[linux-2.6-block.git] / 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

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;
};

/*
 * 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)
{
	/* No special mappings needed for the pen and single touch */
	if (field->physical)
		return 0;

	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: /* Not trustworthy, squelch for now */
		case HID_DG_INPUTMODE:
		case HID_DG_DEVICEINDEX:
		case HID_DG_CONTACTMAX:
			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)
{
	/* No special mappings needed for the pen and single touch */
	if (field->physical)
		return 0;

	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);

	/* No special handling needed for the pen */
	if (field->application == HID_DG_PEN)
		return 0;

        if (hid->claimed & HID_CLAIMED_INPUT) {
		switch (usage->hid) {
		case 0xff000001:
			/* Tag indicating the start of a multitouch group */
			nd->reading_mt = 1;
			nd->first_contact_touch = 0;
			break;
		case HID_DG_TIPSWITCH:
			nd->tipswitch = value;
			/* Prevent emission of touch until validated */
			return 1;
		case HID_DG_CONFIDENCE:
			nd->confidence = value;
			break;
		case HID_GD_X:
			nd->x = value;
			/* Clear the contact footer */
			nd->mt_foot_count = 0;
			break;
		case HID_GD_Y:
			nd->y = value;
			break;
		case HID_DG_CONTACTID:
			nd->id = value;
			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->reading_mt) {
				/*
				 * TipSwitch indicates the presence of a
				 * finger in single touch mode.
				 */
				input_report_key(input, BTN_TOUCH,
						 nd->tipswitch);
				input_report_key(input, BTN_TOOL_DOUBLETAP,
						 nd->tipswitch);
				input_event(input, EV_ABS, ABS_X, nd->x);
				input_event(input, EV_ABS, ABS_Y, nd->y);
			}
			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
			 */

			/* Shouldn't get more than 4 footer packets, so skip */
			if (nd->mt_foot_count >= 4)
				break;

			nd->mt_footer[nd->mt_foot_count++] = value;

			/* if the footer isn't complete break */
			if (nd->mt_foot_count != 4)
				break;

			/* Pen activity signal, trigger end of touch. */
			if (nd->mt_footer[2]) {
				nd->confidence = 0;
				break;
			}

			/* If the contact was invalid */
			if (!(nd->confidence && nd->mt_footer[0])
					|| nd->w <= 250
					|| nd->h <= 190) {
				nd->confidence = 0;
				break;
			}

			/* emit a normal (X, Y) for the first point only */
			if (nd->id == 0) {
				/*
				 * TipSwitch is superfluous in multitouch
				 * mode.  The footer events tell us
				 * if there is a finger on the screen or
				 * not.
				 */
				nd->first_contact_touch = nd->confidence;
				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);
			break;

		case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
			if (!nd->reading_mt)
				break;

			nd->reading_mt = 0;

			if (nd->first_contact_touch) {
				input_report_key(input, BTN_TOOL_DOUBLETAP, 1);
				input_report_key(input, BTN_TOUCH, 1);
			} else {
				input_report_key(input, BTN_TOOL_DOUBLETAP, 0);
				input_report_key(input, BTN_TOUCH, 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;
	struct hid_input *hidinput;
	struct input_dev *input;
	struct hid_report *report;

	if (id->driver_data)
		hdev->quirks |= HID_QUIRK_MULTI_INPUT;

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

	nd->reading_mt = 0;
	hid_set_drvdata(hdev, nd);

	ret = hid_parse(hdev);
	if (ret) {
		dev_err(&hdev->dev, "parse failed\n");
		goto err_free;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
	if (ret) {
		dev_err(&hdev->dev, "hw start failed\n");
		goto err_free;
	}


	list_for_each_entry(hidinput, &hdev->inputs, list) {
		if (hidinput->report->maxfield < 1)
			continue;

		input = hidinput->input;
		switch (hidinput->report->field[0]->application) {
		case HID_DG_PEN:
			input->name = "N-Trig Pen";
			break;
		case HID_DG_TOUCHSCREEN:
			/* These keys are redundant for fingers, clear them
			 * to prevent incorrect identification */
			__clear_bit(BTN_TOOL_PEN, input->keybit);
			__clear_bit(BTN_TOOL_FINGER, input->keybit);
			__clear_bit(BTN_0, input->keybit);
			__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
			/*
			 * The physical touchscreen (single touch)
			 * input has a value for physical, whereas
			 * the multitouch only has logical input
			 * fields.
			 */
			input->name =
				(hidinput->report->field[0]
				 ->physical) ?
				"N-Trig Touchscreen" :
				"N-Trig MultiTouch";
			break;
		}
	}

	/* This is needed for devices with more recent firmware versions */
	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0x0a];
	if (report)
		usbhid_submit_report(hdev, report, USB_DIR_OUT);


	return 0;
err_free:
	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");
Commit	Line	Data
94011f93	1	/*
57fd637a	2	* HID driver for N-Trig touchscreens
94011f93	3	*
6549981b SC	4	* Copyright (c) 2008-2010 Rafi Rubin
6549981b SC	5	* Copyright (c) 2009-2010 Stephane Chatty
94011f93 RR	6	*
	7	*/
	8
	9	/*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the Free
	12	* Software Foundation; either version 2 of the License, or (at your option)
	13	* any later version.
	14	*/
	15
	16	#include <linux/device.h>
	17	#include <linux/hid.h>
6549981b SC	18	#include <linux/usb.h>
6549981b SC	19	#include "usbhid/usbhid.h"
94011f93	20	#include <linux/module.h>
5a0e3ad6	21	#include <linux/slab.h>
94011f93 RR	22
	23	#include "hid-ids.h"
	24
	25	#define NTRIG_DUPLICATE_USAGES 0x001
	26
57fd637a	27	struct ntrig_data {
dbf2b17d RR	28	/* Incoming raw values for a single contact */
	29	__u16 x, y, w, h;
	30	__u16 id;
250d3775 RR	31
	32	bool tipswitch;
	33	bool confidence;
	34	bool first_contact_touch;
dbf2b17d RR	35
dbf2b17d RR	36	bool reading_mt;
dbf2b17d RR	37
	38	__u8 mt_footer[4];
	39	__u8 mt_foot_count;
57fd637a SC	40	};
	41
	42	/*
	43	* this driver is aimed at two firmware versions in circulation:
	44	* - dual pen/finger single touch
	45	* - finger multitouch, pen not working
	46	*/
	47
94011f93 RR	48	static int ntrig_input_mapping(struct hid_device hdev, struct hid_input hi,
	49	struct hid_field field, struct hid_usage usage,
	50	unsigned long *bit, int max)
	51	{
dbf2b17d RR	52	/* No special mappings needed for the pen and single touch */
dbf2b17d RR	53	if (field->physical)
943ed464 RR	54	return 0;
943ed464 RR	55
57fd637a	56	switch (usage->hid & HID_USAGE_PAGE) {
57fd637a SC	57	case HID_UP_GENDESK:
	58	switch (usage->hid) {
	59	case HID_GD_X:
	60	hid_map_usage(hi, usage, bit, max,
	61	EV_ABS, ABS_MT_POSITION_X);
	62	input_set_abs_params(hi->input, ABS_X,
	63	field->logical_minimum,
	64	field->logical_maximum, 0, 0);
	65	return 1;
	66	case HID_GD_Y:
	67	hid_map_usage(hi, usage, bit, max,
	68	EV_ABS, ABS_MT_POSITION_Y);
	69	input_set_abs_params(hi->input, ABS_Y,
	70	field->logical_minimum,
	71	field->logical_maximum, 0, 0);
	72	return 1;
	73	}
	74	return 0;
	75
	76	case HID_UP_DIGITIZER:
	77	switch (usage->hid) {
	78	/* we do not want to map these for now */
dbf2b17d	79	case HID_DG_CONTACTID: /* Not trustworthy, squelch for now */
57fd637a SC	80	case HID_DG_INPUTMODE:
57fd637a SC	81	case HID_DG_DEVICEINDEX:
57fd637a SC	82	case HID_DG_CONTACTMAX:
	83	return -1;
	84
57fd637a SC	85	/* width/height mapped on TouchMajor/TouchMinor/Orientation */
	86	case HID_DG_WIDTH:
	87	hid_map_usage(hi, usage, bit, max,
	88	EV_ABS, ABS_MT_TOUCH_MAJOR);
	89	return 1;
	90	case HID_DG_HEIGHT:
	91	hid_map_usage(hi, usage, bit, max,
	92	EV_ABS, ABS_MT_TOUCH_MINOR);
	93	input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
	94	0, 1, 0, 0);
	95	return 1;
	96	}
	97	return 0;
	98
	99	case 0xff000000:
	100	/* we do not want to map these: no input-oriented meaning */
	101	return -1;
94011f93	102	}
57fd637a	103
94011f93 RR	104	return 0;
	105	}
	106
	107	static int ntrig_input_mapped(struct hid_device hdev, struct hid_input hi,
	108	struct hid_field field, struct hid_usage usage,
	109	unsigned long *bit, int max)
	110	{
dbf2b17d RR	111	/* No special mappings needed for the pen and single touch */
dbf2b17d RR	112	if (field->physical)
943ed464	113	return 0;
b0549cf1	114
94011f93 RR	115	if (usage->type == EV_KEY \|\| usage->type == EV_REL
	116	\|\| usage->type == EV_ABS)
	117	clear_bit(usage->code, *bit);
	118
	119	return 0;
	120	}
57fd637a SC	121
	122	/*
	123	* this function is called upon all reports
	124	* so that we can filter contact point information,
	125	* decide whether we are in multi or single touch mode
	126	* and call input_mt_sync after each point if necessary
	127	*/
	128	static int ntrig_event (struct hid_device hid, struct hid_field field,
	129	struct hid_usage *usage, __s32 value)
	130	{
	131	struct input_dev *input = field->hidinput->input;
	132	struct ntrig_data *nd = hid_get_drvdata(hid);
	133
943ed464 RR	134	/* No special handling needed for the pen */
	135	if (field->application == HID_DG_PEN)
	136	return 0;
	137
57fd637a SC	138	if (hid->claimed & HID_CLAIMED_INPUT) {
57fd637a SC	139	switch (usage->hid) {
dbf2b17d RR	140	case 0xff000001:
	141	/* Tag indicating the start of a multitouch group */
	142	nd->reading_mt = 1;
250d3775	143	nd->first_contact_touch = 0;
dbf2b17d	144	break;
2886539d	145	case HID_DG_TIPSWITCH:
250d3775	146	nd->tipswitch = value;
2886539d RR	147	/* Prevent emission of touch until validated */
2886539d RR	148	return 1;
dbf2b17d RR	149	case HID_DG_CONFIDENCE:
	150	nd->confidence = value;
	151	break;
57fd637a SC	152	case HID_GD_X:
57fd637a SC	153	nd->x = value;
dbf2b17d RR	154	/* Clear the contact footer */
dbf2b17d RR	155	nd->mt_foot_count = 0;
57fd637a SC	156	break;
	157	case HID_GD_Y:
	158	nd->y = value;
	159	break;
	160	case HID_DG_CONTACTID:
	161	nd->id = value;
57fd637a SC	162	break;
	163	case HID_DG_WIDTH:
	164	nd->w = value;
	165	break;
	166	case HID_DG_HEIGHT:
	167	nd->h = value;
	168	/*
	169	* when in single touch mode, this is the last
	170	* report received in a finger event. We want
	171	* to emit a normal (X, Y) position
	172	*/
dbf2b17d	173	if (!nd->reading_mt) {
250d3775 RR	174	/*
	175	* TipSwitch indicates the presence of a
	176	* finger in single touch mode.
	177	*/
2170c5a8	178	input_report_key(input, BTN_TOUCH,
250d3775 RR	179	nd->tipswitch);
	180	input_report_key(input, BTN_TOOL_DOUBLETAP,
	181	nd->tipswitch);
57fd637a SC	182	input_event(input, EV_ABS, ABS_X, nd->x);
57fd637a SC	183	input_event(input, EV_ABS, ABS_Y, nd->y);
57fd637a SC	184	}
	185	break;
	186	case 0xff000002:
	187	/*
	188	* we receive this when the device is in multitouch
	189	* mode. The first of the three values tagged with
	190	* this usage tells if the contact point is real
	191	* or a placeholder
	192	*/
dbf2b17d RR	193
	194	/* Shouldn't get more than 4 footer packets, so skip */
	195	if (nd->mt_foot_count >= 4)
	196	break;
	197
	198	nd->mt_footer[nd->mt_foot_count++] = value;
	199
	200	/* if the footer isn't complete break */
	201	if (nd->mt_foot_count != 4)
	202	break;
	203
	204	/* Pen activity signal, trigger end of touch. */
	205	if (nd->mt_footer[2]) {
	206	nd->confidence = 0;
57fd637a	207	break;
dbf2b17d RR	208	}
	209
	210	/* If the contact was invalid */
	211	if (!(nd->confidence && nd->mt_footer[0])
	212	\|\| nd->w <= 250
	213	\|\| nd->h <= 190) {
	214	nd->confidence = 0;
	215	break;
	216	}
	217
57fd637a SC	218	/* emit a normal (X, Y) for the first point only */
57fd637a SC	219	if (nd->id == 0) {
250d3775 RR	220	/*
	221	* TipSwitch is superfluous in multitouch
	222	* mode. The footer events tell us
	223	* if there is a finger on the screen or
	224	* not.
	225	*/
	226	nd->first_contact_touch = nd->confidence;
57fd637a SC	227	input_event(input, EV_ABS, ABS_X, nd->x);
	228	input_event(input, EV_ABS, ABS_Y, nd->y);
	229	}
	230	input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
	231	input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
	232	if (nd->w > nd->h) {
	233	input_event(input, EV_ABS,
	234	ABS_MT_ORIENTATION, 1);
	235	input_event(input, EV_ABS,
	236	ABS_MT_TOUCH_MAJOR, nd->w);
	237	input_event(input, EV_ABS,
	238	ABS_MT_TOUCH_MINOR, nd->h);
	239	} else {
	240	input_event(input, EV_ABS,
	241	ABS_MT_ORIENTATION, 0);
	242	input_event(input, EV_ABS,
	243	ABS_MT_TOUCH_MAJOR, nd->h);
	244	input_event(input, EV_ABS,
	245	ABS_MT_TOUCH_MINOR, nd->w);
	246	}
	247	input_mt_sync(field->hidinput->input);
dbf2b17d RR	248	break;
	249
	250	case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
	251	if (!nd->reading_mt)
	252	break;
	253
	254	nd->reading_mt = 0;
	255
250d3775	256	if (nd->first_contact_touch) {
ed7e2ca2	257	input_report_key(input, BTN_TOOL_DOUBLETAP, 1);
dbf2b17d RR	258	input_report_key(input, BTN_TOUCH, 1);
dbf2b17d RR	259	} else {
ed7e2ca2	260	input_report_key(input, BTN_TOOL_DOUBLETAP, 0);
2886539d	261	input_report_key(input, BTN_TOUCH, 0);
dbf2b17d	262	}
57fd637a SC	263	break;
	264
	265	default:
	266	/* fallback to the generic hidinput handling */
	267	return 0;
	268	}
	269	}
	270
	271	/* we have handled the hidinput part, now remains hiddev */
943ed464 RR	272	if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_hid_event)
943ed464 RR	273	hid->hiddev_hid_event(hid, field, usage, value);
57fd637a SC	274
	275	return 1;
	276	}
	277
	278	static int ntrig_probe(struct hid_device hdev, const struct hid_device_id id)
	279	{
	280	int ret;
	281	struct ntrig_data *nd;
943ed464 RR	282	struct hid_input *hidinput;
943ed464 RR	283	struct input_dev *input;
6549981b	284	struct hid_report *report;
943ed464 RR	285
	286	if (id->driver_data)
	287	hdev->quirks \|= HID_QUIRK_MULTI_INPUT;
57fd637a SC	288
	289	nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
	290	if (!nd) {
	291	dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
	292	return -ENOMEM;
	293	}
dbf2b17d RR	294
dbf2b17d RR	295	nd->reading_mt = 0;
57fd637a SC	296	hid_set_drvdata(hdev, nd);
	297
	298	ret = hid_parse(hdev);
943ed464 RR	299	if (ret) {
	300	dev_err(&hdev->dev, "parse failed\n");
	301	goto err_free;
	302	}
	303
	304	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
	305	if (ret) {
	306	dev_err(&hdev->dev, "hw start failed\n");
	307	goto err_free;
	308	}
57fd637a	309
837b4753	310
943ed464	311	list_for_each_entry(hidinput, &hdev->inputs, list) {
2886539d RR	312	if (hidinput->report->maxfield < 1)
	313	continue;
	314
943ed464 RR	315	input = hidinput->input;
	316	switch (hidinput->report->field[0]->application) {
	317	case HID_DG_PEN:
	318	input->name = "N-Trig Pen";
	319	break;
	320	case HID_DG_TOUCHSCREEN:
2886539d RR	321	/* These keys are redundant for fingers, clear them
2886539d RR	322	* to prevent incorrect identification */
dbf2b17d	323	__clear_bit(BTN_TOOL_PEN, input->keybit);
2886539d RR	324	__clear_bit(BTN_TOOL_FINGER, input->keybit);
2886539d RR	325	__clear_bit(BTN_0, input->keybit);
dbf2b17d	326	__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
943ed464 RR	327	/*
	328	* The physical touchscreen (single touch)
	329	* input has a value for physical, whereas
	330	* the multitouch only has logical input
	331	* fields.
	332	*/
	333	input->name =
	334	(hidinput->report->field[0]
	335	->physical) ?
	336	"N-Trig Touchscreen" :
	337	"N-Trig MultiTouch";
	338	break;
	339	}
	340	}
	341
c0858552 JK	342	/* This is needed for devices with more recent firmware versions */
c0858552 JK	343	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0x0a];
6549981b SC	344	if (report)
	345	usbhid_submit_report(hdev, report, USB_DIR_OUT);
	346
	347
943ed464 RR	348	return 0;
	349	err_free:
	350	kfree(nd);
57fd637a SC	351	return ret;
	352	}
	353
	354	static void ntrig_remove(struct hid_device *hdev)
	355	{
	356	hid_hw_stop(hdev);
	357	kfree(hid_get_drvdata(hdev));
	358	}
	359
94011f93 RR	360	static const struct hid_device_id ntrig_devices[] = {
	361	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
	362	.driver_data = NTRIG_DUPLICATE_USAGES },
	363	{ }
	364	};
	365	MODULE_DEVICE_TABLE(hid, ntrig_devices);
	366
57fd637a SC	367	static const struct hid_usage_id ntrig_grabbed_usages[] = {
57fd637a SC	368	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
943ed464	369	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 }
57fd637a SC	370	};
57fd637a SC	371
94011f93 RR	372	static struct hid_driver ntrig_driver = {
	373	.name = "ntrig",
	374	.id_table = ntrig_devices,
57fd637a SC	375	.probe = ntrig_probe,
57fd637a SC	376	.remove = ntrig_remove,
94011f93 RR	377	.input_mapping = ntrig_input_mapping,
94011f93 RR	378	.input_mapped = ntrig_input_mapped,
57fd637a SC	379	.usage_table = ntrig_grabbed_usages,
57fd637a SC	380	.event = ntrig_event,
94011f93 RR	381	};
94011f93 RR	382
a24f423b	383	static int __init ntrig_init(void)
94011f93 RR	384	{
	385	return hid_register_driver(&ntrig_driver);
	386	}
	387
a24f423b	388	static void __exit ntrig_exit(void)
94011f93 RR	389	{
	390	hid_unregister_driver(&ntrig_driver);
	391	}
	392
	393	module_init(ntrig_init);
	394	module_exit(ntrig_exit);
	395	MODULE_LICENSE("GPL");