/*
 *  USB Wacom Graphire and Wacom Intuos tablet support
 *
 *  Copyright (c) 2000-2004 Vojtech Pavlik	<vojtech@ucw.cz>
 *  Copyright (c) 2000 Andreas Bach Aaen	<abach@stofanet.dk>
 *  Copyright (c) 2000 Clifford Wolf		<clifford@clifford.at>
 *  Copyright (c) 2000 Sam Mosel		<sam.mosel@computer.org>
 *  Copyright (c) 2000 James E. Blair		<corvus@gnu.org>
 *  Copyright (c) 2000 Daniel Egger		<egger@suse.de>
 *  Copyright (c) 2001 Frederic Lepied		<flepied@mandrakesoft.com>
 *  Copyright (c) 2004 Panagiotis Issaris	<panagiotis.issaris@mech.kuleuven.ac.be>
 *  Copyright (c) 2002-2005 Ping Cheng		<pingc@wacom.com>
 *
 *  ChangeLog:
 *      v0.1 (vp)  - Initial release
 *      v0.2 (aba) - Support for all buttons / combinations
 *      v0.3 (vp)  - Support for Intuos added
 *	v0.4 (sm)  - Support for more Intuos models, menustrip
 *			relative mode, proximity.
 *	v0.5 (vp)  - Big cleanup, nifty features removed,
 *			they belong in userspace
 *	v1.8 (vp)  - Submit URB only when operating, moved to CVS,
 *			use input_report_key instead of report_btn and
 *			other cleanups
 *	v1.11 (vp) - Add URB ->dev setting for new kernels
 *	v1.11 (jb) - Add support for the 4D Mouse & Lens
 *	v1.12 (de) - Add support for two more inking pen IDs
 *	v1.14 (vp) - Use new USB device id probing scheme.
 *		     Fix Wacom Graphire mouse wheel
 *	v1.18 (vp) - Fix mouse wheel direction
 *		     Make mouse relative
 *      v1.20 (fl) - Report tool id for Intuos devices
 *                 - Multi tools support
 *                 - Corrected Intuos protocol decoding (airbrush, 4D mouse, lens cursor...)
 *                 - Add PL models support
 *		   - Fix Wacom Graphire mouse wheel again
 *	v1.21 (vp) - Removed protocol descriptions
 *		   - Added MISC_SERIAL for tool serial numbers
 *	      (gb) - Identify version on module load.
 *    v1.21.1 (fl) - added Graphire2 support
 *    v1.21.2 (fl) - added Intuos2 support
 *                 - added all the PL ids
 *    v1.21.3 (fl) - added another eraser id from Neil Okamoto
 *                 - added smooth filter for Graphire from Peri Hankey
 *                 - added PenPartner support from Olaf van Es
 *                 - new tool ids from Ole Martin Bjoerndalen
 *	v1.29 (pc) - Add support for more tablets
 *		   - Fix pressure reporting
 *	v1.30 (vp) - Merge 2.4 and 2.5 drivers
 *		   - Since 2.5 now has input_sync(), remove MSC_SERIAL abuse
 *		   - Cleanups here and there
 *    v1.30.1 (pi) - Added Graphire3 support
 *	v1.40 (pc) - Add support for several new devices, fix eraser reporting, ...
 *	v1.43 (pc) - Added support for Cintiq 21UX
 *		   - Fixed a Graphire bug
 *		   - Merged wacom_intuos3_irq into wacom_intuos_irq
 *	v1.44 (pc) - Added support for Graphire4, Cintiq 710, Intuos3 6x11, etc.
 *		   - Report Device IDs
 */

/*
 * 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/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb.h>
#include <linux/usb_input.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.44"
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB Wacom Graphire and Wacom Intuos tablet driver"
#define DRIVER_LICENSE "GPL"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);

#define USB_VENDOR_ID_WACOM	0x056a
#define STYLUS_DEVICE_ID	0x02
#define CURSOR_DEVICE_ID	0x06
#define ERASER_DEVICE_ID	0x0A

enum {
	PENPARTNER = 0,
	GRAPHIRE,
	WACOM_G4,
	PL,
	INTUOS,
	INTUOS3,
	CINTIQ,
	MAX_TYPE
};

struct wacom_features {
	char *name;
	int pktlen;
	int x_max;
	int y_max;
	int pressure_max;
	int distance_max;
	int type;
	usb_complete_t irq;
};

struct wacom {
	signed char *data;
	dma_addr_t data_dma;
	struct input_dev *dev;
	struct usb_device *usbdev;
	struct urb *irq;
	struct wacom_features *features;
	int tool[2];
	int id[2];
	__u32 serial[2];
	char phys[32];
};

#define USB_REQ_SET_REPORT	0x09
static int usb_set_report(struct usb_interface *intf, unsigned char type,
				unsigned char id, void *buf, int size)
{
	return usb_control_msg(interface_to_usbdev(intf),
		usb_sndctrlpipe(interface_to_usbdev(intf), 0),
                USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
		buf, size, 1000);
}

static void wacom_pl_irq(struct urb *urb, struct pt_regs *regs)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	int prox, pressure, id;
	int retval;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	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;
	}

	if (data[0] != 2) {
		dbg("wacom_pl_irq: received unknown report #%d", data[0]);
		goto exit;
	}

	prox = data[1] & 0x40;

	input_regs(dev, regs);

	id = ERASER_DEVICE_ID;
	if (prox) {

		pressure = (signed char)((data[7] << 1) | ((data[4] >> 2) & 1));
		if (wacom->features->pressure_max > 255)
			pressure = (pressure << 1) | ((data[4] >> 6) & 1);
		pressure += (wacom->features->pressure_max + 1) / 2;

		/*
		 * if going from out of proximity into proximity select between the eraser
		 * and the pen based on the state of the stylus2 button, choose eraser if
		 * pressed else choose pen. if not a proximity change from out to in, send
		 * an out of proximity for previous tool then a in for new tool.
		 */
		if (!wacom->tool[0]) {
			/* Eraser bit set for DTF */
			if (data[1] & 0x10)
				wacom->tool[1] = BTN_TOOL_RUBBER;
			else
				/* Going into proximity select tool */
				wacom->tool[1] = (data[4] & 0x20) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
		} else {
			/* was entered with stylus2 pressed */
			if (wacom->tool[1] == BTN_TOOL_RUBBER && !(data[4] & 0x20)) {
				/* report out proximity for previous tool */
				input_report_key(dev, wacom->tool[1], 0);
				input_sync(dev);
				wacom->tool[1] = BTN_TOOL_PEN;
				goto exit;
			}
		}
		if (wacom->tool[1] != BTN_TOOL_RUBBER) {
			/* Unknown tool selected default to pen tool */
			wacom->tool[1] = BTN_TOOL_PEN;
			id = STYLUS_DEVICE_ID;
		}
		input_report_key(dev, wacom->tool[1], id); /* report in proximity for tool */
		input_report_abs(dev, ABS_X, data[3] | (data[2] << 7) | ((data[1] & 0x03) << 14));
		input_report_abs(dev, ABS_Y, data[6] | (data[5] << 7) | ((data[4] & 0x03) << 14));
		input_report_abs(dev, ABS_PRESSURE, pressure);

		input_report_key(dev, BTN_TOUCH, data[4] & 0x08);
		input_report_key(dev, BTN_STYLUS, data[4] & 0x10);
		/* Only allow the stylus2 button to be reported for the pen tool. */
		input_report_key(dev, BTN_STYLUS2, (wacom->tool[1] == BTN_TOOL_PEN) && (data[4] & 0x20));
	} else {
		/* report proximity-out of a (valid) tool */
		if (wacom->tool[1] != BTN_TOOL_RUBBER) {
			/* Unknown tool selected default to pen tool */
			wacom->tool[1] = BTN_TOOL_PEN;
		}
		input_report_key(dev, wacom->tool[1], prox);
	}

	wacom->tool[0] = prox; /* Save proximity state */
	input_sync(dev);

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

static void wacom_ptu_irq(struct urb *urb, struct pt_regs *regs)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	int retval;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	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;
	}

	if (data[0] != 2) {
		printk(KERN_INFO "wacom_ptu_irq: received unknown report #%d\n", data[0]);
		goto exit;
	}

	input_regs(dev, regs);
	if (data[1] & 0x04) {
		input_report_key(dev, BTN_TOOL_RUBBER, (data[1] & 0x20) ? ERASER_DEVICE_ID : 0);
		input_report_key(dev, BTN_TOUCH, data[1] & 0x08);
	} else {
		input_report_key(dev, BTN_TOOL_PEN, (data[1] & 0x20) ? STYLUS_DEVICE_ID : 0);
		input_report_key(dev, BTN_TOUCH, data[1] & 0x01);
	}
	input_report_abs(dev, ABS_X, le16_to_cpu(*(__le16 *) &data[2]));
	input_report_abs(dev, ABS_Y, le16_to_cpu(*(__le16 *) &data[4]));
	input_report_abs(dev, ABS_PRESSURE, le16_to_cpu(*(__le16 *) &data[6]));
	input_report_key(dev, BTN_STYLUS, data[1] & 0x02);
	input_report_key(dev, BTN_STYLUS2, data[1] & 0x10);

	input_sync(dev);

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

static void wacom_penpartner_irq(struct urb *urb, struct pt_regs *regs)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	int retval;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	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;
	}

	if (data[0] != 2) {
		printk(KERN_INFO "wacom_penpartner_irq: received unknown report #%d\n", data[0]);
		goto exit;
	}

	input_regs(dev, regs);
	input_report_key(dev, BTN_TOOL_PEN, STYLUS_DEVICE_ID);
	input_report_abs(dev, ABS_X, le16_to_cpu(*(__le16 *) &data[1]));
	input_report_abs(dev, ABS_Y, le16_to_cpu(*(__le16 *) &data[3]));
	input_report_abs(dev, ABS_PRESSURE, (signed char)data[6] + 127);
	input_report_key(dev, BTN_TOUCH, ((signed char)data[6] > -80) && !(data[5] & 0x20));
	input_report_key(dev, BTN_STYLUS, (data[5] & 0x40));
	input_sync(dev);

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

static void wacom_graphire_irq(struct urb *urb, struct pt_regs *regs)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	int x, y, id, rw;
	int retval;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	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;
	}

	if (data[0] != 2) {
		dbg("wacom_graphire_irq: received unknown report #%d", data[0]);
		goto exit;
	}

	input_regs(dev, regs);

	id = STYLUS_DEVICE_ID;
	if (data[1] & 0x10) { /* in prox */

		switch ((data[1] >> 5) & 3) {

			case 0:	/* Pen */
				wacom->tool[0] = BTN_TOOL_PEN;
				break;

			case 1: /* Rubber */
				wacom->tool[0] = BTN_TOOL_RUBBER;
				id = ERASER_DEVICE_ID;
				break;

			case 2: /* Mouse with wheel */
				input_report_key(dev, BTN_MIDDLE, data[1] & 0x04);
				if (wacom->features->type == WACOM_G4) {
					rw = data[7] & 0x04 ? -(data[7] & 0x03) : (data[7] & 0x03);
					input_report_rel(dev, REL_WHEEL, rw);
				} else
					input_report_rel(dev, REL_WHEEL, (signed char) data[6]);
				/* fall through */

			case 3: /* Mouse without wheel */
				wacom->tool[0] = BTN_TOOL_MOUSE;
				id = CURSOR_DEVICE_ID;
				input_report_key(dev, BTN_LEFT, data[1] & 0x01);
				input_report_key(dev, BTN_RIGHT, data[1] & 0x02);
				if (wacom->features->type == WACOM_G4)
					input_report_abs(dev, ABS_DISTANCE, data[6]);
				else
					input_report_abs(dev, ABS_DISTANCE, data[7]);
				break;
		}
	}

	if (data[1] & 0x90) {
		x = le16_to_cpu(*(__le16 *) &data[2]);
		y = le16_to_cpu(*(__le16 *) &data[4]);
		input_report_abs(dev, ABS_X, x);
		input_report_abs(dev, ABS_Y, y);
		if (wacom->tool[0] != BTN_TOOL_MOUSE) {
			input_report_abs(dev, ABS_PRESSURE, data[6] | ((data[7] & 0x01) << 8));
			input_report_key(dev, BTN_TOUCH, data[1] & 0x01);
			input_report_key(dev, BTN_STYLUS, data[1] & 0x02);
			input_report_key(dev, BTN_STYLUS2, data[1] & 0x04);
		}
	}

	input_report_key(dev, wacom->tool[0], (data[1] & 0x10) ? id : 0);
	input_sync(dev);

	/* send pad data */
	if (wacom->features->type == WACOM_G4) {
		/* fist time sending pad data */
		if (wacom->tool[1] != BTN_TOOL_FINGER) {
			wacom->id[1] = 0;
			wacom->serial[1] = (data[7] & 0x38) >> 2;
		}
		if (data[7] & 0xf8) {
			input_report_key(dev, BTN_0, (data[7] & 0x40));
			input_report_key(dev, BTN_4, (data[7] & 0x80));
			if (((data[7] & 0x38) >> 2) == (wacom->serial[1] & 0x0e))
				/* alter REL_WHEEL value so X apps can get it */
				wacom->serial[1] += (wacom->serial[1] & 0x01) ? -1 : 1;
			else
				 wacom->serial[1] = (data[7] & 0x38 ) >> 2;

			/* don't alter the value when there is no wheel event */
			if (wacom->serial[1] == 1)
				wacom->serial[1] = 0;
			rw = wacom->serial[1];
			rw = (rw & 0x08) ? -(rw & 0x07) : (rw & 0x07);
			input_report_rel(dev, REL_WHEEL, rw);
			wacom->tool[1] = BTN_TOOL_FINGER;
			wacom->id[1] = data[7] & 0xf8;
			input_report_key(dev, wacom->tool[1], 0xf0);
			input_event(dev, EV_MSC, MSC_SERIAL, 0xf0);
		} else if (wacom->id[1]) {
			wacom->id[1] = 0;
			wacom->serial[1] = 0;
			input_report_key(dev, wacom->tool[1], 0);
			input_event(dev, EV_MSC, MSC_SERIAL, 0xf0);
		}
		input_sync(dev);
	}
 exit:
	retval = usb_submit_urb (urb, GFP_ATOMIC);
	if (retval)
		err ("%s - usb_submit_urb failed with result %d",
		     __FUNCTION__, retval);
}

static int wacom_intuos_inout(struct urb *urb)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	int idx;

	/* tool number */
	idx = data[1] & 0x01;

	/* Enter report */
	if ((data[1] & 0xfc) == 0xc0) {
		/* serial number of the tool */
		wacom->serial[idx] = ((data[3] & 0x0f) << 28) +
			(data[4] << 20) + (data[5] << 12) +
			(data[6] << 4) + (data[7] >> 4);

		wacom->id[idx] = (data[2] << 4) | (data[3] >> 4);
		switch (wacom->id[idx]) {
			case 0x812: /* Inking pen */
			case 0x801: /* Intuos3 Inking pen */
			case 0x012:
				wacom->tool[idx] = BTN_TOOL_PENCIL;
				break;
			case 0x822: /* Pen */
			case 0x842:
			case 0x852:
			case 0x823: /* Intuos3 Grip Pen */
			case 0x813: /* Intuos3 Classic Pen */
			case 0x885: /* Intuos3 Marker Pen */
			case 0x022:
				wacom->tool[idx] = BTN_TOOL_PEN;
				break;
			case 0x832: /* Stroke pen */
			case 0x032:
				wacom->tool[idx] = BTN_TOOL_BRUSH;
				break;
			case 0x007: /* Mouse 4D and 2D */
		        case 0x09c:
			case 0x094:
			case 0x017: /* Intuos3 2D Mouse */
				wacom->tool[idx] = BTN_TOOL_MOUSE;
				break;
			case 0x096: /* Lens cursor */
			case 0x097: /* Intuos3 Lens cursor */
				wacom->tool[idx] = BTN_TOOL_LENS;
				break;
			case 0x82a: /* Eraser */
			case 0x85a:
		        case 0x91a:
			case 0xd1a:
			case 0x0fa:
			case 0x82b: /* Intuos3 Grip Pen Eraser */
			case 0x81b: /* Intuos3 Classic Pen Eraser */
			case 0x91b: /* Intuos3 Airbrush Eraser */
				wacom->tool[idx] = BTN_TOOL_RUBBER;
				break;
			case 0xd12:
			case 0x912:
			case 0x112:
			case 0x913: /* Intuos3 Airbrush */
				wacom->tool[idx] = BTN_TOOL_AIRBRUSH;
				break;
			default: /* Unknown tool */
				wacom->tool[idx] = BTN_TOOL_PEN;
		}
		input_report_key(dev, wacom->tool[idx], wacom->id[idx]);
		input_event(dev, EV_MSC, MSC_SERIAL, wacom->serial[idx]);
		input_sync(dev);
		return 1;
	}

	/* Exit report */
	if ((data[1] & 0xfe) == 0x80) {
		input_report_key(dev, wacom->tool[idx], 0);
		input_event(dev, EV_MSC, MSC_SERIAL, wacom->serial[idx]);
		input_sync(dev);
		return 1;
	}

	return 0;
}

static void wacom_intuos_general(struct urb *urb)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	unsigned int t;

	/* general pen packet */
	if ((data[1] & 0xb8) == 0xa0) {
		t = (data[6] << 2) | ((data[7] >> 6) & 3);
		input_report_abs(dev, ABS_PRESSURE, t);
		input_report_abs(dev, ABS_TILT_X,
				((data[7] << 1) & 0x7e) | (data[8] >> 7));
		input_report_abs(dev, ABS_TILT_Y, data[8] & 0x7f);
		input_report_key(dev, BTN_STYLUS, data[1] & 2);
		input_report_key(dev, BTN_STYLUS2, data[1] & 4);
		input_report_key(dev, BTN_TOUCH, t > 10);
	}

	/* airbrush second packet */
	if ((data[1] & 0xbc) == 0xb4) {
		input_report_abs(dev, ABS_WHEEL,
				(data[6] << 2) | ((data[7] >> 6) & 3));
		input_report_abs(dev, ABS_TILT_X,
				((data[7] << 1) & 0x7e) | (data[8] >> 7));
		input_report_abs(dev, ABS_TILT_Y, data[8] & 0x7f);
	}
	return;
}

static void wacom_intuos_irq(struct urb *urb, struct pt_regs *regs)
{
	struct wacom *wacom = urb->context;
	unsigned char *data = wacom->data;
	struct input_dev *dev = wacom->dev;
	unsigned int t;
	int idx;
	int retval;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	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;
	}

	if (data[0] != 2 && data[0] != 5 && data[0] != 6 && data[0] != 12) {
		dbg("wacom_intuos_irq: received unknown report #%d", data[0]);
		goto exit;
	}

	input_regs(dev, regs);

	/* tool number */
	idx = data[1] & 0x01;

	/* pad packets. Works as a second tool and is always in prox */
	if (data[0] == 12) {
		/* initiate the pad as a device */
		if (wacom->tool[1] != BTN_TOOL_FINGER) {
			wacom->tool[1] = BTN_TOOL_FINGER;
			input_report_key(dev, wacom->tool[1], 1);
		}
		input_report_key(dev, BTN_0, (data[5] & 0x01));
		input_report_key(dev, BTN_1, (data[5] & 0x02));
		input_report_key(dev, BTN_2, (data[5] & 0x04));
		input_report_key(dev, BTN_3, (data[5] & 0x08));
		input_report_key(dev, BTN_4, (data[6] & 0x01));
		input_report_key(dev, BTN_5, (data[6] & 0x02));
		input_report_key(dev, BTN_6, (data[6] & 0x04));
		input_report_key(dev, BTN_7, (data[6] & 0x08));
		input_report_abs(dev, ABS_RX, ((data[1] & 0x1f) << 8) | data[2]);
		input_report_abs(dev, ABS_RY, ((data[3] & 0x1f) << 8) | data[4]);
		input_event(dev, EV_MSC, MSC_SERIAL, 0xffffffff);
		input_sync(dev);
		goto exit;
	}

	/* process in/out prox events */
	if (wacom_intuos_inout(urb))
		goto exit;

	/* Cintiq doesn't send data when RDY bit isn't set */
	if ((wacom->features->type == CINTIQ) && !(data[1] & 0x40))
		goto exit;

	if (wacom->features->type >= INTUOS3) {
		input_report_abs(dev, ABS_X, (data[2] << 9) | (data[3] << 1) | ((data[9] >> 1) & 1));
		input_report_abs(dev, ABS_Y, (data[4] << 9) | (data[5] << 1) | (data[9] & 1));
		input_report_abs(dev, ABS_DISTANCE, ((data[9] >> 2) & 0x3f));
	} else {
		input_report_abs(dev, ABS_X, be16_to_cpu(*(__be16 *) &data[2]));
		input_report_abs(dev, ABS_Y, be16_to_cpu(*(__be16 *) &data[4]));
		input_report_abs(dev, ABS_DISTANCE, ((data[9] >> 3) & 0x1f));
	}

	/* process general packets */
	wacom_intuos_general(urb);

	/* 4D mouse, 2D mouse, marker pen rotation, or Lens cursor packets */
	if ((data[1] & 0xbc) == 0xa8 || (data[1] & 0xbe) == 0xb0) {

		if (data[1] & 0x02) {
			/* Rotation packet */
			if (wacom->features->type >= INTUOS3) {
				/* I3 marker pen rotation reported as wheel
				 * due to valuator limitation
				 */
				t = (data[6] << 3) | ((data[7] >> 5) & 7);
				t = (data[7] & 0x20) ? ((t > 900) ? ((t-1) / 2 - 1350) :
					((t-1) / 2 + 450)) : (450 - t / 2) ;
				input_report_abs(dev, ABS_WHEEL, t);
			} else {
				/* 4D mouse rotation packet */
				t = (data[6] << 3) | ((data[7] >> 5) & 7);
				input_report_abs(dev, ABS_RZ, (data[7] & 0x20) ?
					((t - 1) / 2) : -t / 2);
			}

		} else if (!(data[1] & 0x10) && wacom->features->type < INTUOS3) {
			/* 4D mouse packet */
			input_report_key(dev, BTN_LEFT,   data[8] & 0x01);
			input_report_key(dev, BTN_MIDDLE, data[8] & 0x02);
			input_report_key(dev, BTN_RIGHT,  data[8] & 0x04);

			input_report_key(dev, BTN_SIDE,   data[8] & 0x20);
			input_report_key(dev, BTN_EXTRA,  data[8] & 0x10);
			t = (data[6] << 2) | ((data[7] >> 6) & 3);
			input_report_abs(dev, ABS_THROTTLE, (data[8] & 0x08) ? -t : t);

		} else if (wacom->tool[idx] == BTN_TOOL_MOUSE) {
			/* 2D mouse packet */
			input_report_key(dev, BTN_LEFT,   data[8] & 0x04);
			input_report_key(dev, BTN_MIDDLE, data[8] & 0x08);
			input_report_key(dev, BTN_RIGHT,  data[8] & 0x10);
			input_report_rel(dev, REL_WHEEL, ((data[8] & 0x02) >> 1)
						 - (data[8] & 0x01));

			/* I3 2D mouse side buttons */
			if (wacom->features->type == INTUOS3) {
				input_report_key(dev, BTN_SIDE,   data[8] & 0x40);
				input_report_key(dev, BTN_EXTRA,  data[8] & 0x20);
			}

		} else if (wacom->features->type < INTUOS3) {
			/* Lens cursor packets */
			input_report_key(dev, BTN_LEFT,   data[8] & 0x01);
			input_report_key(dev, BTN_MIDDLE, data[8] & 0x02);
			input_report_key(dev, BTN_RIGHT,  data[8] & 0x04);
			input_report_key(dev, BTN_SIDE,   data[8] & 0x10);
			input_report_key(dev, BTN_EXTRA,  data[8] & 0x08);
		}
	}

	input_report_key(dev, wacom->tool[idx], wacom->id[idx]);
	input_event(dev, EV_MSC, MSC_SERIAL, wacom->serial[idx]);
	input_sync(dev);

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

static struct wacom_features wacom_features[] = {
	{ "Wacom Penpartner",    7,   5040,  3780,  255, 32, PENPARTNER, wacom_penpartner_irq },
        { "Wacom Graphire",      8,  10206,  7422,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Graphire2 4x5", 8,  10206,  7422,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Graphire2 5x7", 8,  13918, 10206,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Graphire3",     8,  10208,  7424,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Graphire3 6x8", 8,  16704, 12064,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Graphire4 4x5", 8,  10208,  7424,  511, 32, WACOM_G4,	 wacom_graphire_irq },
	{ "Wacom Graphire4 6x8", 8,  16704, 12064,  511, 32, WACOM_G4,	 wacom_graphire_irq },
	{ "Wacom Volito",        8,   5104,  3712,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom PenStation2",   8,   3250,  2320,  255, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Volito2 4x5",   8,   5104,  3712,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Volito2 2x3",   8,   3248,  2320,  511, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom PenPartner2",   8,   3250,  2320,  255, 32, GRAPHIRE,   wacom_graphire_irq },
	{ "Wacom Intuos 4x5",   10,  12700, 10600, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos 6x8",   10,  20320, 16240, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos 9x12",  10,  30480, 24060, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos 12x12", 10,  30480, 31680, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos 12x18", 10,  45720, 31680, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom PL400",         8,   5408,  4056,  255, 32, PL,         wacom_pl_irq },
	{ "Wacom PL500",         8,   6144,  4608,  255, 32, PL,         wacom_pl_irq },
	{ "Wacom PL600",         8,   6126,  4604,  255, 32, PL,         wacom_pl_irq },
	{ "Wacom PL600SX",       8,   6260,  5016,  255, 32, PL,         wacom_pl_irq },
	{ "Wacom PL550",         8,   6144,  4608,  511, 32, PL,         wacom_pl_irq },
	{ "Wacom PL800",         8,   7220,  5780,  511, 32, PL,         wacom_pl_irq },
	{ "Wacom PL700",         8,   6758,  5406,  511, 32, PL,	 wacom_pl_irq },
	{ "Wacom PL510",         8,   6282,  4762,  511, 32, PL,	 wacom_pl_irq },
	{ "Wacom PL710",         8,  34080, 27660,  511, 32, PL,	 wacom_pl_irq },
	{ "Wacom DTF720",        8,   6858,  5506,  511, 32, PL,	 wacom_pl_irq },
	{ "Wacom Cintiq Partner",8,  20480, 15360,  511, 32, PL,         wacom_ptu_irq },
	{ "Wacom Intuos2 4x5",   10, 12700, 10600, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos2 6x8",   10, 20320, 16240, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos2 9x12",  10, 30480, 24060, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos2 12x12", 10, 30480, 31680, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos2 12x18", 10, 45720, 31680, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ "Wacom Intuos3 4x5",   10, 25400, 20320, 1023, 15, INTUOS3,    wacom_intuos_irq },
	{ "Wacom Intuos3 6x8",   10, 40640, 30480, 1023, 15, INTUOS3,    wacom_intuos_irq },
	{ "Wacom Intuos3 9x12",  10, 60960, 45720, 1023, 15, INTUOS3,    wacom_intuos_irq },
	{ "Wacom Intuos3 6x11",  10, 54204, 31750, 1023, 15, INTUOS3,    wacom_intuos_irq },
	{ "Wacom Cintiq 21UX",   10, 87200, 65600, 1023, 15, CINTIQ,     wacom_intuos_irq },
	{ "Wacom Intuos2 6x8",   10, 20320, 16240, 1023, 15, INTUOS,     wacom_intuos_irq },
	{ }
};

static struct usb_device_id wacom_ids[] = {
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x00) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x10) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x11) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x12) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x13) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x14) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x15) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x16) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x60) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x61) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x62) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x63) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x64) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x20) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x21) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x22) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x23) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x24) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x30) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x31) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x32) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x33) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x34) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x35) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x37) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x38) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x39) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xC0) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x03) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x41) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x42) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x43) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x44) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x45) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xB0) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xB1) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xB2) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0xB5) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x3F) },
	{ USB_DEVICE(USB_VENDOR_ID_WACOM, 0x47) },
	{ }
};

MODULE_DEVICE_TABLE(usb, wacom_ids);

static int wacom_open(struct input_dev *dev)
{
	struct wacom *wacom = dev->private;

	wacom->irq->dev = wacom->usbdev;
	if (usb_submit_urb(wacom->irq, GFP_KERNEL))
		return -EIO;

	return 0;
}

static void wacom_close(struct input_dev *dev)
{
	struct wacom *wacom = dev->private;

	usb_kill_urb(wacom->irq);
}

static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *endpoint;
	struct wacom *wacom;
	struct input_dev *input_dev;
	char rep_data[2] = {0x02, 0x02};

	wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!wacom || !input_dev)
		goto fail1;

	wacom->data = usb_buffer_alloc(dev, 10, GFP_KERNEL, &wacom->data_dma);
	if (!wacom->data)
		goto fail1;

	wacom->irq = usb_alloc_urb(0, GFP_KERNEL);
	if (!wacom->irq)
		goto fail2;

	wacom->usbdev = dev;
	wacom->dev = input_dev;
	usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
	strlcat(wacom->phys, "/input0", sizeof(wacom->phys));

	wacom->features = wacom_features + (id - wacom_ids);
	if (wacom->features->pktlen > 10)
		BUG();

	input_dev->name = wacom->features->name;
	usb_to_input_id(dev, &input_dev->id);

	input_dev->cdev.dev = &intf->dev;
	input_dev->private = wacom;
	input_dev->open = wacom_open;
	input_dev->close = wacom_close;

	input_dev->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS);
	input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_PEN) | BIT(BTN_TOUCH) | BIT(BTN_STYLUS);
	input_set_abs_params(input_dev, ABS_X, 0, wacom->features->x_max, 4, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, wacom->features->y_max, 4, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, wacom->features->pressure_max, 0, 0);

	switch (wacom->features->type) {
		case WACOM_G4:
			input_dev->evbit[0] |= BIT(EV_MSC);
			input_dev->mscbit[0] |= BIT(MSC_SERIAL);
			input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_FINGER);
			input_dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_0) | BIT(BTN_1) | BIT(BTN_2) | BIT(BTN_3) | BIT(BTN_4) | BIT(BTN_5) | BIT(BTN_6) | BIT(BTN_7);
			/* fall through */

		case GRAPHIRE:
			input_dev->evbit[0] |= BIT(EV_REL);
			input_dev->relbit[0] |= BIT(REL_WHEEL);
			input_dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
			input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_RUBBER) | BIT(BTN_TOOL_MOUSE) | BIT(BTN_STYLUS2);
			input_set_abs_params(input_dev, ABS_DISTANCE, 0, wacom->features->distance_max, 0, 0);
			break;

		case INTUOS3:
		case CINTIQ:
			input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_FINGER);
			input_dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_0) | BIT(BTN_1) | BIT(BTN_2) | BIT(BTN_3) | BIT(BTN_4) | BIT(BTN_5) | BIT(BTN_6) | BIT(BTN_7);
			input_set_abs_params(input_dev, ABS_RX, 0, 4097, 0, 0);
			input_set_abs_params(input_dev, ABS_RY, 0, 4097, 0, 0);
			/* fall through */

		case INTUOS:
			input_dev->evbit[0] |= BIT(EV_MSC) | BIT(EV_REL);
			input_dev->mscbit[0] |= BIT(MSC_SERIAL);
			input_dev->relbit[0] |= BIT(REL_WHEEL);
			input_dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE) | BIT(BTN_SIDE) | BIT(BTN_EXTRA);
			input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_RUBBER) | BIT(BTN_TOOL_MOUSE)	| BIT(BTN_TOOL_BRUSH)
							  | BIT(BTN_TOOL_PENCIL) | BIT(BTN_TOOL_AIRBRUSH) | BIT(BTN_TOOL_LENS) | BIT(BTN_STYLUS2);
			input_set_abs_params(input_dev, ABS_DISTANCE, 0, wacom->features->distance_max, 0, 0);
			input_set_abs_params(input_dev, ABS_WHEEL, 0, 1023, 0, 0);
			input_set_abs_params(input_dev, ABS_TILT_X, 0, 127, 0, 0);
			input_set_abs_params(input_dev, ABS_TILT_Y, 0, 127, 0, 0);
			input_set_abs_params(input_dev, ABS_RZ, -900, 899, 0, 0);
			input_set_abs_params(input_dev, ABS_THROTTLE, -1023, 1023, 0, 0);
			break;

		case PL:
			input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_STYLUS2) | BIT(BTN_TOOL_RUBBER);
			break;
	}

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

	if (wacom->features->pktlen > 10)
		BUG();

	usb_fill_int_urb(wacom->irq, dev,
			 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
			 wacom->data, wacom->features->pktlen,
			 wacom->features->irq, wacom, endpoint->bInterval);
	wacom->irq->transfer_dma = wacom->data_dma;
	wacom->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	input_register_device(wacom->dev);

	/* ask the tablet to report tablet data */
	usb_set_report(intf, 3, 2, rep_data, 2);
	/* repeat once (not sure why the first call often fails) */
	usb_set_report(intf, 3, 2, rep_data, 2);

	usb_set_intfdata(intf, wacom);
	return 0;

fail2:	usb_buffer_free(dev, 10, wacom->data, wacom->data_dma);
fail1:	input_free_device(input_dev);
	kfree(wacom);
	return -ENOMEM;
}

static void wacom_disconnect(struct usb_interface *intf)
{
	struct wacom *wacom = usb_get_intfdata (intf);

	usb_set_intfdata(intf, NULL);
	if (wacom) {
		usb_kill_urb(wacom->irq);
		input_unregister_device(wacom->dev);
		usb_free_urb(wacom->irq);
		usb_buffer_free(interface_to_usbdev(intf), 10, wacom->data, wacom->data_dma);
		kfree(wacom);
	}
}

static struct usb_driver wacom_driver = {
	.name =		"wacom",
	.probe =	wacom_probe,
	.disconnect =	wacom_disconnect,
	.id_table =	wacom_ids,
};

static int __init wacom_init(void)
{
	int result = usb_register(&wacom_driver);
	if (result == 0)
		info(DRIVER_VERSION ":" DRIVER_DESC);
	return result;
}

static void __exit wacom_exit(void)
{
	usb_deregister(&wacom_driver);
}

module_init(wacom_init);
module_exit(wacom_exit);