[mirror_ubuntu-eoan-kernel.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

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

struct ntrig_data {
	/* Incoming raw values for a single contact */
	__u16 x, y, w, h;
	__u16 id;
	__u8 confidence;

	bool reading_mt;
	__u8 first_contact_confidence;

	__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_confidence = 0;
			break;
		case HID_DG_TIPSWITCH:
			/* 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) {
				input_report_key(input, BTN_TOOL_DOUBLETAP,
						 (nd->confidence != 0));
				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) {
				nd->first_contact_confidence = 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_confidence) {
				switch (value) {
				case 0:	/* for single touch devices */
				case 1:
					input_report_key(input,
							BTN_TOOL_DOUBLETAP, 1);
					break;
				case 2:
					input_report_key(input,
							BTN_TOOL_TRIPLETAP, 1);
					break;
				case 3:
				default:
					input_report_key(input,
							BTN_TOOL_QUADTAP, 1);
				}
				input_report_key(input, BTN_TOUCH, 1);
			} else {
				input_report_key(input,
						BTN_TOOL_DOUBLETAP, 0);
				input_report_key(input,
						BTN_TOOL_TRIPLETAP, 0);
				input_report_key(input,
						BTN_TOOL_QUADTAP, 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);
			/*
			 * A little something special to enable
			 * two and three finger taps.
			 */
			__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
			__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
			__set_bit(BTN_TOOL_QUADTAP, 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;
		}
	}

	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
	27	#define nt_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
	28	EV_KEY, (c))
	29
57fd637a	30	struct ntrig_data {
dbf2b17d RR	31	/* Incoming raw values for a single contact */
	32	__u16 x, y, w, h;
	33	__u16 id;
	34	__u8 confidence;
	35
	36	bool reading_mt;
	37	__u8 first_contact_confidence;
	38
	39	__u8 mt_footer[4];
	40	__u8 mt_foot_count;
57fd637a SC	41	};
	42
	43	/*
	44	* this driver is aimed at two firmware versions in circulation:
	45	* - dual pen/finger single touch
	46	* - finger multitouch, pen not working
	47	*/
	48
94011f93 RR	49	static int ntrig_input_mapping(struct hid_device hdev, struct hid_input hi,
	50	struct hid_field field, struct hid_usage usage,
	51	unsigned long *bit, int max)
	52	{
dbf2b17d RR	53	/* No special mappings needed for the pen and single touch */
dbf2b17d RR	54	if (field->physical)
943ed464 RR	55	return 0;
943ed464 RR	56
57fd637a	57	switch (usage->hid & HID_USAGE_PAGE) {
57fd637a SC	58	case HID_UP_GENDESK:
	59	switch (usage->hid) {
	60	case HID_GD_X:
	61	hid_map_usage(hi, usage, bit, max,
	62	EV_ABS, ABS_MT_POSITION_X);
	63	input_set_abs_params(hi->input, ABS_X,
	64	field->logical_minimum,
	65	field->logical_maximum, 0, 0);
	66	return 1;
	67	case HID_GD_Y:
	68	hid_map_usage(hi, usage, bit, max,
	69	EV_ABS, ABS_MT_POSITION_Y);
	70	input_set_abs_params(hi->input, ABS_Y,
	71	field->logical_minimum,
	72	field->logical_maximum, 0, 0);
	73	return 1;
	74	}
	75	return 0;
	76
	77	case HID_UP_DIGITIZER:
	78	switch (usage->hid) {
	79	/* we do not want to map these for now */
dbf2b17d	80	case HID_DG_CONTACTID: /* Not trustworthy, squelch for now */
57fd637a SC	81	case HID_DG_INPUTMODE:
57fd637a SC	82	case HID_DG_DEVICEINDEX:
57fd637a SC	83	case HID_DG_CONTACTMAX:
	84	return -1;
	85
57fd637a SC	86	/* width/height mapped on TouchMajor/TouchMinor/Orientation */
	87	case HID_DG_WIDTH:
	88	hid_map_usage(hi, usage, bit, max,
	89	EV_ABS, ABS_MT_TOUCH_MAJOR);
	90	return 1;
	91	case HID_DG_HEIGHT:
	92	hid_map_usage(hi, usage, bit, max,
	93	EV_ABS, ABS_MT_TOUCH_MINOR);
	94	input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
	95	0, 1, 0, 0);
	96	return 1;
	97	}
	98	return 0;
	99
	100	case 0xff000000:
	101	/* we do not want to map these: no input-oriented meaning */
	102	return -1;
94011f93	103	}
57fd637a	104
94011f93 RR	105	return 0;
	106	}
	107
	108	static int ntrig_input_mapped(struct hid_device hdev, struct hid_input hi,
	109	struct hid_field field, struct hid_usage usage,
	110	unsigned long *bit, int max)
	111	{
dbf2b17d RR	112	/* No special mappings needed for the pen and single touch */
dbf2b17d RR	113	if (field->physical)
943ed464	114	return 0;
b0549cf1	115
94011f93 RR	116	if (usage->type == EV_KEY \|\| usage->type == EV_REL
	117	\|\| usage->type == EV_ABS)
	118	clear_bit(usage->code, *bit);
	119
	120	return 0;
	121	}
57fd637a SC	122
	123	/*
	124	* this function is called upon all reports
	125	* so that we can filter contact point information,
	126	* decide whether we are in multi or single touch mode
	127	* and call input_mt_sync after each point if necessary
	128	*/
	129	static int ntrig_event (struct hid_device hid, struct hid_field field,
	130	struct hid_usage *usage, __s32 value)
	131	{
	132	struct input_dev *input = field->hidinput->input;
	133	struct ntrig_data *nd = hid_get_drvdata(hid);
	134
943ed464 RR	135	/* No special handling needed for the pen */
	136	if (field->application == HID_DG_PEN)
	137	return 0;
	138
57fd637a SC	139	if (hid->claimed & HID_CLAIMED_INPUT) {
57fd637a SC	140	switch (usage->hid) {
dbf2b17d RR	141	case 0xff000001:
	142	/* Tag indicating the start of a multitouch group */
	143	nd->reading_mt = 1;
	144	nd->first_contact_confidence = 0;
	145	break;
2886539d RR	146	case HID_DG_TIPSWITCH:
	147	/* Prevent emission of touch until validated */
	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) {
ff5cf34c RR	174	input_report_key(input, BTN_TOOL_DOUBLETAP,
ff5cf34c RR	175	(nd->confidence != 0));
57fd637a SC	176	input_event(input, EV_ABS, ABS_X, nd->x);
57fd637a SC	177	input_event(input, EV_ABS, ABS_Y, nd->y);
57fd637a SC	178	}
	179	break;
	180	case 0xff000002:
	181	/*
	182	* we receive this when the device is in multitouch
	183	* mode. The first of the three values tagged with
	184	* this usage tells if the contact point is real
	185	* or a placeholder
	186	*/
dbf2b17d RR	187
	188	/* Shouldn't get more than 4 footer packets, so skip */
	189	if (nd->mt_foot_count >= 4)
	190	break;
	191
	192	nd->mt_footer[nd->mt_foot_count++] = value;
	193
	194	/* if the footer isn't complete break */
	195	if (nd->mt_foot_count != 4)
	196	break;
	197
	198	/* Pen activity signal, trigger end of touch. */
	199	if (nd->mt_footer[2]) {
	200	nd->confidence = 0;
57fd637a	201	break;
dbf2b17d RR	202	}
	203
	204	/* If the contact was invalid */
	205	if (!(nd->confidence && nd->mt_footer[0])
	206	\|\| nd->w <= 250
	207	\|\| nd->h <= 190) {
	208	nd->confidence = 0;
	209	break;
	210	}
	211
57fd637a SC	212	/* emit a normal (X, Y) for the first point only */
57fd637a SC	213	if (nd->id == 0) {
dbf2b17d	214	nd->first_contact_confidence = nd->confidence;
57fd637a SC	215	input_event(input, EV_ABS, ABS_X, nd->x);
	216	input_event(input, EV_ABS, ABS_Y, nd->y);
	217	}
	218	input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
	219	input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
	220	if (nd->w > nd->h) {
	221	input_event(input, EV_ABS,
	222	ABS_MT_ORIENTATION, 1);
	223	input_event(input, EV_ABS,
	224	ABS_MT_TOUCH_MAJOR, nd->w);
	225	input_event(input, EV_ABS,
	226	ABS_MT_TOUCH_MINOR, nd->h);
	227	} else {
	228	input_event(input, EV_ABS,
	229	ABS_MT_ORIENTATION, 0);
	230	input_event(input, EV_ABS,
	231	ABS_MT_TOUCH_MAJOR, nd->h);
	232	input_event(input, EV_ABS,
	233	ABS_MT_TOUCH_MINOR, nd->w);
	234	}
	235	input_mt_sync(field->hidinput->input);
dbf2b17d RR	236	break;
	237
	238	case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
	239	if (!nd->reading_mt)
	240	break;
	241
	242	nd->reading_mt = 0;
	243
	244	if (nd->first_contact_confidence) {
	245	switch (value) {
	246	case 0: /* for single touch devices */
	247	case 1:
	248	input_report_key(input,
	249	BTN_TOOL_DOUBLETAP, 1);
	250	break;
	251	case 2:
	252	input_report_key(input,
	253	BTN_TOOL_TRIPLETAP, 1);
	254	break;
	255	case 3:
	256	default:
	257	input_report_key(input,
	258	BTN_TOOL_QUADTAP, 1);
	259	}
	260	input_report_key(input, BTN_TOUCH, 1);
	261	} else {
	262	input_report_key(input,
	263	BTN_TOOL_DOUBLETAP, 0);
	264	input_report_key(input,
	265	BTN_TOOL_TRIPLETAP, 0);
	266	input_report_key(input,
	267	BTN_TOOL_QUADTAP, 0);
2886539d	268	input_report_key(input, BTN_TOUCH, 0);
dbf2b17d	269	}
57fd637a SC	270	break;
	271
	272	default:
	273	/* fallback to the generic hidinput handling */
	274	return 0;
	275	}
	276	}
	277
	278	/* we have handled the hidinput part, now remains hiddev */
943ed464 RR	279	if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_hid_event)
943ed464 RR	280	hid->hiddev_hid_event(hid, field, usage, value);
57fd637a SC	281
	282	return 1;
	283	}
	284
	285	static int ntrig_probe(struct hid_device hdev, const struct hid_device_id id)
	286	{
	287	int ret;
	288	struct ntrig_data *nd;
943ed464 RR	289	struct hid_input *hidinput;
943ed464 RR	290	struct input_dev *input;
6549981b	291	struct hid_report *report;
943ed464 RR	292
	293	if (id->driver_data)
	294	hdev->quirks \|= HID_QUIRK_MULTI_INPUT;
57fd637a SC	295
	296	nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
	297	if (!nd) {
	298	dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
	299	return -ENOMEM;
	300	}
dbf2b17d RR	301
dbf2b17d RR	302	nd->reading_mt = 0;
57fd637a SC	303	hid_set_drvdata(hdev, nd);
	304
	305	ret = hid_parse(hdev);
943ed464 RR	306	if (ret) {
	307	dev_err(&hdev->dev, "parse failed\n");
	308	goto err_free;
	309	}
	310
	311	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
	312	if (ret) {
	313	dev_err(&hdev->dev, "hw start failed\n");
	314	goto err_free;
	315	}
57fd637a	316
837b4753	317
943ed464	318	list_for_each_entry(hidinput, &hdev->inputs, list) {
2886539d RR	319	if (hidinput->report->maxfield < 1)
	320	continue;
	321
943ed464 RR	322	input = hidinput->input;
	323	switch (hidinput->report->field[0]->application) {
	324	case HID_DG_PEN:
	325	input->name = "N-Trig Pen";
	326	break;
	327	case HID_DG_TOUCHSCREEN:
2886539d RR	328	/* These keys are redundant for fingers, clear them
2886539d RR	329	* to prevent incorrect identification */
dbf2b17d	330	__clear_bit(BTN_TOOL_PEN, input->keybit);
2886539d RR	331	__clear_bit(BTN_TOOL_FINGER, input->keybit);
2886539d RR	332	__clear_bit(BTN_0, input->keybit);
dbf2b17d RR	333	/*
	334	* A little something special to enable
	335	* two and three finger taps.
	336	*/
	337	__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
	338	__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
	339	__set_bit(BTN_TOOL_QUADTAP, input->keybit);
943ed464 RR	340	/*
	341	* The physical touchscreen (single touch)
	342	* input has a value for physical, whereas
	343	* the multitouch only has logical input
	344	* fields.
	345	*/
	346	input->name =
	347	(hidinput->report->field[0]
	348	->physical) ?
	349	"N-Trig Touchscreen" :
	350	"N-Trig MultiTouch";
	351	break;
	352	}
	353	}
	354
6549981b SC	355	report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0x0a];
	356	if (report)
	357	usbhid_submit_report(hdev, report, USB_DIR_OUT);
	358
	359
943ed464 RR	360	return 0;
	361	err_free:
	362	kfree(nd);
57fd637a SC	363	return ret;
	364	}
	365
	366	static void ntrig_remove(struct hid_device *hdev)
	367	{
	368	hid_hw_stop(hdev);
	369	kfree(hid_get_drvdata(hdev));
	370	}
	371
94011f93 RR	372	static const struct hid_device_id ntrig_devices[] = {
	373	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
	374	.driver_data = NTRIG_DUPLICATE_USAGES },
	375	{ }
	376	};
	377	MODULE_DEVICE_TABLE(hid, ntrig_devices);
	378
57fd637a SC	379	static const struct hid_usage_id ntrig_grabbed_usages[] = {
57fd637a SC	380	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
943ed464	381	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 }
57fd637a SC	382	};
57fd637a SC	383
94011f93 RR	384	static struct hid_driver ntrig_driver = {
	385	.name = "ntrig",
	386	.id_table = ntrig_devices,
57fd637a SC	387	.probe = ntrig_probe,
57fd637a SC	388	.remove = ntrig_remove,
94011f93 RR	389	.input_mapping = ntrig_input_mapping,
94011f93 RR	390	.input_mapped = ntrig_input_mapped,
57fd637a SC	391	.usage_table = ntrig_grabbed_usages,
57fd637a SC	392	.event = ntrig_event,
94011f93 RR	393	};
94011f93 RR	394
a24f423b	395	static int __init ntrig_init(void)
94011f93 RR	396	{
	397	return hid_register_driver(&ntrig_driver);
	398	}
	399
a24f423b	400	static void __exit ntrig_exit(void)
94011f93 RR	401	{
	402	hid_unregister_driver(&ntrig_driver);
	403	}
	404
	405	module_init(ntrig_init);
	406	module_exit(ntrig_exit);
	407	MODULE_LICENSE("GPL");