drivers/usb/input/touchkitusb.c - linux - Git at Google

 /******************************************************************************
  * touchkitusb.c  --  Driver for eGalax TouchKit USB Touchscreens
  *
  * Copyright (C) 2004-2005 by Daniel Ritz <daniel.ritz@gmx.ch>
  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
  *
  * 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.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Based upon mtouchusb.c
  *
  *****************************************************************************/

 //#define DEBUG

 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/usb/input.h>

 #define TOUCHKIT_MIN_XC			0x0
 #define TOUCHKIT_MAX_XC			0x07ff
 #define TOUCHKIT_XC_FUZZ		0x0
 #define TOUCHKIT_XC_FLAT		0x0
 #define TOUCHKIT_MIN_YC			0x0
 #define TOUCHKIT_MAX_YC			0x07ff
 #define TOUCHKIT_YC_FUZZ		0x0
 #define TOUCHKIT_YC_FLAT		0x0
 #define TOUCHKIT_REPORT_DATA_SIZE	16

 #define TOUCHKIT_DOWN			0x01

 #define TOUCHKIT_PKT_TYPE_MASK		0xFE
 #define TOUCHKIT_PKT_TYPE_REPT		0x80
 #define TOUCHKIT_PKT_TYPE_DIAG		0x0A

 #define DRIVER_VERSION			"v0.1"
 #define DRIVER_AUTHOR			"Daniel Ritz <daniel.ritz@gmx.ch>"
 #define DRIVER_DESC			"eGalax TouchKit USB HID Touchscreen Driver"

 static int swap_xy;
 module_param(swap_xy, bool, 0644);
 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");

 struct touchkit_usb {
 	unsigned char *data;
 	dma_addr_t data_dma;
 	char buffer[TOUCHKIT_REPORT_DATA_SIZE];
 	int buf_len;
 	struct urb *irq;
 	struct usb_device *udev;
 	struct input_dev *input;
 	char name[128];
 	char phys[64];
 };

 static struct usb_device_id touchkit_devices[] = {
 	{USB_DEVICE(0x3823, 0x0001)},
 	{USB_DEVICE(0x0123, 0x0001)},
 	{USB_DEVICE(0x0eef, 0x0001)},
 	{USB_DEVICE(0x0eef, 0x0002)},
 	{}
 };

 /* helpers to read the data */
 static inline int touchkit_get_touched(char *data)
 {
 	return (data[0] & TOUCHKIT_DOWN) ? 1 : 0;
 }

 static inline int touchkit_get_x(char *data)
 {
 	return ((data[3] & 0x0F) << 7) | (data[4] & 0x7F);
 }

 static inline int touchkit_get_y(char *data)
 {
 	return ((data[1] & 0x0F) << 7) | (data[2] & 0x7F);
 }


 /* processes one input packet. */
 static void touchkit_process_pkt(struct touchkit_usb *touchkit,
                                  struct pt_regs *regs, char *pkt)
 {
 	int x, y;

 	/* only process report packets */
 	if ((pkt[0] & TOUCHKIT_PKT_TYPE_MASK) != TOUCHKIT_PKT_TYPE_REPT)
 		return;

 	if (swap_xy) {
 		y = touchkit_get_x(pkt);
 		x = touchkit_get_y(pkt);
 	} else {
 		x = touchkit_get_x(pkt);
 		y = touchkit_get_y(pkt);
 	}

 	input_regs(touchkit->input, regs);
 	input_report_key(touchkit->input, BTN_TOUCH, touchkit_get_touched(pkt));
 	input_report_abs(touchkit->input, ABS_X, x);
 	input_report_abs(touchkit->input, ABS_Y, y);
 	input_sync(touchkit->input);
 }


 static int touchkit_get_pkt_len(char *buf)
 {
 	switch (buf[0] & TOUCHKIT_PKT_TYPE_MASK) {
 	case TOUCHKIT_PKT_TYPE_REPT:
 		return 5;

 	case TOUCHKIT_PKT_TYPE_DIAG:
 		return buf[1] + 2;
 	}

 	return 0;
 }

 static void touchkit_process(struct touchkit_usb *touchkit, int len,
                              struct pt_regs *regs)
 {
 	char *buffer;
 	int pkt_len, buf_len, pos;

 	/* if the buffer contains data, append */
 	if (unlikely(touchkit->buf_len)) {
 		int tmp;

 		/* if only 1 byte in buffer, add another one to get length */
 		if (touchkit->buf_len == 1)
 			touchkit->buffer[1] = touchkit->data[0];

 		pkt_len = touchkit_get_pkt_len(touchkit->buffer);

 		/* unknown packet: drop everything */
 		if (!pkt_len)
 			return;

 		/* append, process */
 		tmp = pkt_len - touchkit->buf_len;
 		memcpy(touchkit->buffer + touchkit->buf_len, touchkit->data, tmp);
 		touchkit_process_pkt(touchkit, regs, touchkit->buffer);

 		buffer = touchkit->data + tmp;
 		buf_len = len - tmp;
 	} else {
 		buffer = touchkit->data;
 		buf_len = len;
 	}

 	/* only one byte left in buffer */
 	if (unlikely(buf_len == 1)) {
 		touchkit->buffer[0] = buffer[0];
 		touchkit->buf_len = 1;
 		return;
 	}

 	/* loop over the buffer */
 	pos = 0;
 	while (pos < buf_len) {
 		/* get packet len */
 		pkt_len = touchkit_get_pkt_len(buffer + pos);

 		/* unknown packet: drop everything */
 		if (unlikely(!pkt_len))
 			return;

 		/* full packet: process */
 		if (likely(pkt_len <= buf_len)) {
 			touchkit_process_pkt(touchkit, regs, buffer + pos);
 		} else {
 			/* incomplete packet: save in buffer */
 			memcpy(touchkit->buffer, buffer + pos, buf_len - pos);
 			touchkit->buf_len = buf_len - pos;
 		}
 		pos += pkt_len;
 	}
 }


 static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
 {
 	struct touchkit_usb *touchkit = urb->context;
 	int retval;

 	switch (urb->status) {
 	case 0:
 		/* success */
 		break;
 	case -ETIMEDOUT:
 		/* this urb is timing out */
 		dbg("%s - urb timed out - was the device unplugged?",
 		    __FUNCTION__);
 		return;
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:
 		/* this urb is terminated, clean up */
 		dbg("%s - urb shutting down with status: %d",
 		    __FUNCTION__, urb->status);
 		return;
 	default:
 		dbg("%s - nonzero urb status received: %d",
 		    __FUNCTION__, urb->status);
 		goto exit;
 	}

 	touchkit_process(touchkit, urb->actual_length, regs);

 exit:
 	retval = usb_submit_urb(urb, GFP_ATOMIC);
 	if (retval)
 		err("%s - usb_submit_urb failed with result: %d",
 		    __FUNCTION__, retval);
 }

 static int touchkit_open(struct input_dev *input)
 {
 	struct touchkit_usb *touchkit = input->private;

 	touchkit->irq->dev = touchkit->udev;

 	if (usb_submit_urb(touchkit->irq, GFP_ATOMIC))
 		return -EIO;

 	return 0;
 }

 static void touchkit_close(struct input_dev *input)
 {
 	struct touchkit_usb *touchkit = input->private;

 	usb_kill_urb(touchkit->irq);
 }

 static int touchkit_alloc_buffers(struct usb_device *udev,
 				  struct touchkit_usb *touchkit)
 {
 	touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
 	                                  SLAB_ATOMIC, &touchkit->data_dma);

 	if (!touchkit->data)
 		return -1;

 	return 0;
 }

 static void touchkit_free_buffers(struct usb_device *udev,
 				  struct touchkit_usb *touchkit)
 {
 	if (touchkit->data)
 		usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
 		                touchkit->data, touchkit->data_dma);
 }

 static int touchkit_probe(struct usb_interface *intf,
 			  const struct usb_device_id *id)
 {
 	struct touchkit_usb *touchkit;
 	struct input_dev *input_dev;
 	struct usb_host_interface *interface;
 	struct usb_endpoint_descriptor *endpoint;
 	struct usb_device *udev = interface_to_usbdev(intf);

 	interface = intf->cur_altsetting;
 	endpoint = &interface->endpoint[0].desc;

 	touchkit = kzalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!touchkit || !input_dev)
 		goto out_free;

 	if (touchkit_alloc_buffers(udev, touchkit))
 		goto out_free;

 	touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
 	if (!touchkit->irq) {
 		dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
 		goto out_free_buffers;
 	}

 	touchkit->udev = udev;
 	touchkit->input = input_dev;

 	if (udev->manufacturer)
 		strlcpy(touchkit->name, udev->manufacturer, sizeof(touchkit->name));

 	if (udev->product) {
 		if (udev->manufacturer)
 			strlcat(touchkit->name, " ", sizeof(touchkit->name));
 		strlcat(touchkit->name, udev->product, sizeof(touchkit->name));
 	}

 	if (!strlen(touchkit->name))
 		snprintf(touchkit->name, sizeof(touchkit->name),
 			"USB Touchscreen %04x:%04x",
 			 le16_to_cpu(udev->descriptor.idVendor),
 			 le16_to_cpu(udev->descriptor.idProduct));

 	usb_make_path(udev, touchkit->phys, sizeof(touchkit->phys));
 	strlcpy(touchkit->phys, "/input0", sizeof(touchkit->phys));

 	input_dev->name = touchkit->name;
 	input_dev->phys = touchkit->phys;
 	usb_to_input_id(udev, &input_dev->id);
 	input_dev->cdev.dev = &intf->dev;
 	input_dev->private = touchkit;
 	input_dev->open = touchkit_open;
 	input_dev->close = touchkit_close;

 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 	input_set_abs_params(input_dev, ABS_X, TOUCHKIT_MIN_XC, TOUCHKIT_MAX_XC,
 				TOUCHKIT_XC_FUZZ, TOUCHKIT_XC_FLAT);
 	input_set_abs_params(input_dev, ABS_Y, TOUCHKIT_MIN_YC, TOUCHKIT_MAX_YC,
 				TOUCHKIT_YC_FUZZ, TOUCHKIT_YC_FLAT);

 	usb_fill_int_urb(touchkit->irq, touchkit->udev,
 			 usb_rcvintpipe(touchkit->udev, 0x81),
 			 touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
 			 touchkit_irq, touchkit, endpoint->bInterval);

 	touchkit->irq->transfer_dma = touchkit->data_dma;
 	touchkit->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

 	input_register_device(touchkit->input);

 	usb_set_intfdata(intf, touchkit);
 	return 0;

 out_free_buffers:
 	touchkit_free_buffers(udev, touchkit);
 out_free:
 	input_free_device(input_dev);
 	kfree(touchkit);
 	return -ENOMEM;
 }

 static void touchkit_disconnect(struct usb_interface *intf)
 {
 	struct touchkit_usb *touchkit = usb_get_intfdata(intf);

 	dbg("%s - called", __FUNCTION__);

 	if (!touchkit)
 		return;

 	dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
 	usb_set_intfdata(intf, NULL);
 	usb_kill_urb(touchkit->irq);
 	input_unregister_device(touchkit->input);
 	usb_free_urb(touchkit->irq);
 	touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
 	kfree(touchkit);
 }

 MODULE_DEVICE_TABLE(usb, touchkit_devices);

 static struct usb_driver touchkit_driver = {
 	.name		= "touchkitusb",
 	.probe		= touchkit_probe,
 	.disconnect	= touchkit_disconnect,
 	.id_table	= touchkit_devices,
 };

 static int __init touchkit_init(void)
 {
 	return usb_register(&touchkit_driver);
 }

 static void __exit touchkit_cleanup(void)
 {
 	usb_deregister(&touchkit_driver);
 }

 module_init(touchkit_init);
 module_exit(touchkit_cleanup);

 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
	/******************************************************************************
	* touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
	*
	* Copyright (C) 2004-2005 by Daniel Ritz <daniel.ritz@gmx.ch>
	* Copyright (C) by Todd E. Johnson (mtouchusb.c)
	*
	* 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.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* Based upon mtouchusb.c
	*
	*****************************************************************************/

	//#define DEBUG

	#include <linux/config.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/usb/input.h>

	#define TOUCHKIT_MIN_XC 0x0
	#define TOUCHKIT_MAX_XC 0x07ff
	#define TOUCHKIT_XC_FUZZ 0x0
	#define TOUCHKIT_XC_FLAT 0x0
	#define TOUCHKIT_MIN_YC 0x0
	#define TOUCHKIT_MAX_YC 0x07ff
	#define TOUCHKIT_YC_FUZZ 0x0
	#define TOUCHKIT_YC_FLAT 0x0
	#define TOUCHKIT_REPORT_DATA_SIZE 16

	#define TOUCHKIT_DOWN 0x01

	#define TOUCHKIT_PKT_TYPE_MASK 0xFE
	#define TOUCHKIT_PKT_TYPE_REPT 0x80
	#define TOUCHKIT_PKT_TYPE_DIAG 0x0A

	#define DRIVER_VERSION "v0.1"
	#define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@gmx.ch>"
	#define DRIVER_DESC "eGalax TouchKit USB HID Touchscreen Driver"

	static int swap_xy;
	module_param(swap_xy, bool, 0644);
	MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");

	struct touchkit_usb {
	unsigned char *data;
	dma_addr_t data_dma;
	char buffer[TOUCHKIT_REPORT_DATA_SIZE];
	int buf_len;
	struct urb *irq;
	struct usb_device *udev;
	struct input_dev *input;
	char name[128];
	char phys[64];
	};

	static struct usb_device_id touchkit_devices[] = {
	{USB_DEVICE(0x3823, 0x0001)},
	{USB_DEVICE(0x0123, 0x0001)},
	{USB_DEVICE(0x0eef, 0x0001)},
	{USB_DEVICE(0x0eef, 0x0002)},
	{}
	};

	/* helpers to read the data */
	static inline int touchkit_get_touched(char *data)
	{
	return (data[0] & TOUCHKIT_DOWN) ? 1 : 0;
	}

	static inline int touchkit_get_x(char *data)
	{
	return ((data[3] & 0x0F) << 7) \| (data[4] & 0x7F);
	}

	static inline int touchkit_get_y(char *data)
	{
	return ((data[1] & 0x0F) << 7) \| (data[2] & 0x7F);
	}


	/* processes one input packet. */
	static void touchkit_process_pkt(struct touchkit_usb *touchkit,
	struct pt_regs regs, char pkt)
	{
	int x, y;

	/* only process report packets */
	if ((pkt[0] & TOUCHKIT_PKT_TYPE_MASK) != TOUCHKIT_PKT_TYPE_REPT)
	return;

	if (swap_xy) {
	y = touchkit_get_x(pkt);
	x = touchkit_get_y(pkt);
	} else {
	x = touchkit_get_x(pkt);
	y = touchkit_get_y(pkt);
	}

	input_regs(touchkit->input, regs);
	input_report_key(touchkit->input, BTN_TOUCH, touchkit_get_touched(pkt));
	input_report_abs(touchkit->input, ABS_X, x);
	input_report_abs(touchkit->input, ABS_Y, y);
	input_sync(touchkit->input);
	}


	static int touchkit_get_pkt_len(char *buf)
	{
	switch (buf[0] & TOUCHKIT_PKT_TYPE_MASK) {
	case TOUCHKIT_PKT_TYPE_REPT:
	return 5;

	case TOUCHKIT_PKT_TYPE_DIAG:
	return buf[1] + 2;
	}

	return 0;
	}

	static void touchkit_process(struct touchkit_usb *touchkit, int len,
	struct pt_regs *regs)
	{
	char *buffer;
	int pkt_len, buf_len, pos;

	/* if the buffer contains data, append */
	if (unlikely(touchkit->buf_len)) {
	int tmp;

	/* if only 1 byte in buffer, add another one to get length */
	if (touchkit->buf_len == 1)
	touchkit->buffer[1] = touchkit->data[0];

	pkt_len = touchkit_get_pkt_len(touchkit->buffer);

	/* unknown packet: drop everything */
	if (!pkt_len)
	return;

	/* append, process */
	tmp = pkt_len - touchkit->buf_len;
	memcpy(touchkit->buffer + touchkit->buf_len, touchkit->data, tmp);
	touchkit_process_pkt(touchkit, regs, touchkit->buffer);

	buffer = touchkit->data + tmp;
	buf_len = len - tmp;
	} else {
	buffer = touchkit->data;
	buf_len = len;
	}

	/* only one byte left in buffer */
	if (unlikely(buf_len == 1)) {
	touchkit->buffer[0] = buffer[0];
	touchkit->buf_len = 1;
	return;
	}

	/* loop over the buffer */
	pos = 0;
	while (pos < buf_len) {
	/* get packet len */
	pkt_len = touchkit_get_pkt_len(buffer + pos);

	/* unknown packet: drop everything */
	if (unlikely(!pkt_len))
	return;

	/* full packet: process */
	if (likely(pkt_len <= buf_len)) {
	touchkit_process_pkt(touchkit, regs, buffer + pos);
	} else {
	/* incomplete packet: save in buffer */
	memcpy(touchkit->buffer, buffer + pos, buf_len - pos);
	touchkit->buf_len = buf_len - pos;
	}
	pos += pkt_len;
	}
	}


	static void touchkit_irq(struct urb urb, struct pt_regs regs)
	{
	struct touchkit_usb *touchkit = urb->context;
	int retval;

	switch (urb->status) {
	case 0:
	/* success */
	break;
	case -ETIMEDOUT:
	/* this urb is timing out */
	dbg("%s - urb timed out - was the device unplugged?",
	__FUNCTION__);
	return;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	/* this urb is terminated, clean up */
	dbg("%s - urb shutting down with status: %d",
	__FUNCTION__, urb->status);
	return;
	default:
	dbg("%s - nonzero urb status received: %d",
	__FUNCTION__, urb->status);
	goto exit;
	}

	touchkit_process(touchkit, urb->actual_length, regs);

	exit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
	err("%s - usb_submit_urb failed with result: %d",
	__FUNCTION__, retval);
	}

	static int touchkit_open(struct input_dev *input)
	{
	struct touchkit_usb *touchkit = input->private;

	touchkit->irq->dev = touchkit->udev;

	if (usb_submit_urb(touchkit->irq, GFP_ATOMIC))
	return -EIO;

	return 0;
	}

	static void touchkit_close(struct input_dev *input)
	{
	struct touchkit_usb *touchkit = input->private;

	usb_kill_urb(touchkit->irq);
	}

	static int touchkit_alloc_buffers(struct usb_device *udev,
	struct touchkit_usb *touchkit)
	{
	touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
	SLAB_ATOMIC, &touchkit->data_dma);

	if (!touchkit->data)
	return -1;

	return 0;
	}

	static void touchkit_free_buffers(struct usb_device *udev,
	struct touchkit_usb *touchkit)
	{
	if (touchkit->data)
	usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
	touchkit->data, touchkit->data_dma);
	}

	static int touchkit_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	struct touchkit_usb *touchkit;
	struct input_dev *input_dev;
	struct usb_host_interface *interface;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_device *udev = interface_to_usbdev(intf);

	interface = intf->cur_altsetting;
	endpoint = &interface->endpoint[0].desc;

	touchkit = kzalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!touchkit \|\| !input_dev)
	goto out_free;

	if (touchkit_alloc_buffers(udev, touchkit))
	goto out_free;

	touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
	if (!touchkit->irq) {
	dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
	goto out_free_buffers;
	}

	touchkit->udev = udev;
	touchkit->input = input_dev;

	if (udev->manufacturer)
	strlcpy(touchkit->name, udev->manufacturer, sizeof(touchkit->name));

	if (udev->product) {
	if (udev->manufacturer)
	strlcat(touchkit->name, " ", sizeof(touchkit->name));
	strlcat(touchkit->name, udev->product, sizeof(touchkit->name));
	}

	if (!strlen(touchkit->name))
	snprintf(touchkit->name, sizeof(touchkit->name),
	"USB Touchscreen %04x:%04x",
	le16_to_cpu(udev->descriptor.idVendor),
	le16_to_cpu(udev->descriptor.idProduct));

	usb_make_path(udev, touchkit->phys, sizeof(touchkit->phys));
	strlcpy(touchkit->phys, "/input0", sizeof(touchkit->phys));

	input_dev->name = touchkit->name;
	input_dev->phys = touchkit->phys;
	usb_to_input_id(udev, &input_dev->id);
	input_dev->cdev.dev = &intf->dev;
	input_dev->private = touchkit;
	input_dev->open = touchkit_open;
	input_dev->close = touchkit_close;

	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS);
	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
	input_set_abs_params(input_dev, ABS_X, TOUCHKIT_MIN_XC, TOUCHKIT_MAX_XC,
	TOUCHKIT_XC_FUZZ, TOUCHKIT_XC_FLAT);
	input_set_abs_params(input_dev, ABS_Y, TOUCHKIT_MIN_YC, TOUCHKIT_MAX_YC,
	TOUCHKIT_YC_FUZZ, TOUCHKIT_YC_FLAT);

	usb_fill_int_urb(touchkit->irq, touchkit->udev,
	usb_rcvintpipe(touchkit->udev, 0x81),
	touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
	touchkit_irq, touchkit, endpoint->bInterval);

	touchkit->irq->transfer_dma = touchkit->data_dma;
	touchkit->irq->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;

	input_register_device(touchkit->input);

	usb_set_intfdata(intf, touchkit);
	return 0;

	out_free_buffers:
	touchkit_free_buffers(udev, touchkit);
	out_free:
	input_free_device(input_dev);
	kfree(touchkit);
	return -ENOMEM;
	}

	static void touchkit_disconnect(struct usb_interface *intf)
	{
	struct touchkit_usb *touchkit = usb_get_intfdata(intf);

	dbg("%s - called", __FUNCTION__);

	if (!touchkit)
	return;

	dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
	usb_set_intfdata(intf, NULL);
	usb_kill_urb(touchkit->irq);
	input_unregister_device(touchkit->input);
	usb_free_urb(touchkit->irq);
	touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
	kfree(touchkit);
	}

	MODULE_DEVICE_TABLE(usb, touchkit_devices);

	static struct usb_driver touchkit_driver = {
	.name = "touchkitusb",
	.probe = touchkit_probe,
	.disconnect = touchkit_disconnect,
	.id_table = touchkit_devices,
	};

	static int __init touchkit_init(void)
	{
	return usb_register(&touchkit_driver);
	}

	static void __exit touchkit_cleanup(void)
	{
	usb_deregister(&touchkit_driver);
	}

	module_init(touchkit_init);
	module_exit(touchkit_cleanup);

	MODULE_AUTHOR(DRIVER_AUTHOR);
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");