Date:   Fri, 04 Nov 2016 15:49:44 +0100
From:   Bastien Nocera <hadess@...ess.net>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Kosina <jikos@...nel.org>
Subject: Re: [PATCH v1] HID: udraw: Add support for the uDraw tablet for PS3

On Fri, 2016-11-04 at 15:26 +0100, Benjamin Tissoires wrote:
> On Oct 27 2016 or thereabouts, Bastien Nocera wrote:
> > This adds support for the THQ uDraw tablet for the PS3, as
> > 4 separate device nodes, so that user-space can easily consume
> > events coming from the hardware.
> > 
> > Note that the touchpad two-finger support is fairly unreliable,
> > and a right-click can only be achieved with a two-finger tap
> > with the two fingers slightly apart (about 1cm should be enough).
> > 
> > Tested-by: Bastien Nocera <hadess@...ess.net>
> > Signed-off-by: Bastien Nocera <hadess@...ess.net>
> > ---
> >  MAINTAINERS             |   6 +
> >  drivers/hid/Kconfig     |   7 +
> >  drivers/hid/Makefile    |   1 +
> >  drivers/hid/hid-core.c  |   1 +
> >  drivers/hid/hid-ids.h   |   3 +
> >  drivers/hid/hid-udraw.c | 478
> > ++++++++++++++++++++++++++++++++++++++++++++++++
> >  6 files changed, 496 insertions(+)
> >  create mode 100644 drivers/hid/hid-udraw.c
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 33d7779..57f6bea 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -12197,6 +12197,12 @@ S:	Maintained
> >  F:	Documentation/filesystems/udf.txt
> >  F:	fs/udf/
> >  
> > +UDRAW TABLET
> > +M:	Bastien Nocera <hadess@...ess.net>
> > +L:	linux-input@...r.kernel.org
> > +S:	Maintained
> > +F:	drivers/hid/hid-udraw.c
> > +
> >  UFS FILESYSTEM
> >  M:	Evgeniy Dushistov <dushistov@...l.ru>
> >  S:	Maintained
> > diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> > index cd4599c..88c831e 100644
> > --- a/drivers/hid/Kconfig
> > +++ b/drivers/hid/Kconfig
> > @@ -861,6 +861,13 @@ config THRUSTMASTER_FF
> >  	  a THRUSTMASTER Dual Trigger 3-in-1 or a THRUSTMASTER
> > Ferrari
> > GT
> >  	  Rumble Force or Force Feedback Wheel.
> >  
> > +config HID_UDRAW
> > +	tristate "THQ PS3 uDraw tablet"
> > +	depends on HID
> > +	---help---
> > +	  Say Y here if you want to use the THQ uDraw gaming
> > tablet
> > for
> 
> Looks like your MUA corrupted the patch...

Yeah, I'll resend another way.

> > +	  the PS3.
> > +
> >  config HID_WACOM
> >  	tristate "Wacom Intuos/Graphire tablet support (USB)"
> >  	depends on HID
> > diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
> > index 86b2b57..d0d9b34 100644
> > --- a/drivers/hid/Makefile
> > +++ b/drivers/hid/Makefile
> > @@ -96,6 +96,7 @@ obj-$(CONFIG_HID_TIVO)		+= hid-
> > tivo.o
> >  obj-$(CONFIG_HID_TOPSEED)	+= hid-topseed.o
> >  obj-$(CONFIG_HID_TWINHAN)	+= hid-twinhan.o
> >  obj-$(CONFIG_HID_UCLOGIC)	+= hid-uclogic.o
> > +obj-$(CONFIG_HID_UDRAW)		+= hid-udraw.o
> >  obj-$(CONFIG_HID_LED)		+= hid-led.o
> >  obj-$(CONFIG_HID_XINMO)		+= hid-xinmo.o
> >  obj-$(CONFIG_HID_ZEROPLUS)	+= hid-zpff.o
> > diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> > index 2b89c70..3611ec7 100644
> > --- a/drivers/hid/hid-core.c
> > +++ b/drivers/hid/hid-core.c
> > @@ -2086,6 +2086,7 @@ static const struct hid_device_id
> > hid_have_special_driver[] = {
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
> > USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
> > USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
> > USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
> > +	{ HID_USB_DEVICE(USB_VENDOR_ID_THQ,
> > USB_DEVICE_ID_THQ_PS3_UDRAW) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
> > USB_DEVICE_ID_YIYNOVA_TABLET) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
> > USB_DEVICE_ID_UGEE_TABLET_81) },
> >  	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
> > USB_DEVICE_ID_UGEE_TABLET_45) },
> > diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> > index cd59c79..4ff9ecc 100644
> > --- a/drivers/hid/hid-ids.h
> > +++ b/drivers/hid/hid-ids.h
> > @@ -955,6 +955,9 @@
> >  #define USB_VENDOR_ID_THINGM		0x27b8
> >  #define USB_DEVICE_ID_BLINK1		0x01ed
> >  
> > +#define USB_VENDOR_ID_THQ		0x20d6
> > +#define USB_DEVICE_ID_THQ_PS3_UDRAW	0xcb17
> > +
> >  #define USB_VENDOR_ID_THRUSTMASTER	0x044f
> >  
> >  #define USB_VENDOR_ID_TIVO		0x150a
> > diff --git a/drivers/hid/hid-udraw.c b/drivers/hid/hid-udraw.c
> > new file mode 100644
> > index 0000000..794aae5
> > --- /dev/null
> > +++ b/drivers/hid/hid-udraw.c
> > @@ -0,0 +1,478 @@
> > +/*
> > + * HID driver for THQ PS3 uDraw tablet
> > + *
> > + * Copyright (C) 2016 Red Hat Inc. All Rights Reserved
> > + *
> > + * This software is licensed under the terms of the GNU General
> > Public
> > + * License version 2, as published by the Free Software
> > Foundation,
> > and
> > + * may be copied, distributed, and modified under those terms.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/hid.h>
> > +#include <linux/module.h>
> > +#include "hid-ids.h"
> > +
> > +MODULE_AUTHOR("Bastien Nocera <hadess@...ess.net>");
> > +MODULE_DESCRIPTION("PS3 uDraw tablet driver");
> > +MODULE_LICENSE("GPL");
> > +
> > +/*
> > + * Protocol information from:
> > + * http://brandonw.net/udraw/
> > + * and the source code of:
> > + * https://vvvv.org/contribution/udraw-hid
> > + */
> > +
> > +/*
> > + * The device is setup with multiple input devices to make it
> > easier
> > + * to handle in user-space:
> 
> That's also the correct way of doing it, given that this device is a
> set
> of distinct devices.

So should I remove or expand the comment?

> > + * - the touch area which works as a touchpad
> > + * - the tablet area which works as a touchpad/drawing tablet
> > + * - a joypad with a d-pad, and 7 buttons
> > + * - an accelerometer device
> > + */
> > +
> > +enum {
> > +	TOUCH_NONE,
> > +	TOUCH_PEN,
> > +	TOUCH_FINGER,
> > +	TOUCH_TWOFINGER
> > +};
> > +
> > +enum {
> > +	AXIS_X,
> > +	AXIS_Y,
> > +	AXIS_Z
> > +};
> > +
> > +/* Accelerometer min/max values
> > + * in order, X, Y and Z
> > + */
> > +struct {
> > +	int min;
> > +	int max;
> > +} accel_limits[] = {
> > +	[AXIS_X] = { 0x1EA, 0x216 },
> > +	[AXIS_Y] = { 0x1EA, 0x216 },
> > +	[AXIS_Z] = { 0x1EC, 0x218 }
> 
> Nitpicking, it feels weird writing min/max as hex values.

For this and most of the hex values below, I'm using hex values because
the various drivers I based this off used hex values. I can certainly
convert them all, but this would lose the direct searchability for
them. Just let me know which way I should go there.

> > +};
> > +
> > +#define DEVICE_NAME "THQ uDraw Game Tablet for PS3"
> > +/* resolution in pixels */
> > +#define RES_X 1920
> > +#define RES_Y 1080
> > +/* size in mm */
> > +#define WIDTH  160
> > +#define HEIGHT 90
> > +#define PRESSURE_OFFSET 0x71
> > +#define MAX_PRESSURE (0xFF - PRESSURE_OFFSET)
> 
> Why is pressure an hex value too?
> 
> > +
> > +struct udraw {
> > +	struct input_dev *joy_input_dev;
> > +	struct input_dev *touch_input_dev;
> > +	struct input_dev *pen_input_dev;
> > +	struct input_dev *accel_input_dev;
> > +	struct hid_device *hdev;
> > +
> > +	/* The device's two-finger support is pretty unreliable,
> > as
> 
> Nitpicking, the kernel comment style requires to have the following:
> /*
>  * foo
>  * bar
>  */

I'll fix that.

> > +	 * the device could report a single touch when the two
> > fingers
> > +	 * are too close together, and the distance between
> > fingers,
> > even
> > +	 * though reported is not in pixels, but in an arbitrary
> > unit.
> 
> There is no point in mentioning pixels here. All touchpads report
> their
> values in arbitrary units, which is then converted into unit per mm
> by
> using the resolution.

OK.

> > +	 *
> > +	 * We'll make do without it, and try to report the first
> > touch
> > +	 * as reliably as possible.
> > +	 */
> > +	int last_one_finger_x;
> > +	int last_one_finger_y;
> > +	int last_two_finger_x;
> > +	int last_two_finger_y;
> > +};
> > +
> > +static int clamp_accel(int axis, int offset)
> > +{
> > +	axis = clamp(axis,
> > +			accel_limits[offset].min,
> > +			accel_limits[offset].max);
> > +	axis = (axis - accel_limits[offset].min) /
> > +			((accel_limits[offset].max -
> > +			  accel_limits[offset].min) * 0xFF);
> > +	return axis;
> > +}
> > +
> > +static int udraw_raw_event(struct hid_device *hdev, struct
> > hid_report
> > *report,
> > +	 u8 *data, int len)
> > +{
> > +	struct udraw *udraw = hid_get_drvdata(hdev);
> > +	int touch;
> > +	int x, y, z;
> > +
> > +	if (len != 0x1B)
> 
> a length should not been expressed in hex.
> 
> > +		return 0;
> > +
> > +	if (data[11] == 0x00)
> > +		touch = TOUCH_NONE;
> > +	else if (data[11] == 0x40)
> > +		touch = TOUCH_PEN;
> > +	else if (data[11] == 0x80)
> > +		touch = TOUCH_FINGER;
> > +	else
> > +		touch = TOUCH_TWOFINGER;
> > +
> > +	/* joypad */
> > +	input_report_key(udraw->joy_input_dev, BTN_WEST, data[0] &
> > 1);
> > +	input_report_key(udraw->joy_input_dev, BTN_SOUTH, data[0]
> > &
> > 2);
> 
> you should report !!(data[0] & 2), or you'll send key repeat events
> to
> user space.

Noted.

> > +	input_report_key(udraw->joy_input_dev, BTN_EAST, data[0] &
> > 4);
> > +	input_report_key(udraw->joy_input_dev, BTN_NORTH, data[0]
> > &
> > 8);
> 
> Same for those 2, keys should be reported with a value of 0 or 1.
> 
> > +
> > +	input_report_key(udraw->joy_input_dev, BTN_SELECT, data[1]
> > &
> > 1);
> > +	input_report_key(udraw->joy_input_dev, BTN_START, data[1]
> > &
> > 2);
> > +	input_report_key(udraw->joy_input_dev, BTN_MODE, data[1] &
> > 16);
> 
> rinse, wash, repeat
> 
> > +
> > +	x = y = 0;
> > +	switch (data[2]) {
> > +	case 0x0:
> > +		y = -127;
> > +		break;
> > +	case 0x1:
> > +		y = -127;
> > +		x = 127;
> > +		break;
> > +	case 0x2:
> > +		x = 127;
> > +		break;
> > +	case 0x3:
> > +		y = 127;
> > +		x = 127;
> > +		break;
> > +	case 0x4:
> > +		y = 127;
> > +		break;
> > +	case 0x5:
> > +		y = 127;
> > +		x = -127;
> > +		break;
> > +	case 0x6:
> > +		x = -127;
> > +		break;
> > +	case 0x7:
> > +		y = -127;
> > +		x = -127;
> > +		break;
> > +	default:
> > +		break;
> > +	}
> > +
> > +	input_report_abs(udraw->joy_input_dev, ABS_X, x);
> > +	input_report_abs(udraw->joy_input_dev, ABS_Y, y);
> > +
> > +	input_sync(udraw->joy_input_dev);
> > +
> > +	/* For pen and touchpad */
> > +	x = y = 0;
> > +	if (touch != TOUCH_NONE) {
> > +		if (data[15] != 0x0F)
> > +			x = data[15] * 256 + data[17];
> > +		if (data[16] != 0x0F)
> > +			y = data[16] * 256 + data[18];
> > +	}
> > +
> > +	if (touch == TOUCH_FINGER) {
> > +		/* Save the last one-finger touch */
> > +		udraw->last_one_finger_x = x;
> > +		udraw->last_one_finger_y = y;
> > +		udraw->last_two_finger_x = -1;
> > +		udraw->last_two_finger_y = -1;
> > +	} else if (touch == TOUCH_TWOFINGER) {
> > +		/* We have a problem because x/y is the one for
> > the
> 
> comment style please (though IIRC, Jiri doesn't care much).
> 
> > +		 * second finger but we want the first finger
> > given
> > +		 * to user-space otherwise it'll look as if it
> > jumped.
> > +		 */
> > +		if (udraw->last_two_finger_x == -1) {
> > +			/* Save the position of the 2nd finger */
> > +			udraw->last_two_finger_x = x;
> > +			udraw->last_two_finger_y = y;
> > +
> > +			x = udraw->last_one_finger_x;
> > +			y = udraw->last_one_finger_y;
> > +		} else {
> > +			/* Offset the 2-finger coords using the
> > +			 * saved data from the first finger
> > +			 */
> > +			x = x - (udraw->last_two_finger_x
> > +				- udraw->last_one_finger_x);
> > +			y = y - (udraw->last_two_finger_y
> > +				- udraw->last_one_finger_y);
> > +		}
> 
> This way of reporting the fingers is terrible. However, Bastien asked
> for some early reviews and this was the most acceptable solution.

Should I add a longer comment there?

> > +	}
> > +
> > +	/* touchpad */
> > +	if (touch == TOUCH_FINGER || touch == TOUCH_TWOFINGER) {
> > +		input_report_key(udraw->touch_input_dev,
> > BTN_TOUCH,
> > 1);
> > +		input_report_key(udraw->touch_input_dev,
> > BTN_TOOL_FINGER,
> > +				touch == TOUCH_FINGER);
> > +		input_report_key(udraw->touch_input_dev,
> > BTN_TOOL_DOUBLETAP,
> > +				touch == TOUCH_TWOFINGER);
> > +
> > +		input_report_abs(udraw->touch_input_dev, ABS_X,
> > x);
> > +		input_report_abs(udraw->touch_input_dev, ABS_Y,
> > y);
> > +	} else {
> > +		input_report_key(udraw->touch_input_dev,
> > BTN_TOUCH,
> > 0);
> > +		input_report_key(udraw->touch_input_dev,
> > BTN_TOOL_FINGER, 0);
> > +		input_report_key(udraw->touch_input_dev,
> > BTN_TOOL_DOUBLETAP, 0);
> > +	}
> > +	input_sync(udraw->touch_input_dev);
> > +
> > +	/* pen */
> > +	if (touch == TOUCH_PEN) {
> > +		int level;
> > +
> > +		level = clamp(data[13] - PRESSURE_OFFSET,
> > +				0, MAX_PRESSURE);
> > +
> > +		input_report_key(udraw->pen_input_dev, BTN_TOUCH,
> > (level != 0));
> > +		input_report_key(udraw->pen_input_dev,
> > BTN_TOOL_PEN,
> > 1);
> > +		input_report_abs(udraw->pen_input_dev,
> > ABS_PRESSURE,
> > level);
> > +		input_report_abs(udraw->pen_input_dev, ABS_X, x);
> > +		input_report_abs(udraw->pen_input_dev, ABS_Y, y);
> > +	} else {
> > +		input_report_key(udraw->pen_input_dev, BTN_TOUCH,
> > 0);
> > +		input_report_key(udraw->pen_input_dev,
> > BTN_TOOL_PEN,
> > 0);
> > +		input_report_abs(udraw->pen_input_dev,
> > ABS_PRESSURE,
> > 0);
> > +	}
> > +	input_sync(udraw->pen_input_dev);
> > +
> > +	/* accel */
> > +	x = (data[19] + (data[20] << 8));
> > +	x = clamp_accel(x, AXIS_X);
> > +	y = (data[21] + (data[22] << 8));
> > +	y = clamp_accel(y, AXIS_Y);
> > +	z = (data[23] + (data[24] << 8));
> > +	z = clamp_accel(z, AXIS_Z);
> > +	input_report_abs(udraw->accel_input_dev, ABS_X, x);
> > +	input_report_abs(udraw->accel_input_dev, ABS_Y, y);
> > +	input_report_abs(udraw->accel_input_dev, ABS_Z, z);
> > +	input_sync(udraw->accel_input_dev);
> > +
> > +	/* let hidraw and hiddev handle the report */
> > +	return 0;
> > +}
> > +
> > +static int udraw_open(struct input_dev *dev)
> > +{
> > +	struct udraw *udraw = input_get_drvdata(dev);
> > +
> > +	return hid_hw_open(udraw->hdev);
> > +}
> > +
> > +static void udraw_close(struct input_dev *dev)
> > +{
> > +	struct udraw *udraw = input_get_drvdata(dev);
> > +
> > +	hid_hw_close(udraw->hdev);
> > +}
> > +
> > +static struct input_dev *allocate_and_setup(struct hid_device
> > *hdev,
> > +		const char *name)
> > +{
> > +	struct input_dev *input_dev;
> > +
> > +	input_dev = devm_input_allocate_device(&hdev->dev);
> > +	if (!input_dev)
> > +		return NULL;
> > +
> > +	input_dev->name = name;
> > +	input_dev->phys = hdev->phys;
> > +	input_dev->dev.parent = &hdev->dev;
> > +	input_dev->open = udraw_open;
> > +	input_dev->close = udraw_close;
> > +	input_dev->uniq = hdev->uniq;
> > +	input_dev->id.bustype = hdev->bus;
> > +	input_dev->id.vendor  = hdev->vendor;
> > +	input_dev->id.product = hdev->product;
> > +	input_dev->id.version = hdev->version;
> > +	input_set_drvdata(input_dev, hid_get_drvdata(hdev));
> > +
> > +	return input_dev;
> > +}
> > +
> > +static bool udraw_setup_touch(struct udraw *udraw,
> > +		struct hid_device *hdev)
> > +{
> > +	struct input_dev *input_dev;
> > +
> > +	input_dev = allocate_and_setup(hdev, DEVICE_NAME "
> > Touchpad");
> > +	if (!input_dev)
> > +		return false;
> > +
> > +	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
> > +
> > +	set_bit(ABS_X, input_dev->absbit);
> 
> No need to set this, it will be set by input_set_abs_params()

Noted.

> > +	input_set_abs_params(input_dev, ABS_X, 0, RES_X, 1, 0);
> > +	input_abs_set_res(input_dev, ABS_X, RES_X / WIDTH);
> > +	set_bit(ABS_Y, input_dev->absbit);
> 
> likewise
> 
> > +	input_set_abs_params(input_dev, ABS_Y, 0, RES_Y, 1, 0);
> > +	input_abs_set_res(input_dev, ABS_Y, RES_Y / HEIGHT);
> > +
> > +	set_bit(BTN_TOUCH, input_dev->keybit);
> > +	set_bit(BTN_TOOL_FINGER, input_dev->keybit);
> > +	set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
> > +
> > +	set_bit(INPUT_PROP_POINTER, input_dev->propbit);
> > +
> > +	udraw->touch_input_dev = input_dev;
> > +
> > +	return true;
> > +}
> > +
> > +static bool udraw_setup_pen(struct udraw *udraw,
> > +		struct hid_device *hdev)
> > +{
> > +	struct input_dev *input_dev;
> > +
> > +	input_dev = allocate_and_setup(hdev, DEVICE_NAME " Pen");
> > +	if (!input_dev)
> > +		return false;
> > +
> > +	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
> > +
> > +	set_bit(ABS_X, input_dev->absbit);
> 
> no need to set this
> 
> > +	input_set_abs_params(input_dev, ABS_X, 0, RES_X, 1, 0);
> > +	input_abs_set_res(input_dev, ABS_X, RES_X / WIDTH);
> > +	set_bit(ABS_Y, input_dev->absbit);
> 
> idem
> 
> > +	input_set_abs_params(input_dev, ABS_Y, 0, RES_Y, 1, 0);
> > +	input_abs_set_res(input_dev, ABS_Y, RES_Y / HEIGHT);
> > +	set_bit(ABS_PRESSURE, input_dev->absbit);
> 
> idem
> 
> > +	input_set_abs_params(input_dev, ABS_PRESSURE,
> > +			0, MAX_PRESSURE, 0, 0);
> > +
> > +	set_bit(BTN_TOUCH, input_dev->keybit);
> > +	set_bit(BTN_TOOL_PEN, input_dev->keybit);
> > +
> > +	set_bit(INPUT_PROP_POINTER, input_dev->propbit);
> > +
> > +	udraw->pen_input_dev = input_dev;
> > +
> > +	return true;
> > +}
> > +
> > +static bool udraw_setup_accel(struct udraw *udraw,
> > +		struct hid_device *hdev)
> > +{
> > +	struct input_dev *input_dev;
> > +
> > +	input_dev = allocate_and_setup(hdev, DEVICE_NAME "
> > Accelerometer");
> > +	if (!input_dev)
> > +		return false;
> > +
> > +	input_dev->evbit[0] = BIT(EV_ABS);
> > +
> > +	/* 1G accel is reported as ~256, so clamp to 2G */
> > +	set_bit(ABS_X, input_dev->absbit);
> 
> no need to set this
> 
> > +	input_set_abs_params(input_dev, ABS_X, -512, 512, 0, 0);
> > +	set_bit(ABS_Y, input_dev->absbit);
> 
> idem
> 
> > +	input_set_abs_params(input_dev, ABS_Y, -512, 512, 0, 0);
> > +	set_bit(ABS_Z, input_dev->absbit);
> 
> idem
> 
> > +	input_set_abs_params(input_dev, ABS_Z, -512, 512, 0, 0);
> > +
> > +	set_bit(INPUT_PROP_ACCELEROMETER, input_dev->propbit);
> > +
> > +	udraw->accel_input_dev = input_dev;
> > +
> > +	return true;
> > +}
> > +
> > +static bool udraw_setup_joypad(struct udraw *udraw,
> > +		struct hid_device *hdev)
> > +{
> > +	struct input_dev *input_dev;
> > +
> > +	input_dev = allocate_and_setup(hdev, DEVICE_NAME "
> > Joypad");
> > +	if (!input_dev)
> > +		return false;
> > +
> > +	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
> > +
> > +	set_bit(BTN_SOUTH, input_dev->keybit);
> > +	set_bit(BTN_NORTH, input_dev->keybit);
> > +	set_bit(BTN_EAST, input_dev->keybit);
> > +	set_bit(BTN_WEST, input_dev->keybit);
> > +	set_bit(BTN_SELECT, input_dev->keybit);
> > +	set_bit(BTN_START, input_dev->keybit);
> > +	set_bit(BTN_MODE, input_dev->keybit);
> > +
> > +	set_bit(ABS_X, input_dev->absbit);
> 
> no need to set this
> 
> > +	input_set_abs_params(input_dev, ABS_X, -127, 127, 0, 0);
> > +	set_bit(ABS_Y, input_dev->absbit);
> 
> idem
> 
> > +	input_set_abs_params(input_dev, ABS_Y, -127, 127, 0, 0);
> > +
> > +	udraw->joy_input_dev = input_dev;
> > +
> > +	return true;
> > +}
> > +
> > +static int udraw_probe(struct hid_device *hdev, const struct
> > hid_device_id *id)
> > +{
> > +	struct udraw *udraw;
> > +	int ret;
> > +
> > +	udraw = devm_kzalloc(&hdev->dev, sizeof(struct udraw),
> > GFP_KERNEL);
> > +	if (!udraw)
> > +		return -ENOMEM;
> > +
> > +	udraw->hdev = hdev;
> > +	udraw->last_two_finger_x = -1;
> > +	udraw->last_two_finger_y = -1;
> > +
> > +	hid_set_drvdata(hdev, udraw);
> > +
> > +	ret = hid_parse(hdev);
> > +	if (ret) {
> > +		hid_err(hdev, "parse failed\n");
> > +		return ret;
> > +	}
> > +
> > +	if (!udraw_setup_joypad(udraw, hdev) ||
> > +	    !udraw_setup_touch(udraw, hdev) ||
> > +	    !udraw_setup_pen(udraw, hdev) ||
> > +	    !udraw_setup_accel(udraw, hdev)) {
> > +		hid_err(hdev, "could not allocate interfaces\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	ret = input_register_device(udraw->joy_input_dev) ||
> > +		input_register_device(udraw->touch_input_dev) ||
> > +		input_register_device(udraw->pen_input_dev) ||
> > +		input_register_device(udraw->accel_input_dev);
> > +	if (ret) {
> > +		hid_err(hdev, "failed to register interfaces\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW |
> > HID_CONNECT_DRIVER);
> > +	if (ret) {
> > +		hid_err(hdev, "hw start failed\n");
> > +		return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct hid_device_id udraw_devices[] = {
> > +	{ HID_USB_DEVICE(USB_VENDOR_ID_THQ,
> > USB_DEVICE_ID_THQ_PS3_UDRAW) },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(hid, udraw_devices);
> > +
> > +static struct hid_driver udraw_driver = {
> > +	.name = "hid-udraw",
> > +	.id_table = udraw_devices,
> > +	.raw_event = udraw_raw_event,
> > +	.probe = udraw_probe,
> > +};
> > +module_hid_driver(udraw_driver);
> > -- 
> > 2.7.4
> 
> Cheers,
> Benjamin
> 

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