Message-ID: <20110107194918.GB29913@polaris.bitmath.org>
Date:	Fri, 7 Jan 2011 20:49:18 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...c.fr>
Cc:	Stephane Chatty <chatty@...c.fr>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC v3 3/5] hid-multitouch: support for PixCir-based panels

On Fri, Jan 07, 2011 at 07:42:40PM +0100, Benjamin Tissoires wrote:
> Created a driver for PixCir based dual-touch panels, including the one
> in the Hanvon tablet.  This is done in a code structure aimed at unifying
> support for several existing HID multitouch panels.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...c.fr>
> Signed-off-by: Stéphane Chatty <chatty@...c.fr>
> ---

It looks much better now. Just a few comments and some nit-picks inline.

>  drivers/hid/Kconfig          |    9 +
>  drivers/hid/Makefile         |    1 +
>  drivers/hid/hid-core.c       |    2 +
>  drivers/hid/hid-ids.h        |    4 +
>  drivers/hid/hid-multitouch.c |  468 ++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 484 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/hid/hid-multitouch.c
> 
> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> index 401acec..511554d 100644
> --- a/drivers/hid/Kconfig
> +++ b/drivers/hid/Kconfig
> @@ -285,6 +285,15 @@ config HID_MONTEREY
>  	---help---
>  	Support for Monterey Genius KB29E.
>  
> +config HID_MULTITOUCH
> +	tristate "HID Multitouch panels"
> +	depends on USB_HID
> +	---help---
> +	  Generic support for HID multitouch panels.
> +
> +	  Say Y here if you have one of the following devices:
> +	  - PixCir touchscreen

Should also mention how to compile as module, and what the module will be called.

> +
>  config HID_NTRIG
>  	tristate "N-Trig touch screen"
>  	depends on USB_HID
> diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
> index c335605..ec991d4 100644
> --- a/drivers/hid/Makefile
> +++ b/drivers/hid/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_HID_MAGICMOUSE)    += hid-magicmouse.o
>  obj-$(CONFIG_HID_MICROSOFT)	+= hid-microsoft.o
>  obj-$(CONFIG_HID_MONTEREY)	+= hid-monterey.o
>  obj-$(CONFIG_HID_MOSART)	+= hid-mosart.o
> +obj-$(CONFIG_HID_MULTITOUCH)	+= hid-multitouch.o
>  obj-$(CONFIG_HID_NTRIG)		+= hid-ntrig.o
>  obj-$(CONFIG_HID_ORTEK)		+= hid-ortek.o
>  obj-$(CONFIG_HID_PRODIKEYS)	+= hid-prodikeys.o
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index 88668ae..2b4d9b9 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -1286,6 +1286,7 @@ static const struct hid_device_id hid_blacklist[] = {
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_BELKIN, USB_DEVICE_ID_FLIP_KVM) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_BTC, USB_DEVICE_ID_BTC_EMPREX_REMOTE) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_BTC, USB_DEVICE_ID_BTC_EMPREX_REMOTE_2) },
> +	{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
> @@ -1312,6 +1313,7 @@ static const struct hid_device_id hid_blacklist[] = {
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_2) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_3) },
> +	{ HID_USB_DEVICE(USB_VENDOR_ID_HANVON, USB_DEVICE_ID_HANVON_MULTITOUCH) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_ERGO_525V) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD) },
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 0f150c7..17b444b 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -134,6 +134,7 @@
>  #define USB_DEVICE_ID_BTC_EMPREX_REMOTE_2	0x5577
>  
>  #define USB_VENDOR_ID_CANDO		0x2087
> +#define USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH 0x0703
>  #define USB_DEVICE_ID_CANDO_MULTI_TOUCH	0x0a01
>  #define USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6 0x0b03
>  #define USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6 0x0f01
> @@ -306,6 +307,9 @@
>  #define USB_DEVICE_ID_HANWANG_TABLET_FIRST	0x5000
>  #define USB_DEVICE_ID_HANWANG_TABLET_LAST	0x8fff
>  
> +#define USB_VENDOR_ID_HANVON		0x20b3
> +#define USB_DEVICE_ID_HANVON_MULTITOUCH	0x0a18
> +
>  #define USB_VENDOR_ID_HAPP		0x078b
>  #define USB_DEVICE_ID_UGCI_DRIVING	0x0010
>  #define USB_DEVICE_ID_UGCI_FLYING	0x0020
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> new file mode 100644
> index 0000000..3b05dfe
> --- /dev/null
> +++ b/drivers/hid/hid-multitouch.c
> @@ -0,0 +1,468 @@
> +/*
> + *  HID driver for multitouch panels
> + *
> + *  Copyright (c) 2010-2011 Stephane Chatty <chatty@...c.fr>
> + *  Copyright (c) 2010-2011 Benjamin Tissoires <benjamin.tissoires@...il.com>
> + *  Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France
> + *
> + */
> +
> +/*
> + * 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 <linux/usb.h>
> +#include <linux/input/mt.h>
> +#include "usbhid/usbhid.h"
> +
> +
> +MODULE_AUTHOR("Stephane Chatty <chatty@...c.fr>");
> +MODULE_DESCRIPTION("HID multitouch panels");
> +MODULE_LICENSE("GPL");
> +
> +#include "hid-ids.h"
> +
> +/* quirks to control the device */
> +#define MT_QUIRK_NOT_SEEN_MEANS_UP	(1 << 0)
> +#define MT_QUIRK_SLOT_IS_CONTACTID	(1 << 1)
> +
> +struct mt_slot {
> +	__s32 x, y, p, w, h;
> +	__s32 contactid;	/* the device ContactID assigned to this slot */
> +	bool touch_state;	/* is the touch valid? */
> +	bool seen_in_this_frame;/* has this slot been updated */
> +};
> +
> +struct mt_device {
> +	struct mt_slot curdata;	/* placeholder of incoming data */
> +	struct mt_class *mtclass;	/* our mt device class */
> +	unsigned last_field_index;	/* last field index of the report */
> +	unsigned last_slot_field;	/* the last field of a slot */
> +	__s8 inputmode;		/* InputMode HID feature, -1 if non-existent */
> +	__u8 num_received;	/* how many contacts we received */
> +	__u8 num_expected;	/* expected last contact index */

Any particular reason these are u8?

> +	bool curvalid;		/* is the current contact valid? */
> +	struct mt_slot slots[0];	/* first slot */
> +};
> +
> +struct mt_class {
> +	__s32 quirks;
> +	__s32 sn_move;	/* Signal/noise ratio for move events */
> +	__s32 sn_pressure;	/* Signal/noise ratio for pressure events */
> +	__u8 maxcontacts;

Same here - its not like we allocate a million of these anyways. Simple ints should do fine.

> +};
> +
> +/* classes of device behavior */
> +#define MT_CLS_DEFAULT 0
> +#define MT_CLS_DUAL1 1
> +
> +/*
> + * these device-dependent functions determine what slot corresponds
> + * to a valid contact that was just read.
> + */
> +
> +static int slot_is_contactid(struct mt_device *td)
> +{
> +	return td->curdata.contactid;
> +}
> +
> +static int find_slot_from_contactid(struct mt_device *td)
> +{
> +	int i;
> +	for (i = 0; i < td->mtclass->maxcontacts; ++i) {
> +		if (td->slots[i].contactid == td->curdata.contactid &&
> +			td->slots[i].touch_state)
> +			return i;
> +	}
> +	for (i = 0; i < td->mtclass->maxcontacts; ++i) {
> +		if (!td->slots[i].seen_in_this_frame &&
> +			!td->slots[i].touch_state)
> +			return i;
> +	}
> +	return -1;
> +	/* should not occurs. If this happens that means
> +	 * that the device sent more touches that it says
> +	 * in the report descriptor. It is ignored then. */

I would put the comment above the return statement.

> +}
> +
> +struct mt_class mt_classes[] = {
> +	{ 0, 0, 0, 10 },                             /* MT_CLS_DEFAULT */
> +	{ MT_QUIRK_SLOT_IS_CONTACTID, 0, 0, 2 },     /* MT_CLS_DUAL1 */
> +};
> +
> +static void mt_feature_mapping(struct hid_device *hdev, struct hid_input *hi,
> +		struct hid_field *field, struct hid_usage *usage)
> +{
> +	if (usage->hid == HID_DG_INPUTMODE) {
> +		struct mt_device *td = hid_get_drvdata(hdev);
> +		td->inputmode = field->report->id;
> +	}
> +}
> +
> +static void set_abs(struct input_dev *input, unsigned int code,
> +		struct hid_field *field, int snratio)
> +{
> +	int fmin = field->logical_minimum;
> +	int fmax = field->logical_maximum;
> +	int fuzz = snratio ? (fmax - fmin) / snratio : 0;
> +	input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
> +}
> +
> +static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
> +		struct hid_field *field, struct hid_usage *usage,
> +		unsigned long **bit, int *max)
> +{
> +	struct mt_device *td = hid_get_drvdata(hdev);
> +	struct mt_class *cls = td->mtclass;
> +	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);
> +			set_abs(hi->input, ABS_MT_POSITION_X, field,
> +				cls->sn_move);
> +			/* touchscreen emulation */
> +			set_abs(hi->input, ABS_X, field, cls->sn_move);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_GD_Y:
> +			hid_map_usage(hi, usage, bit, max,
> +					EV_ABS, ABS_MT_POSITION_Y);
> +			set_abs(hi->input, ABS_MT_POSITION_Y, field,
> +				cls->sn_move);
> +			/* touchscreen emulation */
> +			set_abs(hi->input, ABS_Y, field, cls->sn_move);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		}
> +		return 0;
> +
> +	case HID_UP_DIGITIZER:
> +		switch (usage->hid) {
> +		case HID_DG_INRANGE:
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_CONFIDENCE:
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_TIPSWITCH:
> +			hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
> +			input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_CONTACTID:
> +			input_mt_init_slots(hi->input,
> +					td->mtclass->maxcontacts);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_WIDTH:
> +			hid_map_usage(hi, usage, bit, max,
> +					EV_ABS, ABS_MT_TOUCH_MAJOR);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_HEIGHT:
> +			hid_map_usage(hi, usage, bit, max,
> +					EV_ABS, ABS_MT_TOUCH_MINOR);
> +			field->logical_maximum = 1;
> +			field->logical_minimum = 1;

minimum should be zero here.

> +			set_abs(hi->input, ABS_MT_ORIENTATION, field, 0);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_TIPPRESSURE:
> +			hid_map_usage(hi, usage, bit, max,
> +					EV_ABS, ABS_MT_PRESSURE);
> +			set_abs(hi->input, ABS_MT_PRESSURE, field,
> +				cls->sn_pressure);
> +			/* touchscreen emulation */
> +			set_abs(hi->input, ABS_PRESSURE, field,
> +				cls->sn_pressure);
> +			td->last_slot_field = usage->hid;
> +			return 1;
> +		case HID_DG_CONTACTCOUNT:
> +			td->last_field_index = field->report->maxfield - 1;
> +			return 1;
> +		case HID_DG_CONTACTMAX:
> +			/* we don't set td->last_slot_field as contactcount and
> +			 * contact max are global to the report */
> +			return -1;
> +		}
> +		/* let hid-input decide for the others */
> +		return 0;
> +
> +	case 0xff000000:
> +		/* we do not want to map these: no input-oriented meaning */
> +		return -1;
> +	}
> +
> +	return 0;
> +}
> +
> +static int mt_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_ABS)
> +		set_bit(usage->type, hi->input->evbit);
> +
> +	return -1;
> +}
> +
> +static int mt_compute_slot(struct mt_device *td)
> +{
> +	struct mt_class *cls = td->mtclass;
> +
> +	if (cls->quirks & MT_QUIRK_SLOT_IS_CONTACTID)
> +		return slot_is_contactid(td);

No real need for a function call here...

> +
> +	return find_slot_from_contactid(td);
> +}
> +
> +/*
> + * this function is called when a whole contact has been processed,
> + * so that it can assign it to a slot and store the data there
> + */
> +static void mt_complete_slot(struct mt_device *td)
> +{

Adding "td->curdata.seen_in_this_frame = true;" here...

> +	if (td->curvalid) {
> +		struct mt_slot *slot;

Skipping this...

> +		int slotnum = mt_compute_slot(td);
> +
> +		if (slotnum >= 0 && slotnum < td->mtclass->maxcontacts) {
> +			slot = td->slots + slotnum;

and this...

> +
> +			memcpy(slot, &(td->curdata), sizeof(struct mt_slot));

and "td->slots[slotnum] = td->curdata" here...

> +			slot->seen_in_this_frame = true;

and dropping this... looks simpler, ne?

> +		}
> +	}
> +	td->num_received++;
> +}

Writing it explicitly here so you can judge for yourself:

	td->curdata.seen_in_this_frame = true;
	if (td->curvalid) {
		int slot = mt_compute_slot(td);

		if (slot >= 0 && slot < td->mtclass->maxcontacts)
			td->slots[slot] = td->curdata;
	}
	td->num_received++;

> +
> +
> +/*
> + * this function is called when a whole packet has been received and processed,
> + * so that it can decide what to send to the input layer.
> + */
> +static void mt_emit_event(struct mt_device *td, struct input_dev *input)
> +{
> +	int i;
> +
> +	for (i = 0; i < td->mtclass->maxcontacts; ++i) {
> +		struct mt_slot *s = &(td->slots[i]);
> +		if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
> +			!s->seen_in_this_frame) {
> +			/*
> +			 * this slot does not contain useful data,
> +			 * notify its closure
> +			 */

It does contain useful data, it is just assumed to be in the up
state. I would drop the comment and the brackets here, the quirk name
speaks for itself.

> +			s->touch_state = false;
> +		}
> +
> +		input_mt_slot(input, i);
> +		input_mt_report_slot_state(input, MT_TOOL_FINGER,
> +			s->touch_state);

The values below should not be updated for an inactive slot.

> +		input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
> +		input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
> +		input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
> +		input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w);
> +		input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
> +		s->seen_in_this_frame = false;
> +
> +	}
> +
> +	input_mt_report_pointer_emulation(input, true);
> +	input_sync(input);
> +	td->num_received = 0;
> +}
> +
> +
> +
> +static int mt_event(struct hid_device *hid, struct hid_field *field,
> +				struct hid_usage *usage, __s32 value)
> +{
> +	struct mt_device *td = hid_get_drvdata(hid);
> +
> +	if (hid->claimed & HID_CLAIMED_INPUT) {
> +		switch (usage->hid) {
> +		case HID_DG_INRANGE:
> +			break;
> +		case HID_DG_TIPSWITCH:
> +			td->curvalid = value;

I do not think curvalid should depend on the touch state (which is
what tipswitch is). Either move to INRANGE, or simply set to true.

> +			td->curdata.touch_state = value;
> +			break;
> +		case HID_DG_CONFIDENCE:
> +			break;
> +		case HID_DG_CONTACTID:
> +			td->curdata.contactid = value;
> +			break;
> +		case HID_DG_TIPPRESSURE:
> +			td->curdata.p = value;
> +			break;
> +		case HID_GD_X:
> +			td->curdata.x = value;
> +			break;
> +		case HID_GD_Y:
> +			td->curdata.y = value;
> +			break;
> +		case HID_DG_WIDTH:
> +			td->curdata.w = value;
> +			break;
> +		case HID_DG_HEIGHT:
> +			td->curdata.h = value;
> +			break;
> +		case HID_DG_CONTACTCOUNT:
> +			/*
> +			 * We must not overwrite the previous value (some
> +			 * devices send one sequence splitted over several
> +			 * messages)
> +			 */

How about "Includes multi-packet support where subsequent packets are sent with zero contactcount."

> +			if (value)
> +				td->num_expected = value - 1;

The - 1 should be dropped here.

> +			break;
> +
> +		default:
> +			/* fallback to the generic hidinput handling */
> +			return 0;
> +		}
> +	}
> +
> +	if (usage->hid == td->last_slot_field)
> +		mt_complete_slot(td);
> +
> +	if (field->index == td->last_field_index
> +		&& td->num_received > td->num_expected)

A ">=" here.

> +		mt_emit_event(td, field->hidinput->input);
> +
> +	/* 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 void mt_set_input_mode(struct hid_device *hdev)
> +{
> +	struct mt_device *td = hid_get_drvdata(hdev);
> +	struct hid_report *r;
> +	struct hid_report_enum *re;
> +
> +	if (td->inputmode < 0)
> +		return;
> +
> +	re = &(hdev->report_enum[HID_FEATURE_REPORT]);
> +	r = re->report_id_hash[td->inputmode];
> +	if (r) {
> +		r->field[0]->value[0] = 0x02;
> +		usbhid_submit_report(hdev, r, USB_DIR_OUT);
> +	}
> +}
> +
> +static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
> +{
> +	int ret;
> +	struct mt_device *td;
> +	struct mt_class *mtclass = mt_classes + id->driver_data;
> +
> +	/* This allows the driver to correctly support devices
> +	 * that emit events over several HID messages.
> +	 */
> +	hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
> +
> +	td = kzalloc(sizeof(struct mt_device) +
> +				mtclass->maxcontacts * sizeof(struct mt_slot),
> +				GFP_KERNEL);
> +	if (!td) {
> +		dev_err(&hdev->dev, "cannot allocate multitouch data\n");
> +		return -ENOMEM;
> +	}
> +	td->mtclass = mtclass;
> +	td->inputmode = -1;
> +	hid_set_drvdata(hdev, td);
> +
> +	ret = hid_parse(hdev);
> +	if (ret != 0)
> +		goto fail;

"if (ret)" is very standard.

> +
> +	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
> +	if (ret != 0)
> +		goto fail;
> +
> +	mt_set_input_mode(hdev);
> +
> +	return 0;
> +
> +fail:
> +	kfree(td);
> +	return ret;
> +}
> +
> +#ifdef CONFIG_PM
> +static int mt_reset_resume(struct hid_device *hdev)
> +{
> +	mt_set_input_mode(hdev);
> +	return 0;
> +}
> +#endif
> +
> +static void mt_remove(struct hid_device *hdev)
> +{
> +	struct mt_device *td = hid_get_drvdata(hdev);
> +	hid_hw_stop(hdev);
> +	kfree(td);
> +	hid_set_drvdata(hdev, NULL);
> +}
> +
> +static const struct hid_device_id mt_devices[] = {
> +
> +	/* PixCir-based panels */
> +	{ .driver_data = MT_CLS_DUAL1,
> +		HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
> +			USB_DEVICE_ID_HANVON_MULTITOUCH) },
> +	{ .driver_data = MT_CLS_DUAL1,
> +		HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
> +			USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
> +
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(hid, mt_devices);
> +
> +static const struct hid_usage_id mt_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 mt_driver = {
> +	.name = "hid-multitouch",
> +	.id_table = mt_devices,
> +	.probe = mt_probe,
> +	.remove = mt_remove,
> +	.input_mapping = mt_input_mapping,
> +	.input_mapped = mt_input_mapped,
> +	.feature_mapping = mt_feature_mapping,
> +	.usage_table = mt_grabbed_usages,
> +	.event = mt_event,
> +#ifdef CONFIG_PM
> +	.reset_resume = mt_reset_resume,
> +#endif
> +};
> +
> +static int __init mt_init(void)
> +{
> +	return hid_register_driver(&mt_driver);
> +}
> +
> +static void __exit mt_exit(void)
> +{
> +	hid_unregister_driver(&mt_driver);
> +}
> +
> +module_init(mt_init);
> +module_exit(mt_exit);
> -- 
> 1.7.3.4
> 

Thanks!
Henrik
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