[mirror_ubuntu-artful-kernel.git] / drivers / hid / hid-ntrig.c

/*
 *  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 <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;

	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;
		}
	}

	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	*
94011f93	4	* Copyright (c) 2008 Rafi Rubin
57fd637a	5	* Copyright (c) 2009 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>
	18	#include <linux/module.h>
5a0e3ad6	19	#include <linux/slab.h>
94011f93 RR	20
	21	#include "hid-ids.h"
	22
	23	#define NTRIG_DUPLICATE_USAGES 0x001
	24
	25	#define nt_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
	26	EV_KEY, (c))
	27
57fd637a	28	struct ntrig_data {
dbf2b17d RR	29	/* Incoming raw values for a single contact */
	30	__u16 x, y, w, h;
	31	__u16 id;
	32	__u8 confidence;
	33
	34	bool reading_mt;
	35	__u8 first_contact_confidence;
	36
	37	__u8 mt_footer[4];
	38	__u8 mt_foot_count;
57fd637a SC	39	};
	40
	41	/*
	42	* this driver is aimed at two firmware versions in circulation:
	43	* - dual pen/finger single touch
	44	* - finger multitouch, pen not working
	45	*/
	46
94011f93 RR	47	static int ntrig_input_mapping(struct hid_device hdev, struct hid_input hi,
	48	struct hid_field field, struct hid_usage usage,
	49	unsigned long *bit, int max)
	50	{
dbf2b17d RR	51	/* No special mappings needed for the pen and single touch */
dbf2b17d RR	52	if (field->physical)
943ed464 RR	53	return 0;
943ed464 RR	54
57fd637a	55	switch (usage->hid & HID_USAGE_PAGE) {
57fd637a SC	56	case HID_UP_GENDESK:
	57	switch (usage->hid) {
	58	case HID_GD_X:
	59	hid_map_usage(hi, usage, bit, max,
	60	EV_ABS, ABS_MT_POSITION_X);
	61	input_set_abs_params(hi->input, ABS_X,
	62	field->logical_minimum,
	63	field->logical_maximum, 0, 0);
	64	return 1;
	65	case HID_GD_Y:
	66	hid_map_usage(hi, usage, bit, max,
	67	EV_ABS, ABS_MT_POSITION_Y);
	68	input_set_abs_params(hi->input, ABS_Y,
	69	field->logical_minimum,
	70	field->logical_maximum, 0, 0);
	71	return 1;
	72	}
	73	return 0;
	74
	75	case HID_UP_DIGITIZER:
	76	switch (usage->hid) {
	77	/* we do not want to map these for now */
dbf2b17d	78	case HID_DG_CONTACTID: /* Not trustworthy, squelch for now */
57fd637a SC	79	case HID_DG_INPUTMODE:
57fd637a SC	80	case HID_DG_DEVICEINDEX:
57fd637a SC	81	case HID_DG_CONTACTMAX:
	82	return -1;
	83
57fd637a SC	84	/* width/height mapped on TouchMajor/TouchMinor/Orientation */
	85	case HID_DG_WIDTH:
	86	hid_map_usage(hi, usage, bit, max,
	87	EV_ABS, ABS_MT_TOUCH_MAJOR);
	88	return 1;
	89	case HID_DG_HEIGHT:
	90	hid_map_usage(hi, usage, bit, max,
	91	EV_ABS, ABS_MT_TOUCH_MINOR);
	92	input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
	93	0, 1, 0, 0);
	94	return 1;
	95	}
	96	return 0;
	97
	98	case 0xff000000:
	99	/* we do not want to map these: no input-oriented meaning */
	100	return -1;
94011f93	101	}
57fd637a	102
94011f93 RR	103	return 0;
	104	}
	105
	106	static int ntrig_input_mapped(struct hid_device hdev, struct hid_input hi,
	107	struct hid_field field, struct hid_usage usage,
	108	unsigned long *bit, int max)
	109	{
dbf2b17d RR	110	/* No special mappings needed for the pen and single touch */
dbf2b17d RR	111	if (field->physical)
943ed464	112	return 0;
b0549cf1	113
94011f93 RR	114	if (usage->type == EV_KEY \|\| usage->type == EV_REL
	115	\|\| usage->type == EV_ABS)
	116	clear_bit(usage->code, *bit);
	117
	118	return 0;
	119	}
57fd637a SC	120
	121	/*
	122	* this function is called upon all reports
	123	* so that we can filter contact point information,
	124	* decide whether we are in multi or single touch mode
	125	* and call input_mt_sync after each point if necessary
	126	*/
	127	static int ntrig_event (struct hid_device hid, struct hid_field field,
	128	struct hid_usage *usage, __s32 value)
	129	{
	130	struct input_dev *input = field->hidinput->input;
	131	struct ntrig_data *nd = hid_get_drvdata(hid);
	132
943ed464 RR	133	/* No special handling needed for the pen */
	134	if (field->application == HID_DG_PEN)
	135	return 0;
	136
57fd637a SC	137	if (hid->claimed & HID_CLAIMED_INPUT) {
57fd637a SC	138	switch (usage->hid) {
dbf2b17d RR	139	case 0xff000001:
	140	/* Tag indicating the start of a multitouch group */
	141	nd->reading_mt = 1;
	142	nd->first_contact_confidence = 0;
	143	break;
2886539d RR	144	case HID_DG_TIPSWITCH:
	145	/* Prevent emission of touch until validated */
	146	return 1;
dbf2b17d RR	147	case HID_DG_CONFIDENCE:
	148	nd->confidence = value;
	149	break;
57fd637a SC	150	case HID_GD_X:
57fd637a SC	151	nd->x = value;
dbf2b17d RR	152	/* Clear the contact footer */
dbf2b17d RR	153	nd->mt_foot_count = 0;
57fd637a SC	154	break;
	155	case HID_GD_Y:
	156	nd->y = value;
	157	break;
	158	case HID_DG_CONTACTID:
	159	nd->id = value;
57fd637a SC	160	break;
	161	case HID_DG_WIDTH:
	162	nd->w = value;
	163	break;
	164	case HID_DG_HEIGHT:
	165	nd->h = value;
	166	/*
	167	* when in single touch mode, this is the last
	168	* report received in a finger event. We want
	169	* to emit a normal (X, Y) position
	170	*/
dbf2b17d	171	if (!nd->reading_mt) {
ff5cf34c RR	172	input_report_key(input, BTN_TOOL_DOUBLETAP,
ff5cf34c RR	173	(nd->confidence != 0));
57fd637a SC	174	input_event(input, EV_ABS, ABS_X, nd->x);
57fd637a SC	175	input_event(input, EV_ABS, ABS_Y, nd->y);
57fd637a SC	176	}
	177	break;
	178	case 0xff000002:
	179	/*
	180	* we receive this when the device is in multitouch
	181	* mode. The first of the three values tagged with
	182	* this usage tells if the contact point is real
	183	* or a placeholder
	184	*/
dbf2b17d RR	185
	186	/* Shouldn't get more than 4 footer packets, so skip */
	187	if (nd->mt_foot_count >= 4)
	188	break;
	189
	190	nd->mt_footer[nd->mt_foot_count++] = value;
	191
	192	/* if the footer isn't complete break */
	193	if (nd->mt_foot_count != 4)
	194	break;
	195
	196	/* Pen activity signal, trigger end of touch. */
	197	if (nd->mt_footer[2]) {
	198	nd->confidence = 0;
57fd637a	199	break;
dbf2b17d RR	200	}
	201
	202	/* If the contact was invalid */
	203	if (!(nd->confidence && nd->mt_footer[0])
	204	\|\| nd->w <= 250
	205	\|\| nd->h <= 190) {
	206	nd->confidence = 0;
	207	break;
	208	}
	209
57fd637a SC	210	/* emit a normal (X, Y) for the first point only */
57fd637a SC	211	if (nd->id == 0) {
dbf2b17d	212	nd->first_contact_confidence = nd->confidence;
57fd637a SC	213	input_event(input, EV_ABS, ABS_X, nd->x);
	214	input_event(input, EV_ABS, ABS_Y, nd->y);
	215	}
	216	input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
	217	input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
	218	if (nd->w > nd->h) {
	219	input_event(input, EV_ABS,
	220	ABS_MT_ORIENTATION, 1);
	221	input_event(input, EV_ABS,
	222	ABS_MT_TOUCH_MAJOR, nd->w);
	223	input_event(input, EV_ABS,
	224	ABS_MT_TOUCH_MINOR, nd->h);
	225	} else {
	226	input_event(input, EV_ABS,
	227	ABS_MT_ORIENTATION, 0);
	228	input_event(input, EV_ABS,
	229	ABS_MT_TOUCH_MAJOR, nd->h);
	230	input_event(input, EV_ABS,
	231	ABS_MT_TOUCH_MINOR, nd->w);
	232	}
	233	input_mt_sync(field->hidinput->input);
dbf2b17d RR	234	break;
	235
	236	case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
	237	if (!nd->reading_mt)
	238	break;
	239
	240	nd->reading_mt = 0;
	241
	242	if (nd->first_contact_confidence) {
	243	switch (value) {
	244	case 0: /* for single touch devices */
	245	case 1:
	246	input_report_key(input,
	247	BTN_TOOL_DOUBLETAP, 1);
	248	break;
	249	case 2:
	250	input_report_key(input,
	251	BTN_TOOL_TRIPLETAP, 1);
	252	break;
	253	case 3:
	254	default:
	255	input_report_key(input,
	256	BTN_TOOL_QUADTAP, 1);
	257	}
	258	input_report_key(input, BTN_TOUCH, 1);
	259	} else {
	260	input_report_key(input,
	261	BTN_TOOL_DOUBLETAP, 0);
	262	input_report_key(input,
	263	BTN_TOOL_TRIPLETAP, 0);
	264	input_report_key(input,
	265	BTN_TOOL_QUADTAP, 0);
2886539d	266	input_report_key(input, BTN_TOUCH, 0);
dbf2b17d	267	}
57fd637a SC	268	break;
	269
	270	default:
	271	/* fallback to the generic hidinput handling */
	272	return 0;
	273	}
	274	}
	275
	276	/* we have handled the hidinput part, now remains hiddev */
943ed464 RR	277	if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_hid_event)
943ed464 RR	278	hid->hiddev_hid_event(hid, field, usage, value);
57fd637a SC	279
	280	return 1;
	281	}
	282
	283	static int ntrig_probe(struct hid_device hdev, const struct hid_device_id id)
	284	{
	285	int ret;
	286	struct ntrig_data *nd;
943ed464 RR	287	struct hid_input *hidinput;
	288	struct input_dev *input;
	289
	290	if (id->driver_data)
	291	hdev->quirks \|= HID_QUIRK_MULTI_INPUT;
57fd637a SC	292
	293	nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
	294	if (!nd) {
	295	dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
	296	return -ENOMEM;
	297	}
dbf2b17d RR	298
dbf2b17d RR	299	nd->reading_mt = 0;
57fd637a SC	300	hid_set_drvdata(hdev, nd);
	301
	302	ret = hid_parse(hdev);
943ed464 RR	303	if (ret) {
	304	dev_err(&hdev->dev, "parse failed\n");
	305	goto err_free;
	306	}
	307
	308	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
	309	if (ret) {
	310	dev_err(&hdev->dev, "hw start failed\n");
	311	goto err_free;
	312	}
57fd637a	313
837b4753	314
943ed464	315	list_for_each_entry(hidinput, &hdev->inputs, list) {
2886539d RR	316	if (hidinput->report->maxfield < 1)
	317	continue;
	318
943ed464 RR	319	input = hidinput->input;
	320	switch (hidinput->report->field[0]->application) {
	321	case HID_DG_PEN:
	322	input->name = "N-Trig Pen";
	323	break;
	324	case HID_DG_TOUCHSCREEN:
2886539d RR	325	/* These keys are redundant for fingers, clear them
2886539d RR	326	* to prevent incorrect identification */
dbf2b17d	327	__clear_bit(BTN_TOOL_PEN, input->keybit);
2886539d RR	328	__clear_bit(BTN_TOOL_FINGER, input->keybit);
2886539d RR	329	__clear_bit(BTN_0, input->keybit);
dbf2b17d RR	330	/*
	331	* A little something special to enable
	332	* two and three finger taps.
	333	*/
	334	__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
	335	__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
	336	__set_bit(BTN_TOOL_QUADTAP, input->keybit);
943ed464 RR	337	/*
	338	* The physical touchscreen (single touch)
	339	* input has a value for physical, whereas
	340	* the multitouch only has logical input
	341	* fields.
	342	*/
	343	input->name =
	344	(hidinput->report->field[0]
	345	->physical) ?
	346	"N-Trig Touchscreen" :
	347	"N-Trig MultiTouch";
	348	break;
	349	}
	350	}
	351
	352	return 0;
	353	err_free:
	354	kfree(nd);
57fd637a SC	355	return ret;
	356	}
	357
	358	static void ntrig_remove(struct hid_device *hdev)
	359	{
	360	hid_hw_stop(hdev);
	361	kfree(hid_get_drvdata(hdev));
	362	}
	363
94011f93 RR	364	static const struct hid_device_id ntrig_devices[] = {
	365	{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
	366	.driver_data = NTRIG_DUPLICATE_USAGES },
	367	{ }
	368	};
	369	MODULE_DEVICE_TABLE(hid, ntrig_devices);
	370
57fd637a SC	371	static const struct hid_usage_id ntrig_grabbed_usages[] = {
57fd637a SC	372	{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
943ed464	373	{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 }
57fd637a SC	374	};
57fd637a SC	375
94011f93 RR	376	static struct hid_driver ntrig_driver = {
	377	.name = "ntrig",
	378	.id_table = ntrig_devices,
57fd637a SC	379	.probe = ntrig_probe,
57fd637a SC	380	.remove = ntrig_remove,
94011f93 RR	381	.input_mapping = ntrig_input_mapping,
94011f93 RR	382	.input_mapped = ntrig_input_mapped,
57fd637a SC	383	.usage_table = ntrig_grabbed_usages,
57fd637a SC	384	.event = ntrig_event,
94011f93 RR	385	};
94011f93 RR	386
a24f423b	387	static int __init ntrig_init(void)
94011f93 RR	388	{
	389	return hid_register_driver(&ntrig_driver);
	390	}
	391
a24f423b	392	static void __exit ntrig_exit(void)
94011f93 RR	393	{
	394	hid_unregister_driver(&ntrig_driver);
	395	}
	396
	397	module_init(ntrig_init);
	398	module_exit(ntrig_exit);
	399	MODULE_LICENSE("GPL");