 			nd->h = value;
 			/*
 			 * when in single touch mode, this is the last
 			 * report received in a finger event. We want
 			 * to emit a normal (X, Y) position
 			 */
 			if (!nd->found_contact_id) {
 				if (nd->pen_active && nd->finger_active) {
 					input_report_key(input, BTN_TOOL_DOUBLETAP, 0);
 					input_report_key(input, BTN_TOOL_DOUBLETAP, 1);
 				}
 				input_event(input, EV_ABS, ABS_X, nd->x);
 				input_event(input, EV_ABS, ABS_Y, nd->y);
 			}
 			break;
 		case HID_DG_TIPPRESSURE:
 			/*
 			 * when in single touch mode, this is the last
 			 * report received in a pen event. We want
 			 * to emit a normal (X, Y) position
 			 */
 			if (! nd->found_contact_id) {
 				if (nd->pen_active && nd->finger_active) {
 					input_report_key(input,
 							nd->inverted ? BTN_TOOL_RUBBER : BTN_TOOL_PEN
 							, 0);
 					input_report_key(input,
 							nd->inverted ? BTN_TOOL_RUBBER : BTN_TOOL_PEN
 							, 1);
 				}
 				input_event(input, EV_ABS, ABS_X, nd->x);
 				input_event(input, EV_ABS, ABS_Y, nd->y);
 				input_event(input, EV_ABS, ABS_PRESSURE, value);
 			}
 			break;
 		case 0xff000002:
 			/*
 			 * we receive this when the device is in multitouch
 			 * mode. The first of the three values tagged with
 			 * this usage tells if the contact point is real
 			 * or a placeholder
 			 */
 			if (!nd->reading_a_point || value != 1)
 				break;
 			/* emit a normal (X, Y) for the first point only */
 			if (nd->id == 0) {
 				input_event(input, EV_ABS, ABS_X, nd->x);
 				input_event(input, EV_ABS, ABS_Y, nd->y);
 			}
 			input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
 			input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
 			if (nd->w > nd->h) {
 				input_event(input, EV_ABS,
 						ABS_MT_ORIENTATION, 1);
 				input_event(input, EV_ABS,
 						ABS_MT_TOUCH_MAJOR, nd->w);
 				input_event(input, EV_ABS,
 						ABS_MT_TOUCH_MINOR, nd->h);
 			} else {
 				input_event(input, EV_ABS,
 						ABS_MT_ORIENTATION, 0);
 				input_event(input, EV_ABS,
 						ABS_MT_TOUCH_MAJOR, nd->h);
 				input_event(input, EV_ABS,
 						ABS_MT_TOUCH_MINOR, nd->w);
 			}
 			input_mt_sync(field->hidinput->input);
 			nd->reading_a_point = 0;
 			nd->found_contact_id = 0;
 			break;

 		default:
 			/* fallback to the generic hidinput handling */
 			return 0;
 		}
 	}

 	/* we have handled the hidinput part, now remains hiddev */
         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
                 hid->hiddev_hid_event(hid, field, usage, value);

 	return 1;
 }

 static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int ret;
 	struct ntrig_data *nd;

 	nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
 	if (!nd) {
 		dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
 		return -ENOMEM;
 	}
 	nd->reading_a_point = 0;
 	nd->found_contact_id = 0;
 	hid_set_drvdata(hdev, nd);

 	ret = hid_parse(hdev);
 	if (!ret)
 		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

 	if (ret)
 		kfree (nd);

 	return ret;
 }

 static void ntrig_remove(struct hid_device *hdev)
 {
 	hid_hw_stop(hdev);
 	kfree(hid_get_drvdata(hdev));
 }

 static const struct hid_device_id ntrig_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
 		.driver_data = NTRIG_DUPLICATE_USAGES },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, ntrig_devices);

 static const struct hid_usage_id ntrig_grabbed_usages[] = {
 	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
 	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
 };

 static struct hid_driver ntrig_driver = {
 	.name = "ntrig",
 	.id_table = ntrig_devices,
 	.probe = ntrig_probe,
 	.remove = ntrig_remove,
 	.input_mapping = ntrig_input_mapping,
 	.input_mapped = ntrig_input_mapped,
 	.usage_table = ntrig_grabbed_usages,
 	.event = ntrig_event,
 };

 static int __init ntrig_init(void)
 {
 	return hid_register_driver(&ntrig_driver);
 }

 static void __exit ntrig_exit(void)
 {
 	hid_unregister_driver(&ntrig_driver);
 }

 module_init(ntrig_init);
 module_exit(ntrig_exit);
 MODULE_LICENSE("GPL");
	/*
	* HID driver for N-Trig touchscreens
	*
	* Copyright (c) 2008 Rafi Rubin
	* Copyright (c) 2009 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/module.h>

	#include "hid-ids.h"

	#define NTRIG_DUPLICATE_USAGES 0x001

	#define nt_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
	EV_KEY, (c))

	struct ntrig_data {
	__s32 x, y, id, w, h;
	char reading_a_point, found_contact_id;
	char pen_active;
	char finger_active;
	char inverted;
	};

	/*
	* this driver is aimed at two firmware versions in circulation:
	* - dual pen/finger single touch
	* - finger multitouch, pen not working
	*/

	static int ntrig_input_mapping(struct hid_device hdev, struct hid_input hi,
	struct hid_field field, struct hid_usage usage,
	unsigned long *bit, int max)
	{
	switch (usage->hid & HID_USAGE_PAGE) {

	case HID_UP_GENDESK:
	switch (usage->hid) {
	case HID_GD_X:
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_POSITION_X);
	input_set_abs_params(hi->input, ABS_X,
	field->logical_minimum,
	field->logical_maximum, 0, 0);
	return 1;
	case HID_GD_Y:
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_POSITION_Y);
	input_set_abs_params(hi->input, ABS_Y,
	field->logical_minimum,
	field->logical_maximum, 0, 0);
	return 1;
	}
	return 0;

	case HID_UP_DIGITIZER:
	switch (usage->hid) {
	/* we do not want to map these for now */
	case HID_DG_CONTACTID: /* value is useless */
	case HID_DG_INPUTMODE:
	case HID_DG_DEVICEINDEX:
	case HID_DG_CONTACTCOUNT:
	case HID_DG_CONTACTMAX:
	return -1;

	/* original mapping by Rafi Rubin */
	case HID_DG_CONFIDENCE:
	nt_map_key_clear(BTN_TOOL_DOUBLETAP);
	return 1;

	/* width/height mapped on TouchMajor/TouchMinor/Orientation */
	case HID_DG_WIDTH:
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_TOUCH_MAJOR);
	return 1;
	case HID_DG_HEIGHT:
	hid_map_usage(hi, usage, bit, max,
	EV_ABS, ABS_MT_TOUCH_MINOR);
	input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
	0, 1, 0, 0);
	return 1;
	}
	return 0;

	case 0xff000000:
	/* we do not want to map these: no input-oriented meaning */
	return -1;
	}

	return 0;
	}

	static int ntrig_input_mapped(struct hid_device hdev, struct hid_input hi,
	struct hid_field field, struct hid_usage usage,
	unsigned long *bit, int max)
	{
	if (usage->type == EV_KEY \|\| usage->type == EV_REL
	\|\| usage->type == EV_ABS)
	clear_bit(usage->code, *bit);

	return 0;
	}

	/*
	* this function is called upon all reports
	* so that we can filter contact point information,
	* decide whether we are in multi or single touch mode
	* and call input_mt_sync after each point if necessary
	*/
	static int ntrig_event (struct hid_device hid, struct hid_field field,
	struct hid_usage *usage, __s32 value)
	{
	struct input_dev *input = field->hidinput->input;
	struct ntrig_data *nd = hid_get_drvdata(hid);

	if (hid->claimed & HID_CLAIMED_INPUT) {
	switch (usage->hid) {

	case HID_DG_INRANGE:
	if (field->application & 0x3)
	nd->pen_active = (value != 0);
	else
	nd->finger_active = (value != 0);
	return 0;

	case HID_DG_INVERT:
	nd->inverted = value;
	return 0;

	case HID_GD_X:
	nd->x = value;
	nd->reading_a_point = 1;
	break;
	case HID_GD_Y:
	nd->y = value;
	break;
	case HID_DG_CONTACTID:
	nd->id = value;
	/* we receive this only when in multitouch mode */
	nd->found_contact_id = 1;
	break;
	case HID_DG_WIDTH:
	nd->w = value;
	break;
	case HID_DG_HEIGHT:
	nd->h = value;
	/*
	* when in single touch mode, this is the last
	* report received in a finger event. We want
	* to emit a normal (X, Y) position
	*/
	if (!nd->found_contact_id) {
	if (nd->pen_active && nd->finger_active) {
	input_report_key(input, BTN_TOOL_DOUBLETAP, 0);
	input_report_key(input, BTN_TOOL_DOUBLETAP, 1);
	}
	input_event(input, EV_ABS, ABS_X, nd->x);
	input_event(input, EV_ABS, ABS_Y, nd->y);
	}
	break;
	case HID_DG_TIPPRESSURE:
	/*
	* when in single touch mode, this is the last
	* report received in a pen event. We want
	* to emit a normal (X, Y) position
	*/
	if (! nd->found_contact_id) {
	if (nd->pen_active && nd->finger_active) {
	input_report_key(input,
	nd->inverted ? BTN_TOOL_RUBBER : BTN_TOOL_PEN
	, 0);
	input_report_key(input,
	nd->inverted ? BTN_TOOL_RUBBER : BTN_TOOL_PEN
	, 1);
	}
	input_event(input, EV_ABS, ABS_X, nd->x);
	input_event(input, EV_ABS, ABS_Y, nd->y);
	input_event(input, EV_ABS, ABS_PRESSURE, value);
	}
	break;
	case 0xff000002:
	/*
	* we receive this when the device is in multitouch
	* mode. The first of the three values tagged with
	* this usage tells if the contact point is real
	* or a placeholder
	*/
	if (!nd->reading_a_point \|\| value != 1)
	break;
	/* emit a normal (X, Y) for the first point only */
	if (nd->id == 0) {
	input_event(input, EV_ABS, ABS_X, nd->x);
	input_event(input, EV_ABS, ABS_Y, nd->y);
	}
	input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
	input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
	if (nd->w > nd->h) {
	input_event(input, EV_ABS,
	ABS_MT_ORIENTATION, 1);
	input_event(input, EV_ABS,
	ABS_MT_TOUCH_MAJOR, nd->w);
	input_event(input, EV_ABS,
	ABS_MT_TOUCH_MINOR, nd->h);
	} else {
	input_event(input, EV_ABS,
	ABS_MT_ORIENTATION, 0);
	input_event(input, EV_ABS,
	ABS_MT_TOUCH_MAJOR, nd->h);
	input_event(input, EV_ABS,
	ABS_MT_TOUCH_MINOR, nd->w);
	}
	input_mt_sync(field->hidinput->input);
	nd->reading_a_point = 0;
	nd->found_contact_id = 0;
	break;

	default:
	/* fallback to the generic hidinput handling */
	return 0;
	}
	}

	/* we have handled the hidinput part, now remains hiddev */
	if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
	hid->hiddev_hid_event(hid, field, usage, value);

	return 1;
	}

	static int ntrig_probe(struct hid_device hdev, const struct hid_device_id id)
	{
	int ret;
	struct ntrig_data *nd;

	nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
	if (!nd) {
	dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
	return -ENOMEM;
	}
	nd->reading_a_point = 0;
	nd->found_contact_id = 0;
	hid_set_drvdata(hdev, nd);

	ret = hid_parse(hdev);
	if (!ret)
	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

	if (ret)
	kfree (nd);

	return ret;
	}

	static void ntrig_remove(struct hid_device *hdev)
	{
	hid_hw_stop(hdev);
	kfree(hid_get_drvdata(hdev));
	}

	static const struct hid_device_id ntrig_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
	.driver_data = NTRIG_DUPLICATE_USAGES },
	{ }
	};
	MODULE_DEVICE_TABLE(hid, ntrig_devices);

	static const struct hid_usage_id ntrig_grabbed_usages[] = {
	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
	};

	static struct hid_driver ntrig_driver = {
	.name = "ntrig",
	.id_table = ntrig_devices,
	.probe = ntrig_probe,
	.remove = ntrig_remove,
	.input_mapping = ntrig_input_mapping,
	.input_mapped = ntrig_input_mapped,
	.usage_table = ntrig_grabbed_usages,
	.event = ntrig_event,
	};

	static int __init ntrig_init(void)
	{
	return hid_register_driver(&ntrig_driver);
	}

	static void __exit ntrig_exit(void)
	{
	hid_unregister_driver(&ntrig_driver);
	}

	module_init(ntrig_init);
	module_exit(ntrig_exit);
	MODULE_LICENSE("GPL");