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aiptek.c

/*
 *  Native support for the Aiptek HyperPen USB Tablets
 *  (4000U/5000U/6000U/8000U/12000U)
 *
 *  Copyright (c) 2001      Chris Atenasio   <chris@crud.net>
 *  Copyright (c) 2002-2004 Bryan W. Headley <bwheadley@earthlink.net>
 *
 *  based on wacom.c by
 *     Vojtech Pavlik      <vojtech@suse.cz>
 *     Andreas Bach Aaen   <abach@stofanet.dk>
 *     Clifford Wolf       <clifford@clifford.at>
 *     Sam Mosel           <sam.mosel@computer.org>
 *     James E. Blair      <corvus@gnu.org>
 *     Daniel Egger        <egger@suse.de>
 *
 *  Many thanks to Oliver Kuechemann for his support.
 *
 *  ChangeLog:
 *      v0.1 - Initial release
 *      v0.2 - Hack to get around fake event 28's. (Bryan W. Headley)
 *      v0.3 - Make URB dynamic (Bryan W. Headley, Jun-8-2002)
 *             Released to Linux 2.4.19 and 2.5.x
 *      v0.4 - Rewrote substantial portions of the code to deal with
 *             corrected control sequences, timing, dynamic configuration,
 *             support of 6000U - 12000U, procfs, and macro key support
 *             (Jan-1-2003 - Feb-5-2003, Bryan W. Headley)
 *      v1.0 - Added support for diagnostic messages, count of messages
 *             received from URB - Mar-8-2003, Bryan W. Headley
 *      v1.1 - added support for tablet resolution, changed DV and proximity
 *             some corrections - Jun-22-2003, martin schneebacher
 *           - Added support for the sysfs interface, deprecating the
 *             procfs interface for 2.5.x kernel. Also added support for
 *             Wheel command. Bryan W. Headley July-15-2003.
 *      v1.2 - Reworked jitter timer as a kernel thread.
 *             Bryan W. Headley November-28-2003/Jan-10-2004.
 *      v1.3 - Repaired issue of kernel thread going nuts on single-processor
 *             machines, introduced programmableDelay as a command line
 *             parameter. Feb 7 2004, Bryan W. Headley.
 *      v1.4 - Re-wire jitter so it does not require a thread. Courtesy of
 *             Rene van Paassen. Added reporting of physical pointer device
 *             (e.g., stylus, mouse in reports 2, 3, 4, 5. We don't know
 *             for reports 1, 6.)
 *             what physical device reports for reports 1, 6.) Also enabled
 *             MOUSE and LENS tool button modes. Renamed "rubber" to "eraser".
 *             Feb 20, 2004, Bryan W. Headley.
 *      v1.5 - Added previousJitterable, so we don't do jitter delay when the
 *             user is holding a button down for periods of time.
 *
 * NOTE:
 *      This kernel driver is augmented by the "Aiptek" XFree86 input
 *      driver for your X server, as well as the Gaiptek GUI Front-end
 *      "Tablet Manager".
 *      These three products are highly interactive with one another,
 *      so therefore it's easier to document them all as one subsystem.
 *      Please visit the project's "home page", located at,
 *      http://aiptektablet.sourceforge.net.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "v2.3 (May 2, 2007)"
#define DRIVER_AUTHOR  "Bryan W. Headley/Chris Atenasio/Cedric Brun/Rene van Paassen"
#define DRIVER_DESC    "Aiptek HyperPen USB Tablet Driver (Linux 2.6.x)"

/*
 * Aiptek status packet:
 *
 * (returned as Report 1 - relative coordinates from mouse and stylus)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     0     0     1
 * byte1   0     0     0     0     0    BS2   BS    Tip
 * byte2  X7    X6    X5    X4    X3    X2    X1    X0
 * byte3  Y7    Y6    Y5    Y4    Y3    Y2    Y1    Y0
 *
 * (returned as Report 2 - absolute coordinates from the stylus)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     0     1     0
 * byte1  X7    X6    X5    X4    X3    X2    X1    X0
 * byte2  X15   X14   X13   X12   X11   X10   X9    X8
 * byte3  Y7    Y6    Y5    Y4    Y3    Y2    Y1    Y0
 * byte4  Y15   Y14   Y13   Y12   Y11   Y10   Y9    Y8
 * byte5   *     *     *    BS2   BS1   Tip   IR    DV
 * byte6  P7    P6    P5    P4    P3    P2    P1    P0
 * byte7  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * (returned as Report 3 - absolute coordinates from the mouse)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     0     1     1
 * byte1  X7    X6    X5    X4    X3    X2    X1    X0
 * byte2  X15   X14   X13   X12   X11   X10   X9    X8
 * byte3  Y7    Y6    Y5    Y4    Y3    Y2    Y1    Y0
 * byte4  Y15   Y14   Y13   Y12   Y11   Y10   Y9    Y8
 * byte5   *     *     *    BS2   BS1   Tip   IR    DV
 * byte6  P7    P6    P5    P4    P3    P2    P1    P0
 * byte7  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * (returned as Report 4 - macrokeys from the stylus)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     1     0     0
 * byte1   0     0     0    BS2   BS    Tip   IR    DV
 * byte2   0     0     0     0     0     0     1     0
 * byte3   0     0     0    K4    K3    K2    K1    K0
 * byte4  P7    P6    P5    P4    P3    P2    P1    P0
 * byte5  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * (returned as Report 5 - macrokeys from the mouse)
 *
 *        bit7  bit6  bit5  bit4  bit3  bit2  bit1  bit0
 * byte0   0     0     0     0     0     1     0     1
 * byte1   0     0     0    BS2   BS    Tip   IR    DV
 * byte2   0     0     0     0     0     0     1     0
 * byte3   0     0     0    K4    K3    K2    K1    K0
 * byte4  P7    P6    P5    P4    P3    P2    P1    P0
 * byte5  P15   P14   P13   P12   P11   P10   P9    P8
 *
 * IR: In Range = Proximity on
 * DV = Data Valid
 * BS = Barrel Switch (as in, macro keys)
 * BS2 also referred to as Tablet Pick
 *
 * Command Summary:
 *
 * Use report_type CONTROL (3)
 * Use report_id   2
 *
 * Command/Data    Description     Return Bytes    Return Value
 * 0x10/0x00       SwitchToMouse       0
 * 0x10/0x01       SwitchToTablet      0
 * 0x18/0x04       SetResolution       0
 * 0x12/0xFF       AutoGainOn          0
 * 0x17/0x00       FilterOn            0
 * 0x01/0x00       GetXExtension       2           MaxX
 * 0x01/0x01       GetYExtension       2           MaxY
 * 0x02/0x00       GetModelCode        2           ModelCode = LOBYTE
 * 0x03/0x00       GetODMCode          2           ODMCode
 * 0x08/0x00       GetPressureLevels   2           =512
 * 0x04/0x00       GetFirmwareVersion  2           Firmware Version
 * 0x11/0x02       EnableMacroKeys     0
 *
 * To initialize the tablet:
 *
 * (1) Send Resolution500LPI (Command)
 * (2) Query for Model code (Option Report)
 * (3) Query for ODM code (Option Report)
 * (4) Query for firmware (Option Report)
 * (5) Query for GetXExtension (Option Report)
 * (6) Query for GetYExtension (Option Report)
 * (7) Query for GetPressureLevels (Option Report)
 * (8) SwitchToTablet for Absolute coordinates, or
 *     SwitchToMouse for Relative coordinates (Command)
 * (9) EnableMacroKeys (Command)
 * (10) FilterOn (Command)
 * (11) AutoGainOn (Command)
 *
 * (Step 9 can be omitted, but you'll then have no function keys.)
 */

#define USB_VENDOR_ID_AIPTEK                    0x08ca
#define USB_REQ_GET_REPORT                      0x01
#define USB_REQ_SET_REPORT                      0x09

      /* PointerMode codes
       */
#define AIPTEK_POINTER_ONLY_MOUSE_MODE                0
#define AIPTEK_POINTER_ONLY_STYLUS_MODE               1
#define AIPTEK_POINTER_EITHER_MODE              2

#define AIPTEK_POINTER_ALLOW_MOUSE_MODE(a)            \
      (a == AIPTEK_POINTER_ONLY_MOUSE_MODE ||         \
       a == AIPTEK_POINTER_EITHER_MODE)
#define AIPTEK_POINTER_ALLOW_STYLUS_MODE(a)           \
      (a == AIPTEK_POINTER_ONLY_STYLUS_MODE ||  \
       a == AIPTEK_POINTER_EITHER_MODE)

      /* CoordinateMode code
       */
#define AIPTEK_COORDINATE_RELATIVE_MODE               0
#define AIPTEK_COORDINATE_ABSOLUTE_MODE               1

       /* XTilt and YTilt values
        */
#define AIPTEK_TILT_MIN                         (-128)
#define AIPTEK_TILT_MAX                         127
#define AIPTEK_TILT_DISABLE                     (-10101)

      /* Wheel values
       */
#define AIPTEK_WHEEL_MIN                        0
#define AIPTEK_WHEEL_MAX                        1024
#define AIPTEK_WHEEL_DISABLE                    (-10101)

      /* ToolCode values, which BTW are 0x140 .. 0x14f
       * We have things set up such that if the tool button has changed,
       * the tools get reset.
       */
      /* toolMode codes
       */
#define AIPTEK_TOOL_BUTTON_PEN_MODE             BTN_TOOL_PEN
#define AIPTEK_TOOL_BUTTON_PEN_MODE             BTN_TOOL_PEN
#define AIPTEK_TOOL_BUTTON_PENCIL_MODE                BTN_TOOL_PENCIL
#define AIPTEK_TOOL_BUTTON_BRUSH_MODE                 BTN_TOOL_BRUSH
#define AIPTEK_TOOL_BUTTON_AIRBRUSH_MODE        BTN_TOOL_AIRBRUSH
#define AIPTEK_TOOL_BUTTON_ERASER_MODE                BTN_TOOL_RUBBER
#define AIPTEK_TOOL_BUTTON_MOUSE_MODE                 BTN_TOOL_MOUSE
#define AIPTEK_TOOL_BUTTON_LENS_MODE                  BTN_TOOL_LENS

      /* Diagnostic message codes
       */
#define AIPTEK_DIAGNOSTIC_NA                    0
#define AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE      1
#define AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE      2
#define AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED       3

      /* Time to wait (in ms) to help mask hand jittering
       * when pressing the stylus buttons.
       */
#define AIPTEK_JITTER_DELAY_DEFAULT             50

      /* Time to wait (in ms) in-between sending the tablet
       * a command and beginning the process of reading the return
       * sequence from the tablet.
       */
#define AIPTEK_PROGRAMMABLE_DELAY_25            25
#define AIPTEK_PROGRAMMABLE_DELAY_50            50
#define AIPTEK_PROGRAMMABLE_DELAY_100           100
#define AIPTEK_PROGRAMMABLE_DELAY_200           200
#define AIPTEK_PROGRAMMABLE_DELAY_300           300
#define AIPTEK_PROGRAMMABLE_DELAY_400           400
#define AIPTEK_PROGRAMMABLE_DELAY_DEFAULT AIPTEK_PROGRAMMABLE_DELAY_400

      /* Mouse button programming
       */
#define AIPTEK_MOUSE_LEFT_BUTTON          0x04
#define AIPTEK_MOUSE_RIGHT_BUTTON         0x08
#define AIPTEK_MOUSE_MIDDLE_BUTTON        0x10

      /* Stylus button programming
       */
#define AIPTEK_STYLUS_LOWER_BUTTON        0x08
#define AIPTEK_STYLUS_UPPER_BUTTON        0x10

      /* Length of incoming packet from the tablet
       */
#define AIPTEK_PACKET_LENGTH              8

      /* We report in EV_MISC both the proximity and
       * whether the report came from the stylus, tablet mouse
       * or "unknown" -- Unknown when the tablet is in relative
       * mode, because we only get report 1's.
       */
#define AIPTEK_REPORT_TOOL_UNKNOWN        0x10
#define AIPTEK_REPORT_TOOL_STYLUS         0x20
#define AIPTEK_REPORT_TOOL_MOUSE          0x40

static int programmableDelay = AIPTEK_PROGRAMMABLE_DELAY_DEFAULT;
static int jitterDelay = AIPTEK_JITTER_DELAY_DEFAULT;

struct aiptek_features {
      int odmCode;            /* Tablet manufacturer code       */
      int modelCode;          /* Tablet model code (not unique) */
      int firmwareCode; /* prom/eeprom version            */
      char usbPath[64 + 1];   /* device's physical usb path     */
};

struct aiptek_settings {
      int pointerMode;  /* stylus-, mouse-only or either */
      int coordinateMode;     /* absolute/relative coords      */
      int toolMode;           /* pen, pencil, brush, etc. tool */
      int xTilt;        /* synthetic xTilt amount        */
      int yTilt;        /* synthetic yTilt amount        */
      int wheel;        /* synthetic wheel amount        */
      int stylusButtonUpper;  /* stylus upper btn delivers...  */
      int stylusButtonLower;  /* stylus lower btn delivers...  */
      int mouseButtonLeft;    /* mouse left btn delivers...    */
      int mouseButtonMiddle;  /* mouse middle btn delivers...  */
      int mouseButtonRight;   /* mouse right btn delivers...   */
      int programmableDelay;  /* delay for tablet programming  */
      int jitterDelay;  /* delay for hand jittering      */
};

struct aiptek {
      struct input_dev *inputdev;         /* input device struct           */
      struct usb_device *usbdev;          /* usb device struct             */
      struct urb *urb;              /* urb for incoming reports      */
      dma_addr_t data_dma;                /* our dma stuffage              */
      struct aiptek_features features;    /* tablet's array of features    */
      struct aiptek_settings curSetting;  /* tablet's current programmable */
      struct aiptek_settings newSetting;  /* ... and new param settings    */
      unsigned int ifnum;                 /* interface number for IO       */
      int diagnostic;                     /* tablet diagnostic codes       */
      unsigned long eventCount;           /* event count                   */
      int inDelay;                        /* jitter: in jitter delay?      */
      unsigned long endDelay;             /* jitter: time when delay ends  */
      int previousJitterable;             /* jitterable prev value     */

      int lastMacro;                      /* macro key to reset            */
      int previousToolMode;               /* pen, pencil, brush, etc. tool */
      unsigned char *data;                /* incoming packet data          */
};

static const int eventTypes[] = {
        EV_KEY, EV_ABS, EV_REL, EV_MSC,
};

static const int absEvents[] = {
        ABS_X, ABS_Y, ABS_PRESSURE, ABS_TILT_X, ABS_TILT_Y,
        ABS_WHEEL, ABS_MISC,
};

static const int relEvents[] = {
        REL_X, REL_Y, REL_WHEEL,
};

static const int buttonEvents[] = {
      BTN_LEFT, BTN_RIGHT, BTN_MIDDLE,
      BTN_TOOL_PEN, BTN_TOOL_RUBBER, BTN_TOOL_PENCIL, BTN_TOOL_AIRBRUSH,
      BTN_TOOL_BRUSH, BTN_TOOL_MOUSE, BTN_TOOL_LENS, BTN_TOUCH,
      BTN_STYLUS, BTN_STYLUS2,
};

/*
 * Permit easy lookup of keyboard events to send, versus
 * the bitmap which comes from the tablet. This hides the
 * issue that the F_keys are not sequentially numbered.
 */
static const int macroKeyEvents[] = {
      KEY_ESC, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5,
      KEY_F6, KEY_F7, KEY_F8, KEY_F9, KEY_F10, KEY_F11,
      KEY_F12, KEY_F13, KEY_F14, KEY_F15, KEY_F16, KEY_F17,
      KEY_F18, KEY_F19, KEY_F20, KEY_F21, KEY_F22, KEY_F23,
      KEY_F24, KEY_STOP, KEY_AGAIN, KEY_PROPS, KEY_UNDO,
      KEY_FRONT, KEY_COPY, KEY_OPEN, KEY_PASTE, 0
};

/***********************************************************************
 * Map values to strings and back. Every map shoudl have the following
 * as its last element: { NULL, AIPTEK_INVALID_VALUE }.
 */
#define AIPTEK_INVALID_VALUE  -1

struct aiptek_map {
      const char *string;
      int value;
};

static int map_str_to_val(const struct aiptek_map *map, const char *str, size_t count)
{
      const struct aiptek_map *p;

      if (str[count - 1] == '\n')
            count--;

      for (p = map; p->string; p++)
              if (!strncmp(str, p->string, count))
                  return p->value;

      return AIPTEK_INVALID_VALUE;
}

static const char *map_val_to_str(const struct aiptek_map *map, int val)
{
      const struct aiptek_map *p;

      for (p = map; p->value != AIPTEK_INVALID_VALUE; p++)
            if (val == p->value)
                  return p->string;

      return "unknown";
}

/***********************************************************************
 * aiptek_irq can receive one of six potential reports.
 * The documentation for each is in the body of the function.
 *
 * The tablet reports on several attributes per invocation of
 * aiptek_irq. Because the Linux Input Event system allows the
 * transmission of ONE attribute per input_report_xxx() call,
 * collation has to be done on the other end to reconstitute
 * a complete tablet report. Further, the number of Input Event reports
 * submitted varies, depending on what USB report type, and circumstance.
 * To deal with this, EV_MSC is used to indicate an 'end-of-report'
 * message. This has been an undocumented convention understood by the kernel
 * tablet driver and clients such as gpm and XFree86's tablet drivers.
 *
 * Of the information received from the tablet, the one piece I
 * cannot transmit is the proximity bit (without resorting to an EV_MSC
 * convention above.) I therefore have taken over REL_MISC and ABS_MISC
 * (for relative and absolute reports, respectively) for communicating
 * Proximity. Why two events? I thought it interesting to know if the
 * Proximity event occurred while the tablet was in absolute or relative
 * mode.
 * Update: REL_MISC proved not to be such a good idea. With REL_MISC you
 * get an event transmitted each time. ABS_MISC works better, since it
 * can be set and re-set. Thus, only using ABS_MISC from now on.
 *
 * Other tablets use the notion of a certain minimum stylus pressure
 * to infer proximity. While that could have been done, that is yet
 * another 'by convention' behavior, the documentation for which
 * would be spread between two (or more) pieces of software.
 *
 * EV_MSC usage was terminated for this purpose in Linux 2.5.x, and
 * replaced with the input_sync() method (which emits EV_SYN.)
 */

static void aiptek_irq(struct urb *urb)
{
      struct aiptek *aiptek = urb->context;
      unsigned char *data = aiptek->data;
      struct input_dev *inputdev = aiptek->inputdev;
      int jitterable = 0;
      int retval, macro, x, y, z, left, right, middle, p, dv, tip, bs, pck;

      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;
      }

      /* See if we are in a delay loop -- throw out report if true.
       */
      if (aiptek->inDelay == 1 && time_after(aiptek->endDelay, jiffies)) {
            goto exit;
      }

      aiptek->inDelay = 0;
      aiptek->eventCount++;

      /* Report 1 delivers relative coordinates with either a stylus
       * or the mouse. You do not know, however, which input
       * tool generated the event.
       */
      if (data[0] == 1) {
            if (aiptek->curSetting.coordinateMode ==
                AIPTEK_COORDINATE_ABSOLUTE_MODE) {
                  aiptek->diagnostic =
                      AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE;
            } else {
                  x = (signed char) data[2];
                  y = (signed char) data[3];

                  /* jitterable keeps track of whether any button has been pressed.
                   * We're also using it to remap the physical mouse button mask
                   * to pseudo-settings. (We don't specifically care about it's
                   * value after moving/transposing mouse button bitmasks, except
                   * that a non-zero value indicates that one or more
                   * mouse button was pressed.)
                   */
                  jitterable = data[1] & 0x07;

                  left = (data[1] & aiptek->curSetting.mouseButtonLeft >> 2) != 0 ? 1 : 0;
                  right = (data[1] & aiptek->curSetting.mouseButtonRight >> 2) != 0 ? 1 : 0;
                  middle = (data[1] & aiptek->curSetting.mouseButtonMiddle >> 2) != 0 ? 1 : 0;

                  input_report_key(inputdev, BTN_LEFT, left);
                  input_report_key(inputdev, BTN_MIDDLE, middle);
                  input_report_key(inputdev, BTN_RIGHT, right);

                  input_report_abs(inputdev, ABS_MISC,
                               1 | AIPTEK_REPORT_TOOL_UNKNOWN);
                  input_report_rel(inputdev, REL_X, x);
                  input_report_rel(inputdev, REL_Y, y);

                  /* Wheel support is in the form of a single-event
                   * firing.
                   */
                  if (aiptek->curSetting.wheel != AIPTEK_WHEEL_DISABLE) {
                        input_report_rel(inputdev, REL_WHEEL,
                                     aiptek->curSetting.wheel);
                        aiptek->curSetting.wheel = AIPTEK_WHEEL_DISABLE;
                  }
                  if (aiptek->lastMacro != -1) {
                          input_report_key(inputdev,
                                     macroKeyEvents[aiptek->lastMacro], 0);
                        aiptek->lastMacro = -1;
                  }
                  input_sync(inputdev);
            }
      }
      /* Report 2 is delivered only by the stylus, and delivers
       * absolute coordinates.
       */
      else if (data[0] == 2) {
            if (aiptek->curSetting.coordinateMode == AIPTEK_COORDINATE_RELATIVE_MODE) {
                  aiptek->diagnostic = AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE;
            } else if (!AIPTEK_POINTER_ALLOW_STYLUS_MODE
                      (aiptek->curSetting.pointerMode)) {
                        aiptek->diagnostic = AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED;
            } else {
                  x = le16_to_cpu(get_unaligned((__le16 *) (data + 1)));
                  y = le16_to_cpu(get_unaligned((__le16 *) (data + 3)));
                  z = le16_to_cpu(get_unaligned((__le16 *) (data + 6)));

                  dv = (data[5] & 0x01) != 0 ? 1 : 0;
                  p = (data[5] & 0x02) != 0 ? 1 : 0;
                  tip = (data[5] & 0x04) != 0 ? 1 : 0;

                  /* Use jitterable to re-arrange button masks
                   */
                  jitterable = data[5] & 0x18;

                  bs = (data[5] & aiptek->curSetting.stylusButtonLower) != 0 ? 1 : 0;
                  pck = (data[5] & aiptek->curSetting.stylusButtonUpper) != 0 ? 1 : 0;

                  /* dv indicates 'data valid' (e.g., the tablet is in sync
                   * and has delivered a "correct" report) We will ignore
                   * all 'bad' reports...
                   */
                  if (dv != 0) {
                        /* If the selected tool changed, reset the old
                         * tool key, and set the new one.
                         */
                        if (aiptek->previousToolMode !=
                            aiptek->curSetting.toolMode) {
                                input_report_key(inputdev,
                                           aiptek->previousToolMode, 0);
                              input_report_key(inputdev,
                                           aiptek->curSetting.toolMode,
                                           1);
                              aiptek->previousToolMode =
                                        aiptek->curSetting.toolMode;
                        }

                        if (p != 0) {
                              input_report_abs(inputdev, ABS_X, x);
                              input_report_abs(inputdev, ABS_Y, y);
                              input_report_abs(inputdev, ABS_PRESSURE, z);

                              input_report_key(inputdev, BTN_TOUCH, tip);
                              input_report_key(inputdev, BTN_STYLUS, bs);
                              input_report_key(inputdev, BTN_STYLUS2, pck);

                              if (aiptek->curSetting.xTilt !=
                                  AIPTEK_TILT_DISABLE) {
                                    input_report_abs(inputdev,
                                                 ABS_TILT_X,
                                                 aiptek->curSetting.xTilt);
                              }
                              if (aiptek->curSetting.yTilt != AIPTEK_TILT_DISABLE) {
                                    input_report_abs(inputdev,
                                                 ABS_TILT_Y,
                                                 aiptek->curSetting.yTilt);
                              }

                              /* Wheel support is in the form of a single-event
                               * firing.
                               */
                              if (aiptek->curSetting.wheel !=
                                  AIPTEK_WHEEL_DISABLE) {
                                    input_report_abs(inputdev,
                                                 ABS_WHEEL,
                                                 aiptek->curSetting.wheel);
                                    aiptek->curSetting.wheel = AIPTEK_WHEEL_DISABLE;
                              }
                        }
                        input_report_abs(inputdev, ABS_MISC, p | AIPTEK_REPORT_TOOL_STYLUS);
                        if (aiptek->lastMacro != -1) {
                                  input_report_key(inputdev,
                                           macroKeyEvents[aiptek->lastMacro], 0);
                              aiptek->lastMacro = -1;
                        }
                        input_sync(inputdev);
                  }
            }
      }
      /* Report 3's come from the mouse in absolute mode.
       */
      else if (data[0] == 3) {
            if (aiptek->curSetting.coordinateMode == AIPTEK_COORDINATE_RELATIVE_MODE) {
                  aiptek->diagnostic = AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE;
            } else if (!AIPTEK_POINTER_ALLOW_MOUSE_MODE
                  (aiptek->curSetting.pointerMode)) {
                  aiptek->diagnostic = AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED;
            } else {
                  x = le16_to_cpu(get_unaligned((__le16 *) (data + 1)));
                  y = le16_to_cpu(get_unaligned((__le16 *) (data + 3)));

                  jitterable = data[5] & 0x1c;

                  dv = (data[5] & 0x01) != 0 ? 1 : 0;
                  p = (data[5] & 0x02) != 0 ? 1 : 0;
                  left = (data[5] & aiptek->curSetting.mouseButtonLeft) != 0 ? 1 : 0;
                  right = (data[5] & aiptek->curSetting.mouseButtonRight) != 0 ? 1 : 0;
                  middle = (data[5] & aiptek->curSetting.mouseButtonMiddle) != 0 ? 1 : 0;

                  if (dv != 0) {
                        /* If the selected tool changed, reset the old
                         * tool key, and set the new one.
                         */
                        if (aiptek->previousToolMode !=
                            aiptek->curSetting.toolMode) {
                                input_report_key(inputdev,
                                           aiptek->previousToolMode, 0);
                              input_report_key(inputdev,
                                           aiptek->curSetting.toolMode,
                                           1);
                              aiptek->previousToolMode =
                                        aiptek->curSetting.toolMode;
                        }

                        if (p != 0) {
                              input_report_abs(inputdev, ABS_X, x);
                              input_report_abs(inputdev, ABS_Y, y);

                              input_report_key(inputdev, BTN_LEFT, left);
                              input_report_key(inputdev, BTN_MIDDLE, middle);
                              input_report_key(inputdev, BTN_RIGHT, right);

                              /* Wheel support is in the form of a single-event
                               * firing.
                               */
                              if (aiptek->curSetting.wheel != AIPTEK_WHEEL_DISABLE) {
                                    input_report_abs(inputdev,
                                                 ABS_WHEEL,
                                                 aiptek->curSetting.wheel);
                                    aiptek->curSetting.wheel = AIPTEK_WHEEL_DISABLE;
                              }
                        }
                        input_report_abs(inputdev, ABS_MISC, p | AIPTEK_REPORT_TOOL_MOUSE);
                        if (aiptek->lastMacro != -1) {
                                  input_report_key(inputdev,
                                           macroKeyEvents[aiptek->lastMacro], 0);
                                aiptek->lastMacro = -1;
                        }
                        input_sync(inputdev);
                  }
            }
      }
      /* Report 4s come from the macro keys when pressed by stylus
       */
      else if (data[0] == 4) {
            jitterable = data[1] & 0x18;

            dv = (data[1] & 0x01) != 0 ? 1 : 0;
            p = (data[1] & 0x02) != 0 ? 1 : 0;
            tip = (data[1] & 0x04) != 0 ? 1 : 0;
            bs = (data[1] & aiptek->curSetting.stylusButtonLower) != 0 ? 1 : 0;
            pck = (data[1] & aiptek->curSetting.stylusButtonUpper) != 0 ? 1 : 0;

            macro = dv && p && tip && !(data[3] & 1) ? (data[3] >> 1) : -1;
            z = le16_to_cpu(get_unaligned((__le16 *) (data + 4)));

            if (dv) {
                    /* If the selected tool changed, reset the old
                   * tool key, and set the new one.
                   */
                    if (aiptek->previousToolMode !=
                      aiptek->curSetting.toolMode) {
                          input_report_key(inputdev,
                                     aiptek->previousToolMode, 0);
                        input_report_key(inputdev,
                                     aiptek->curSetting.toolMode,
                                     1);
                        aiptek->previousToolMode =
                                aiptek->curSetting.toolMode;
                  }
            }

            if (aiptek->lastMacro != -1 && aiptek->lastMacro != macro) {
                    input_report_key(inputdev, macroKeyEvents[aiptek->lastMacro], 0);
                  aiptek->lastMacro = -1;
            }

            if (macro != -1 && macro != aiptek->lastMacro) {
                  input_report_key(inputdev, macroKeyEvents[macro], 1);
                  aiptek->lastMacro = macro;
            }
            input_report_abs(inputdev, ABS_MISC,
                         p | AIPTEK_REPORT_TOOL_STYLUS);
            input_sync(inputdev);
      }
      /* Report 5s come from the macro keys when pressed by mouse
       */
      else if (data[0] == 5) {
            jitterable = data[1] & 0x1c;

            dv = (data[1] & 0x01) != 0 ? 1 : 0;
            p = (data[1] & 0x02) != 0 ? 1 : 0;
            left = (data[1]& aiptek->curSetting.mouseButtonLeft) != 0 ? 1 : 0;
            right = (data[1] & aiptek->curSetting.mouseButtonRight) != 0 ? 1 : 0;
            middle = (data[1] & aiptek->curSetting.mouseButtonMiddle) != 0 ? 1 : 0;
            macro = dv && p && left && !(data[3] & 1) ? (data[3] >> 1) : 0;

            if (dv) {
                    /* If the selected tool changed, reset the old
                   * tool key, and set the new one.
                   */
                    if (aiptek->previousToolMode !=
                      aiptek->curSetting.toolMode) {
                            input_report_key(inputdev,
                                     aiptek->previousToolMode, 0);
                          input_report_key(inputdev,
                                     aiptek->curSetting.toolMode, 1);
                          aiptek->previousToolMode = aiptek->curSetting.toolMode;
                  }
            }

            if (aiptek->lastMacro != -1 && aiptek->lastMacro != macro) {
                    input_report_key(inputdev, macroKeyEvents[aiptek->lastMacro], 0);
                  aiptek->lastMacro = -1;
            }

            if (macro != -1 && macro != aiptek->lastMacro) {
                  input_report_key(inputdev, macroKeyEvents[macro], 1);
                  aiptek->lastMacro = macro;
            }

            input_report_abs(inputdev, ABS_MISC,
                         p | AIPTEK_REPORT_TOOL_MOUSE);
            input_sync(inputdev);
      }
      /* We have no idea which tool can generate a report 6. Theoretically,
       * neither need to, having been given reports 4 & 5 for such use.
       * However, report 6 is the 'official-looking' report for macroKeys;
       * reports 4 & 5 supposively are used to support unnamed, unknown
       * hat switches (which just so happen to be the macroKeys.)
       */
      else if (data[0] == 6) {
            macro = le16_to_cpu(get_unaligned((__le16 *) (data + 1)));
            if (macro > 0) {
                  input_report_key(inputdev, macroKeyEvents[macro - 1],
                               0);
            }
            if (macro < 25) {
                  input_report_key(inputdev, macroKeyEvents[macro + 1],
                               0);
            }

            /* If the selected tool changed, reset the old
               tool key, and set the new one.
            */
            if (aiptek->previousToolMode !=
                aiptek->curSetting.toolMode) {
                    input_report_key(inputdev,
                               aiptek->previousToolMode, 0);
                  input_report_key(inputdev,
                               aiptek->curSetting.toolMode,
                               1);
                  aiptek->previousToolMode =
                        aiptek->curSetting.toolMode;
            }

            input_report_key(inputdev, macroKeyEvents[macro], 1);
            input_report_abs(inputdev, ABS_MISC,
                         1 | AIPTEK_REPORT_TOOL_UNKNOWN);
            input_sync(inputdev);
      } else {
            dbg("Unknown report %d", data[0]);
      }

      /* Jitter may occur when the user presses a button on the stlyus
       * or the mouse. What we do to prevent that is wait 'x' milliseconds
       * following a 'jitterable' event, which should give the hand some time
       * stabilize itself.
       *
       * We just introduced aiptek->previousJitterable to carry forth the
       * notion that jitter occurs when the button state changes from on to off:
       * a person drawing, holding a button down is not subject to jittering.
       * With that in mind, changing from upper button depressed to lower button
       * WILL transition through a jitter delay.
       */

      if (aiptek->previousJitterable != jitterable &&
          aiptek->curSetting.jitterDelay != 0 && aiptek->inDelay != 1) {
            aiptek->endDelay = jiffies +
                ((aiptek->curSetting.jitterDelay * HZ) / 1000);
            aiptek->inDelay = 1;
      }
      aiptek->previousJitterable = jitterable;

exit:
      retval = usb_submit_urb(urb, GFP_ATOMIC);
      if (retval != 0) {
            err("%s - usb_submit_urb failed with result %d",
                __FUNCTION__, retval);
      }
}

/***********************************************************************
 * These are the USB id's known so far. We do not identify them to
 * specific Aiptek model numbers, because there has been overlaps,
 * use, and reuse of id's in existing models. Certain models have
 * been known to use more than one ID, indicative perhaps of
 * manufacturing revisions. In any event, we consider these
 * IDs to not be model-specific nor unique.
 */
static const struct usb_device_id aiptek_ids[] = {
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x01)},
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x10)},
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x20)},
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x21)},
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x22)},
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x23)},
      {USB_DEVICE(USB_VENDOR_ID_AIPTEK, 0x24)},
      {}
};

MODULE_DEVICE_TABLE(usb, aiptek_ids);

/***********************************************************************
 * Open an instance of the tablet driver.
 */
static int aiptek_open(struct input_dev *inputdev)
{
      struct aiptek *aiptek = input_get_drvdata(inputdev);

      aiptek->urb->dev = aiptek->usbdev;
      if (usb_submit_urb(aiptek->urb, GFP_KERNEL) != 0)
            return -EIO;

      return 0;
}

/***********************************************************************
 * Close an instance of the tablet driver.
 */
static void aiptek_close(struct input_dev *inputdev)
{
      struct aiptek *aiptek = input_get_drvdata(inputdev);

      usb_kill_urb(aiptek->urb);
}

/***********************************************************************
 * aiptek_set_report and aiptek_get_report() are borrowed from Linux 2.4.x,
 * where they were known as usb_set_report and usb_get_report.
 */
static int
aiptek_set_report(struct aiptek *aiptek,
              unsigned char report_type,
              unsigned char report_id, void *buffer, int size)
{
      return usb_control_msg(aiptek->usbdev,
                         usb_sndctrlpipe(aiptek->usbdev, 0),
                         USB_REQ_SET_REPORT,
                         USB_TYPE_CLASS | USB_RECIP_INTERFACE |
                         USB_DIR_OUT, (report_type << 8) + report_id,
                         aiptek->ifnum, buffer, size, 5000);
}

static int
aiptek_get_report(struct aiptek *aiptek,
              unsigned char report_type,
              unsigned char report_id, void *buffer, int size)
{
      return usb_control_msg(aiptek->usbdev,
                         usb_rcvctrlpipe(aiptek->usbdev, 0),
                         USB_REQ_GET_REPORT,
                         USB_TYPE_CLASS | USB_RECIP_INTERFACE |
                         USB_DIR_IN, (report_type << 8) + report_id,
                         aiptek->ifnum, buffer, size, 5000);
}

/***********************************************************************
 * Send a command to the tablet.
 */
static int
aiptek_command(struct aiptek *aiptek, unsigned char command, unsigned char data)
{
      const int sizeof_buf = 3 * sizeof(u8);
      int ret;
      u8 *buf;

      buf = kmalloc(sizeof_buf, GFP_KERNEL);
      if (!buf)
            return -ENOMEM;

      buf[0] = 2;
      buf[1] = command;
      buf[2] = data;

      if ((ret =
           aiptek_set_report(aiptek, 3, 2, buf, sizeof_buf)) != sizeof_buf) {
            dbg("aiptek_program: failed, tried to send: 0x%02x 0x%02x",
                command, data);
      }
      kfree(buf);
      return ret < 0 ? ret : 0;
}

/***********************************************************************
 * Retrieve information from the tablet. Querying info is defined as first
 * sending the {command,data} sequence as a command, followed by a wait
 * (aka, "programmaticDelay") and then a "read" request.
 */
static int
aiptek_query(struct aiptek *aiptek, unsigned char command, unsigned char data)
{
      const int sizeof_buf = 3 * sizeof(u8);
      int ret;
      u8 *buf;

      buf = kmalloc(sizeof_buf, GFP_KERNEL);
      if (!buf)
            return -ENOMEM;

      buf[0] = 2;
      buf[1] = command;
      buf[2] = data;

      if (aiptek_command(aiptek, command, data) != 0) {
            kfree(buf);
            return -EIO;
      }
      msleep(aiptek->curSetting.programmableDelay);

      if ((ret =
           aiptek_get_report(aiptek, 3, 2, buf, sizeof_buf)) != sizeof_buf) {
            dbg("aiptek_query failed: returned 0x%02x 0x%02x 0x%02x",
                buf[0], buf[1], buf[2]);
            ret = -EIO;
      } else {
            ret = le16_to_cpu(get_unaligned((__le16 *) (buf + 1)));
      }
      kfree(buf);
      return ret;
}

/***********************************************************************
 * Program the tablet into either absolute or relative mode.
 * We also get information about the tablet's size.
 */
static int aiptek_program_tablet(struct aiptek *aiptek)
{
      int ret;
      /* Execute Resolution500LPI */
      if ((ret = aiptek_command(aiptek, 0x18, 0x04)) < 0)
            return ret;

      /* Query getModelCode */
      if ((ret = aiptek_query(aiptek, 0x02, 0x00)) < 0)
            return ret;
      aiptek->features.modelCode = ret & 0xff;

      /* Query getODMCode */
      if ((ret = aiptek_query(aiptek, 0x03, 0x00)) < 0)
            return ret;
      aiptek->features.odmCode = ret;

      /* Query getFirmwareCode */
      if ((ret = aiptek_query(aiptek, 0x04, 0x00)) < 0)
            return ret;
      aiptek->features.firmwareCode = ret;

      /* Query getXextension */
      if ((ret = aiptek_query(aiptek, 0x01, 0x00)) < 0)
            return ret;
      aiptek->inputdev->absmin[ABS_X] = 0;
      aiptek->inputdev->absmax[ABS_X] = ret - 1;

      /* Query getYextension */
      if ((ret = aiptek_query(aiptek, 0x01, 0x01)) < 0)
            return ret;
      aiptek->inputdev->absmin[ABS_Y] = 0;
      aiptek->inputdev->absmax[ABS_Y] = ret - 1;

      /* Query getPressureLevels */
      if ((ret = aiptek_query(aiptek, 0x08, 0x00)) < 0)
            return ret;
      aiptek->inputdev->absmin[ABS_PRESSURE] = 0;
      aiptek->inputdev->absmax[ABS_PRESSURE] = ret - 1;

      /* Depending on whether we are in absolute or relative mode, we will
       * do a switchToTablet(absolute) or switchToMouse(relative) command.
       */
      if (aiptek->curSetting.coordinateMode ==
          AIPTEK_COORDINATE_ABSOLUTE_MODE) {
            /* Execute switchToTablet */
            if ((ret = aiptek_command(aiptek, 0x10, 0x01)) < 0) {
                  return ret;
            }
      } else {
            /* Execute switchToMouse */
            if ((ret = aiptek_command(aiptek, 0x10, 0x00)) < 0) {
                  return ret;
            }
      }

      /* Enable the macro keys */
      if ((ret = aiptek_command(aiptek, 0x11, 0x02)) < 0)
            return ret;
#if 0
      /* Execute FilterOn */
      if ((ret = aiptek_command(aiptek, 0x17, 0x00)) < 0)
            return ret;
#endif

      /* Execute AutoGainOn */
      if ((ret = aiptek_command(aiptek, 0x12, 0xff)) < 0)
            return ret;

      /* Reset the eventCount, so we track events from last (re)programming
       */
      aiptek->diagnostic = AIPTEK_DIAGNOSTIC_NA;
      aiptek->eventCount = 0;

      return 0;
}

/***********************************************************************
 * Sysfs functions. Sysfs prefers that individually-tunable parameters
 * exist in their separate pseudo-files. Summary data that is immutable
 * may exist in a singular file so long as you don't define a writeable
 * interface.
 */

/***********************************************************************
 * support the 'size' file -- display support
 */
static ssize_t show_tabletSize(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%dx%d\n",
                  aiptek->inputdev->absmax[ABS_X] + 1,
                  aiptek->inputdev->absmax[ABS_Y] + 1);
}

/* These structs define the sysfs files, param #1 is the name of the
 * file, param 2 is the file permissions, param 3 & 4 are to the
 * output generator and input parser routines. Absence of a routine is
 * permitted -- it only means can't either 'cat' the file, or send data
 * to it.
 */
static DEVICE_ATTR(size, S_IRUGO, show_tabletSize, NULL);

/***********************************************************************
 * support routines for the 'pointer_mode' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static struct aiptek_map pointer_mode_map[] = {
      { "stylus", AIPTEK_POINTER_ONLY_STYLUS_MODE },
      { "mouse",  AIPTEK_POINTER_ONLY_MOUSE_MODE },
      { "either", AIPTEK_POINTER_EITHER_MODE },
      { NULL,           AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletPointerMode(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(pointer_mode_map,
                              aiptek->curSetting.pointerMode));
}

static ssize_t
store_tabletPointerMode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_mode = map_str_to_val(pointer_mode_map, buf, count);

      if (new_mode == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.pointerMode = new_mode;
      return count;
}

static DEVICE_ATTR(pointer_mode,
               S_IRUGO | S_IWUGO,
               show_tabletPointerMode, store_tabletPointerMode);

/***********************************************************************
 * support routines for the 'coordinate_mode' file. Note that this file
 * both displays current setting and allows reprogramming.
 */

static struct aiptek_map coordinate_mode_map[] = {
      { "absolute",     AIPTEK_COORDINATE_ABSOLUTE_MODE },
      { "relative",     AIPTEK_COORDINATE_RELATIVE_MODE },
      { NULL,           AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletCoordinateMode(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(coordinate_mode_map,
                              aiptek->curSetting.coordinateMode));
}

static ssize_t
store_tabletCoordinateMode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_mode = map_str_to_val(coordinate_mode_map, buf, count);

      if (new_mode == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.coordinateMode = new_mode;
      return count;
}

static DEVICE_ATTR(coordinate_mode,
               S_IRUGO | S_IWUGO,
               show_tabletCoordinateMode, store_tabletCoordinateMode);

/***********************************************************************
 * support routines for the 'tool_mode' file. Note that this file
 * both displays current setting and allows reprogramming.
 */

static struct aiptek_map tool_mode_map[] = {
      { "mouse",  AIPTEK_TOOL_BUTTON_MOUSE_MODE },
      { "eraser", AIPTEK_TOOL_BUTTON_ERASER_MODE },
      { "pencil", AIPTEK_TOOL_BUTTON_PENCIL_MODE },
      { "pen",    AIPTEK_TOOL_BUTTON_PEN_MODE },
      { "brush",  AIPTEK_TOOL_BUTTON_BRUSH_MODE },
      { "airbrush",     AIPTEK_TOOL_BUTTON_AIRBRUSH_MODE },
      { "lens",   AIPTEK_TOOL_BUTTON_LENS_MODE },
      { NULL,           AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletToolMode(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(tool_mode_map,
                              aiptek->curSetting.toolMode));
}

static ssize_t
store_tabletToolMode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_mode = map_str_to_val(tool_mode_map, buf, count);

      if (new_mode == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.toolMode = new_mode;
      return count;
}

static DEVICE_ATTR(tool_mode,
               S_IRUGO | S_IWUGO,
               show_tabletToolMode, store_tabletToolMode);

/***********************************************************************
 * support routines for the 'xtilt' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletXtilt(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      if (aiptek->curSetting.xTilt == AIPTEK_TILT_DISABLE) {
            return snprintf(buf, PAGE_SIZE, "disable\n");
      } else {
            return snprintf(buf, PAGE_SIZE, "%d\n",
                        aiptek->curSetting.xTilt);
      }
}

static ssize_t
store_tabletXtilt(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int x;

      if (strcmp(buf, "disable") == 0) {
            aiptek->newSetting.xTilt = AIPTEK_TILT_DISABLE;
      } else {
            x = (int)simple_strtol(buf, NULL, 10);
            if (x >= AIPTEK_TILT_MIN && x <= AIPTEK_TILT_MAX) {
                  aiptek->newSetting.xTilt = x;
            }
      }
      return count;
}

static DEVICE_ATTR(xtilt,
               S_IRUGO | S_IWUGO, show_tabletXtilt, store_tabletXtilt);

/***********************************************************************
 * support routines for the 'ytilt' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletYtilt(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      if (aiptek->curSetting.yTilt == AIPTEK_TILT_DISABLE) {
            return snprintf(buf, PAGE_SIZE, "disable\n");
      } else {
            return snprintf(buf, PAGE_SIZE, "%d\n",
                        aiptek->curSetting.yTilt);
      }
}

static ssize_t
store_tabletYtilt(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int y;

      if (strcmp(buf, "disable") == 0) {
            aiptek->newSetting.yTilt = AIPTEK_TILT_DISABLE;
      } else {
            y = (int)simple_strtol(buf, NULL, 10);
            if (y >= AIPTEK_TILT_MIN && y <= AIPTEK_TILT_MAX) {
                  aiptek->newSetting.yTilt = y;
            }
      }
      return count;
}

static DEVICE_ATTR(ytilt,
               S_IRUGO | S_IWUGO, show_tabletYtilt, store_tabletYtilt);

/***********************************************************************
 * support routines for the 'jitter' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletJitterDelay(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%d\n", aiptek->curSetting.jitterDelay);
}

static ssize_t
store_tabletJitterDelay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      aiptek->newSetting.jitterDelay = (int)simple_strtol(buf, NULL, 10);
      return count;
}

static DEVICE_ATTR(jitter,
               S_IRUGO | S_IWUGO,
               show_tabletJitterDelay, store_tabletJitterDelay);

/***********************************************************************
 * support routines for the 'delay' file. Note that this file
 * both displays current setting and allows reprogramming.
 */
static ssize_t show_tabletProgrammableDelay(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%d\n",
                  aiptek->curSetting.programmableDelay);
}

static ssize_t
store_tabletProgrammableDelay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      aiptek->newSetting.programmableDelay = (int)simple_strtol(buf, NULL, 10);
      return count;
}

static DEVICE_ATTR(delay,
               S_IRUGO | S_IWUGO,
               show_tabletProgrammableDelay, store_tabletProgrammableDelay);

/***********************************************************************
 * support routines for the 'event_count' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletEventsReceived(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%ld\n", aiptek->eventCount);
}

static DEVICE_ATTR(event_count, S_IRUGO, show_tabletEventsReceived, NULL);

/***********************************************************************
 * support routines for the 'diagnostic' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletDiagnosticMessage(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      char *retMsg;

      switch (aiptek->diagnostic) {
      case AIPTEK_DIAGNOSTIC_NA:
            retMsg = "no errors\n";
            break;

      case AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE:
            retMsg = "Error: receiving relative reports\n";
            break;

      case AIPTEK_DIAGNOSTIC_SENDING_ABSOLUTE_IN_RELATIVE:
            retMsg = "Error: receiving absolute reports\n";
            break;

      case AIPTEK_DIAGNOSTIC_TOOL_DISALLOWED:
            if (aiptek->curSetting.pointerMode ==
                AIPTEK_POINTER_ONLY_MOUSE_MODE) {
                  retMsg = "Error: receiving stylus reports\n";
            } else {
                  retMsg = "Error: receiving mouse reports\n";
            }
            break;

      default:
            return 0;
      }
      return snprintf(buf, PAGE_SIZE, retMsg);
}

static DEVICE_ATTR(diagnostic, S_IRUGO, show_tabletDiagnosticMessage, NULL);

/***********************************************************************
 * support routines for the 'stylus_upper' file. Note that this file
 * both displays current setting and allows for setting changing.
 */

static struct aiptek_map stylus_button_map[] = {
      { "upper",  AIPTEK_STYLUS_UPPER_BUTTON },
      { "lower",  AIPTEK_STYLUS_LOWER_BUTTON },
      { NULL,           AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletStylusUpper(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(stylus_button_map,
                              aiptek->curSetting.stylusButtonUpper));
}

static ssize_t
store_tabletStylusUpper(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_button = map_str_to_val(stylus_button_map, buf, count);

      if (new_button == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.stylusButtonUpper = new_button;
      return count;
}

static DEVICE_ATTR(stylus_upper,
               S_IRUGO | S_IWUGO,
               show_tabletStylusUpper, store_tabletStylusUpper);

/***********************************************************************
 * support routines for the 'stylus_lower' file. Note that this file
 * both displays current setting and allows for setting changing.
 */

static ssize_t show_tabletStylusLower(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(stylus_button_map,
                              aiptek->curSetting.stylusButtonLower));
}

static ssize_t
store_tabletStylusLower(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_button = map_str_to_val(stylus_button_map, buf, count);

      if (new_button == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.stylusButtonLower = new_button;
      return count;
}

static DEVICE_ATTR(stylus_lower,
               S_IRUGO | S_IWUGO,
               show_tabletStylusLower, store_tabletStylusLower);

/***********************************************************************
 * support routines for the 'mouse_left' file. Note that this file
 * both displays current setting and allows for setting changing.
 */

static struct aiptek_map mouse_button_map[] = {
      { "left",   AIPTEK_MOUSE_LEFT_BUTTON },
      { "middle", AIPTEK_MOUSE_MIDDLE_BUTTON },
      { "right",  AIPTEK_MOUSE_RIGHT_BUTTON },
      { NULL,           AIPTEK_INVALID_VALUE }
};

static ssize_t show_tabletMouseLeft(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(mouse_button_map,
                              aiptek->curSetting.mouseButtonLeft));
}

static ssize_t
store_tabletMouseLeft(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_button = map_str_to_val(mouse_button_map, buf, count);

      if (new_button == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.mouseButtonLeft = new_button;
      return count;
}

static DEVICE_ATTR(mouse_left,
               S_IRUGO | S_IWUGO,
               show_tabletMouseLeft, store_tabletMouseLeft);

/***********************************************************************
 * support routines for the 'mouse_middle' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletMouseMiddle(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(mouse_button_map,
                              aiptek->curSetting.mouseButtonMiddle));
}

static ssize_t
store_tabletMouseMiddle(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_button = map_str_to_val(mouse_button_map, buf, count);

      if (new_button == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.mouseButtonMiddle = new_button;
      return count;
}

static DEVICE_ATTR(mouse_middle,
               S_IRUGO | S_IWUGO,
               show_tabletMouseMiddle, store_tabletMouseMiddle);

/***********************************************************************
 * support routines for the 'mouse_right' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletMouseRight(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%s\n",
                  map_val_to_str(mouse_button_map,
                              aiptek->curSetting.mouseButtonRight));
}

static ssize_t
store_tabletMouseRight(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);
      int new_button = map_str_to_val(mouse_button_map, buf, count);

      if (new_button == AIPTEK_INVALID_VALUE)
            return -EINVAL;

      aiptek->newSetting.mouseButtonRight = new_button;
      return count;
}

static DEVICE_ATTR(mouse_right,
               S_IRUGO | S_IWUGO,
               show_tabletMouseRight, store_tabletMouseRight);

/***********************************************************************
 * support routines for the 'wheel' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletWheel(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      if (aiptek->curSetting.wheel == AIPTEK_WHEEL_DISABLE) {
            return snprintf(buf, PAGE_SIZE, "disable\n");
      } else {
            return snprintf(buf, PAGE_SIZE, "%d\n",
                        aiptek->curSetting.wheel);
      }
}

static ssize_t
store_tabletWheel(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      aiptek->newSetting.wheel = (int)simple_strtol(buf, NULL, 10);
      return count;
}

static DEVICE_ATTR(wheel,
               S_IRUGO | S_IWUGO, show_tabletWheel, store_tabletWheel);

/***********************************************************************
 * support routines for the 'execute' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletExecute(struct device *dev, struct device_attribute *attr, char *buf)
{
      /* There is nothing useful to display, so a one-line manual
       * is in order...
       */
      return snprintf(buf, PAGE_SIZE,
                  "Write anything to this file to program your tablet.\n");
}

static ssize_t
store_tabletExecute(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      /* We do not care what you write to this file. Merely the action
       * of writing to this file triggers a tablet reprogramming.
       */
      memcpy(&aiptek->curSetting, &aiptek->newSetting,
             sizeof(struct aiptek_settings));

      if (aiptek_program_tablet(aiptek) < 0)
            return -EIO;

      return count;
}

static DEVICE_ATTR(execute,
               S_IRUGO | S_IWUGO, show_tabletExecute, store_tabletExecute);

/***********************************************************************
 * support routines for the 'odm_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletODMCode(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "0x%04x\n", aiptek->features.odmCode);
}

static DEVICE_ATTR(odm_code, S_IRUGO, show_tabletODMCode, NULL);

/***********************************************************************
 * support routines for the 'model_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletModelCode(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "0x%04x\n", aiptek->features.modelCode);
}

static DEVICE_ATTR(model_code, S_IRUGO, show_tabletModelCode, NULL);

/***********************************************************************
 * support routines for the 'firmware_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_firmwareCode(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct aiptek *aiptek = dev_get_drvdata(dev);

      return snprintf(buf, PAGE_SIZE, "%04x\n",
                  aiptek->features.firmwareCode);
}

static DEVICE_ATTR(firmware_code, S_IRUGO, show_firmwareCode, NULL);

static struct attribute *aiptek_attributes[] = {
      &dev_attr_size.attr,
      &dev_attr_pointer_mode.attr,
      &dev_attr_coordinate_mode.attr,
      &dev_attr_tool_mode.attr,
      &dev_attr_xtilt.attr,
      &dev_attr_ytilt.attr,
      &dev_attr_jitter.attr,
      &dev_attr_delay.attr,
      &dev_attr_event_count.attr,
      &dev_attr_diagnostic.attr,
      &dev_attr_odm_code.attr,
      &dev_attr_model_code.attr,
      &dev_attr_firmware_code.attr,
      &dev_attr_stylus_lower.attr,
      &dev_attr_stylus_upper.attr,
      &dev_attr_mouse_left.attr,
      &dev_attr_mouse_middle.attr,
      &dev_attr_mouse_right.attr,
      &dev_attr_wheel.attr,
      &dev_attr_execute.attr,
      NULL
};

static struct attribute_group aiptek_attribute_group = {
      .attrs      = aiptek_attributes,
};

/***********************************************************************
 * This routine is called when a tablet has been identified. It basically
 * sets up the tablet and the driver's internal structures.
 */
static int
aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
      struct usb_device *usbdev = interface_to_usbdev(intf);
      struct usb_endpoint_descriptor *endpoint;
      struct aiptek *aiptek;
      struct input_dev *inputdev;
      int i;
      int speeds[] = { 0,
            AIPTEK_PROGRAMMABLE_DELAY_50,
            AIPTEK_PROGRAMMABLE_DELAY_400,
            AIPTEK_PROGRAMMABLE_DELAY_25,
            AIPTEK_PROGRAMMABLE_DELAY_100,
            AIPTEK_PROGRAMMABLE_DELAY_200,
            AIPTEK_PROGRAMMABLE_DELAY_300
      };
      int err = -ENOMEM;

      /* programmableDelay is where the command-line specified
       * delay is kept. We make it the first element of speeds[],
       * so therefore, your override speed is tried first, then the
       * remainder. Note that the default value of 400ms will be tried
       * if you do not specify any command line parameter.
       */
      speeds[0] = programmableDelay;

      aiptek = kzalloc(sizeof(struct aiptek), GFP_KERNEL);
      inputdev = input_allocate_device();
      if (!aiptek || !inputdev) {
            warn("aiptek: cannot allocate memory or input device");
            goto fail1;
        }

      aiptek->data = usb_buffer_alloc(usbdev, AIPTEK_PACKET_LENGTH,
                              GFP_ATOMIC, &aiptek->data_dma);
        if (!aiptek->data) {
            warn("aiptek: cannot allocate usb buffer");
            goto fail1;
      }

      aiptek->urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!aiptek->urb) {
              warn("aiptek: cannot allocate urb");
            goto fail2;
      }

      aiptek->inputdev = inputdev;
      aiptek->usbdev = usbdev;
      aiptek->ifnum = intf->altsetting[0].desc.bInterfaceNumber;
      aiptek->inDelay = 0;
      aiptek->endDelay = 0;
      aiptek->previousJitterable = 0;
      aiptek->lastMacro = -1;

      /* Set up the curSettings struct. Said struct contains the current
       * programmable parameters. The newSetting struct contains changes
       * the user makes to the settings via the sysfs interface. Those
       * changes are not "committed" to curSettings until the user
       * writes to the sysfs/.../execute file.
       */
      aiptek->curSetting.pointerMode = AIPTEK_POINTER_EITHER_MODE;
      aiptek->curSetting.coordinateMode = AIPTEK_COORDINATE_ABSOLUTE_MODE;
      aiptek->curSetting.toolMode = AIPTEK_TOOL_BUTTON_PEN_MODE;
      aiptek->curSetting.xTilt = AIPTEK_TILT_DISABLE;
      aiptek->curSetting.yTilt = AIPTEK_TILT_DISABLE;
      aiptek->curSetting.mouseButtonLeft = AIPTEK_MOUSE_LEFT_BUTTON;
      aiptek->curSetting.mouseButtonMiddle = AIPTEK_MOUSE_MIDDLE_BUTTON;
      aiptek->curSetting.mouseButtonRight = AIPTEK_MOUSE_RIGHT_BUTTON;
      aiptek->curSetting.stylusButtonUpper = AIPTEK_STYLUS_UPPER_BUTTON;
      aiptek->curSetting.stylusButtonLower = AIPTEK_STYLUS_LOWER_BUTTON;
      aiptek->curSetting.jitterDelay = jitterDelay;
      aiptek->curSetting.programmableDelay = programmableDelay;

      /* Both structs should have equivalent settings
       */
      aiptek->newSetting = aiptek->curSetting;

      /* Determine the usb devices' physical path.
       * Asketh not why we always pretend we're using "../input0",
       * but I suspect this will have to be refactored one
       * day if a single USB device can be a keyboard & a mouse
       * & a tablet, and the inputX number actually will tell
       * us something...
       */
      usb_make_path(usbdev, aiptek->features.usbPath,
                  sizeof(aiptek->features.usbPath));
      strlcat(aiptek->features.usbPath, "/input0",
            sizeof(aiptek->features.usbPath));

      /* Set up client data, pointers to open and close routines
       * for the input device.
       */
      inputdev->name = "Aiptek";
      inputdev->phys = aiptek->features.usbPath;
      usb_to_input_id(usbdev, &inputdev->id);
      inputdev->dev.parent = &intf->dev;

      input_set_drvdata(inputdev, aiptek);

      inputdev->open = aiptek_open;
      inputdev->close = aiptek_close;

      /* Now program the capacities of the tablet, in terms of being
       * an input device.
       */
      for (i = 0; i < ARRAY_SIZE(eventTypes); ++i)
              __set_bit(eventTypes[i], inputdev->evbit);

      for (i = 0; i < ARRAY_SIZE(absEvents); ++i)
              __set_bit(absEvents[i], inputdev->absbit);

      for (i = 0; i < ARRAY_SIZE(relEvents); ++i)
              __set_bit(relEvents[i], inputdev->relbit);

      __set_bit(MSC_SERIAL, inputdev->mscbit);

      /* Set up key and button codes */
      for (i = 0; i < ARRAY_SIZE(buttonEvents); ++i)
            __set_bit(buttonEvents[i], inputdev->keybit);

      for (i = 0; i < ARRAY_SIZE(macroKeyEvents); ++i)
            __set_bit(macroKeyEvents[i], inputdev->keybit);

      /*
       * Program the input device coordinate capacities. We do not yet
       * know what maximum X, Y, and Z values are, so we're putting fake
       * values in. Later, we'll ask the tablet to put in the correct
       * values.
       */
      input_set_abs_params(inputdev, ABS_X, 0, 2999, 0, 0);
      input_set_abs_params(inputdev, ABS_Y, 0, 2249, 0, 0);
      input_set_abs_params(inputdev, ABS_PRESSURE, 0, 511, 0, 0);
      input_set_abs_params(inputdev, ABS_TILT_X, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
      input_set_abs_params(inputdev, ABS_TILT_Y, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
      input_set_abs_params(inputdev, ABS_WHEEL, AIPTEK_WHEEL_MIN, AIPTEK_WHEEL_MAX - 1, 0, 0);

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

      /* Go set up our URB, which is called when the tablet receives
       * input.
       */
      usb_fill_int_urb(aiptek->urb,
                   aiptek->usbdev,
                   usb_rcvintpipe(aiptek->usbdev,
                              endpoint->bEndpointAddress),
                   aiptek->data, 8, aiptek_irq, aiptek,
                   endpoint->bInterval);

      aiptek->urb->transfer_dma = aiptek->data_dma;
      aiptek->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

      /* Program the tablet. This sets the tablet up in the mode
       * specified in newSetting, and also queries the tablet's
       * physical capacities.
       *
       * Sanity check: if a tablet doesn't like the slow programmatic
       * delay, we often get sizes of 0x0. Let's use that as an indicator
       * to try faster delays, up to 25 ms. If that logic fails, well, you'll
       * have to explain to us how your tablet thinks it's 0x0, and yet that's
       * not an error :-)
       */

      for (i = 0; i < ARRAY_SIZE(speeds); ++i) {
            aiptek->curSetting.programmableDelay = speeds[i];
            (void)aiptek_program_tablet(aiptek);
            if (aiptek->inputdev->absmax[ABS_X] > 0) {
                  info("input: Aiptek using %d ms programming speed\n",
                       aiptek->curSetting.programmableDelay);
                  break;
            }
      }

      /* Murphy says that some day someone will have a tablet that fails the
         above test. That's you, Frederic Rodrigo */
      if (i == ARRAY_SIZE(speeds)) {
            info("input: Aiptek tried all speeds, no sane response");
            goto fail2;
      }

      /* Associate this driver's struct with the usb interface.
       */
      usb_set_intfdata(intf, aiptek);

      /* Set up the sysfs files
       */
      err = sysfs_create_group(&intf->dev.kobj, &aiptek_attribute_group);
      if (err) {
            warn("aiptek: cannot create sysfs group err: %d", err);
            goto fail3;
        }

      /* Register the tablet as an Input Device
       */
      err = input_register_device(aiptek->inputdev);
      if (err) {
            warn("aiptek: input_register_device returned err: %d", err);
            goto fail4;
        }
      return 0;

 fail4:     sysfs_remove_group(&intf->dev.kobj, &aiptek_attribute_group);
 fail3: usb_free_urb(aiptek->urb);
 fail2:     usb_buffer_free(usbdev, AIPTEK_PACKET_LENGTH, aiptek->data,
                  aiptek->data_dma);
 fail1: usb_set_intfdata(intf, NULL);
      input_free_device(inputdev);
      kfree(aiptek);
      return err;
}

/***********************************************************************
 * Deal with tablet disconnecting from the system.
 */
static void aiptek_disconnect(struct usb_interface *intf)
{
      struct aiptek *aiptek = usb_get_intfdata(intf);

      /* Disassociate driver's struct with usb interface
       */
      usb_set_intfdata(intf, NULL);
      if (aiptek != NULL) {
            /* Free & unhook everything from the system.
             */
            usb_kill_urb(aiptek->urb);
            input_unregister_device(aiptek->inputdev);
            sysfs_remove_group(&intf->dev.kobj, &aiptek_attribute_group);
            usb_free_urb(aiptek->urb);
            usb_buffer_free(interface_to_usbdev(intf),
                        AIPTEK_PACKET_LENGTH,
                        aiptek->data, aiptek->data_dma);
            kfree(aiptek);
      }
}

static struct usb_driver aiptek_driver = {
      .name = "aiptek",
      .probe = aiptek_probe,
      .disconnect = aiptek_disconnect,
      .id_table = aiptek_ids,
};

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

static void __exit aiptek_exit(void)
{
      usb_deregister(&aiptek_driver);
}

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

module_param(programmableDelay, int, 0);
MODULE_PARM_DESC(programmableDelay, "delay used during tablet programming");
module_param(jitterDelay, int, 0);
MODULE_PARM_DESC(jitterDelay, "stylus/mouse settlement delay");

module_init(aiptek_init);
module_exit(aiptek_exit);

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