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usbtouchscreen.c

/******************************************************************************
 * usbtouchscreen.c
 * Driver for USB Touchscreens, supporting those devices:
 *  - eGalax Touchkit
 *    includes eTurboTouch CT-410/510/700
 *  - 3M/Microtouch  EX II series
 *  - ITM
 *  - PanJit TouchSet
 *  - eTurboTouch
 *  - Gunze AHL61
 *  - DMC TSC-10/25
 *  - IRTOUCHSYSTEMS/UNITOP
 *  - IdealTEK URTC1000
 *  - General Touch
 *  - GoTop Super_Q2/GogoPen/PenPower tablets
 *
 * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Driver is based on touchkitusb.c
 * - ITM parts are from itmtouch.c
 * - 3M parts are from mtouchusb.c
 * - PanJit parts are from an unmerged driver by Lanslott Gish
 * - DMC TSC 10/25 are from Holger Schurig, with ideas from an unmerged
 *   driver from Marius Vollmer
 *
 *****************************************************************************/

//#define DEBUG

#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>


#define DRIVER_VERSION        "v0.6"
#define DRIVER_AUTHOR         "Daniel Ritz <daniel.ritz@gmx.ch>"
#define DRIVER_DESC           "USB Touchscreen Driver"

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

/* device specifc data/functions */
struct usbtouch_usb;
struct usbtouch_device_info {
      int min_xc, max_xc;
      int min_yc, max_yc;
      int min_press, max_press;
      int rept_size;

      void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);

      /*
       * used to get the packet len. possible return values:
       * > 0: packet len
       * = 0: skip one byte
       * < 0: -return value more bytes needed
       */
      int  (*get_pkt_len) (unsigned char *pkt, int len);

      int  (*read_data)   (struct usbtouch_usb *usbtouch, unsigned char *pkt);
      int  (*init)        (struct usbtouch_usb *usbtouch);
};

/* a usbtouch device */
struct usbtouch_usb {
      unsigned char *data;
      dma_addr_t data_dma;
      unsigned char *buffer;
      int buf_len;
      struct urb *irq;
      struct usb_device *udev;
      struct input_dev *input;
      struct usbtouch_device_info *type;
      char name[128];
      char phys[64];

      int x, y;
      int touch, press;
};


/* device types */
enum {
      DEVTPYE_DUMMY = -1,
      DEVTYPE_EGALAX,
      DEVTYPE_PANJIT,
      DEVTYPE_3M,
      DEVTYPE_ITM,
      DEVTYPE_ETURBO,
      DEVTYPE_GUNZE,
      DEVTYPE_DMC_TSC10,
      DEVTYPE_IRTOUCH,
      DEVTYPE_IDEALTEK,
      DEVTYPE_GENERAL_TOUCH,
      DEVTYPE_GOTOP,
};

static struct usb_device_id usbtouch_devices[] = {
#ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
      {USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
      {USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
      {USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
      {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
      {USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
      {USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
      {USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
      {USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
      {USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
      {USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
      {USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_3M
      {USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ITM
      {USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
      {USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
      {USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
      {USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
      {USB_DEVICE(0x595a, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
      {USB_DEVICE(0x6615, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
      {USB_DEVICE(0x1391, 0x1000), .driver_info = DEVTYPE_IDEALTEK},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
      {USB_DEVICE(0x0dfc, 0x0001), .driver_info = DEVTYPE_GENERAL_TOUCH},
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
      {USB_DEVICE(0x08f2, 0x007f), .driver_info = DEVTYPE_GOTOP},
      {USB_DEVICE(0x08f2, 0x00ce), .driver_info = DEVTYPE_GOTOP},
      {USB_DEVICE(0x08f2, 0x00f4), .driver_info = DEVTYPE_GOTOP},
#endif

      {}
};


/*****************************************************************************
 * eGalax part
 */

#ifdef CONFIG_TOUCHSCREEN_USB_EGALAX

#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif

#define EGALAX_PKT_TYPE_MASK        0xFE
#define EGALAX_PKT_TYPE_REPT        0x80
#define EGALAX_PKT_TYPE_DIAG        0x0A

static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
            return 0;

      dev->x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
      dev->y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
      dev->touch = pkt[0] & 0x01;

      return 1;
}

static int egalax_get_pkt_len(unsigned char *buf, int len)
{
      switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
      case EGALAX_PKT_TYPE_REPT:
            return 5;

      case EGALAX_PKT_TYPE_DIAG:
            if (len < 2)
                  return -1;

            return buf[1] + 2;
      }

      return 0;
}
#endif


/*****************************************************************************
 * PanJit Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
      dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
      dev->touch = pkt[0] & 0x01;

      return 1;
}
#endif


/*****************************************************************************
 * 3M/Microtouch Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_3M

#define MTOUCHUSB_ASYNC_REPORT          1
#define MTOUCHUSB_RESET                 7
#define MTOUCHUSB_REQ_CTRLLR_ID         10

static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      dev->x = (pkt[8] << 8) | pkt[7];
      dev->y = (pkt[10] << 8) | pkt[9];
      dev->touch = (pkt[2] & 0x40) ? 1 : 0;

      return 1;
}

static int mtouch_init(struct usbtouch_usb *usbtouch)
{
      int ret, i;

      ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
                            MTOUCHUSB_RESET,
                            USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                            1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
      dbg("%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d",
          __FUNCTION__, ret);
      if (ret < 0)
            return ret;
      msleep(150);

      for (i = 0; i < 3; i++) {
            ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
                              MTOUCHUSB_ASYNC_REPORT,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
            dbg("%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d",
                __FUNCTION__, ret);
            if (ret >= 0)
                  break;
            if (ret != -EPIPE)
                  return ret;
      }

      return 0;
}
#endif


/*****************************************************************************
 * ITM Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_ITM
static int itm_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      int touch;
      /*
       * ITM devices report invalid x/y data if not touched.
       * if the screen was touched before but is not touched any more
       * report touch as 0 with the last valid x/y data once. then stop
       * reporting data until touched again.
       */
      dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);

      touch = ~pkt[7] & 0x20;
      if (!touch) {
            if (dev->touch) {
                  dev->touch = 0;
                  return 1;
            }

            return 0;
      }

      dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
      dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
      dev->touch = touch;

      return 1;
}
#endif


/*****************************************************************************
 * eTurboTouch part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif
static int eturbo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      unsigned int shift;

      /* packets should start with sync */
      if (!(pkt[0] & 0x80))
            return 0;

      shift = (6 - (pkt[0] & 0x03));
      dev->x = ((pkt[3] << 7) | pkt[4]) >> shift;
      dev->y = ((pkt[1] << 7) | pkt[2]) >> shift;
      dev->touch = (pkt[0] & 0x10) ? 1 : 0;

      return 1;
}

static int eturbo_get_pkt_len(unsigned char *buf, int len)
{
      if (buf[0] & 0x80)
            return 5;
      if (buf[0] == 0x01)
            return 3;
      return 0;
}
#endif


/*****************************************************************************
 * Gunze part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
static int gunze_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
            return 0;

      dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
      dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
      dev->touch = pkt[0] & 0x20;

      return 1;
}
#endif

/*****************************************************************************
 * DMC TSC-10/25 Part
 *
 * Documentation about the controller and it's protocol can be found at
 *   http://www.dmccoltd.com/files/controler/tsc10usb_pi_e.pdf
 *   http://www.dmccoltd.com/files/controler/tsc25_usb_e.pdf
 */
#ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10

/* supported data rates. currently using 130 */
#define TSC10_RATE_POINT      0x50
#define TSC10_RATE_30         0x40
#define TSC10_RATE_50         0x41
#define TSC10_RATE_80         0x42
#define TSC10_RATE_100        0x43
#define TSC10_RATE_130        0x44
#define TSC10_RATE_150        0x45

/* commands */
#define TSC10_CMD_RESET       0x55
#define TSC10_CMD_RATE        0x05
#define TSC10_CMD_DATA1       0x01

static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
{
      struct usb_device *dev = usbtouch->udev;
      int ret;
      unsigned char buf[2];

      /* reset */
      buf[0] = buf[1] = 0xFF;
      ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
                            TSC10_CMD_RESET,
                            USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                            0, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
      if (ret < 0)
            return ret;
      if (buf[0] != 0x06 || buf[1] != 0x00)
            return -ENODEV;

      /* set coordinate output rate */
      buf[0] = buf[1] = 0xFF;
      ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
                            TSC10_CMD_RATE,
                            USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                            TSC10_RATE_150, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
      if (ret < 0)
            return ret;
      if ((buf[0] != 0x06 || buf[1] != 0x00) &&
          (buf[0] != 0x15 || buf[1] != 0x01))
            return -ENODEV;

      /* start sending data */
      ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
                            TSC10_CMD_DATA1,
                            USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                            0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
      if (ret < 0)
            return ret;

      return 0;
}


static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      dev->x = ((pkt[2] & 0x03) << 8) | pkt[1];
      dev->y = ((pkt[4] & 0x03) << 8) | pkt[3];
      dev->touch = pkt[0] & 0x01;

      return 1;
}
#endif


/*****************************************************************************
 * IRTOUCH Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
static int irtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      dev->x = (pkt[3] << 8) | pkt[2];
      dev->y = (pkt[5] << 8) | pkt[4];
      dev->touch = (pkt[1] & 0x03) ? 1 : 0;

      return 1;
}
#endif


/*****************************************************************************
 * IdealTEK URTC1000 Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif
static int idealtek_get_pkt_len(unsigned char *buf, int len)
{
      if (buf[0] & 0x80)
            return 5;
      if (buf[0] == 0x01)
            return len;
      return 0;
}

static int idealtek_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      switch (pkt[0] & 0x98) {
      case 0x88:
            /* touch data in IdealTEK mode */
            dev->x = (pkt[1] << 5) | (pkt[2] >> 2);
            dev->y = (pkt[3] << 5) | (pkt[4] >> 2);
            dev->touch = (pkt[0] & 0x40) ? 1 : 0;
            return 1;

      case 0x98:
            /* touch data in MT emulation mode */
            dev->x = (pkt[2] << 5) | (pkt[1] >> 2);
            dev->y = (pkt[4] << 5) | (pkt[3] >> 2);
            dev->touch = (pkt[0] & 0x40) ? 1 : 0;
            return 1;

      default:
            return 0;
      }
}
#endif

/*****************************************************************************
 * General Touch Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
static int general_touch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1] ;
      dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3] ;
      dev->press = pkt[5] & 0xff;
      dev->touch = pkt[0] & 0x01;

      return 1;
}
#endif

/*****************************************************************************
 * GoTop Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
static int gotop_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
      dev->x = ((pkt[1] & 0x38) << 4) | pkt[2];
      dev->y = ((pkt[1] & 0x07) << 7) | pkt[3];
      dev->touch = pkt[0] & 0x01;
      return 1;
}
#endif


/*****************************************************************************
 * the different device descriptors
 */
#ifdef MULTI_PACKET
static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
                           unsigned char *pkt, int len);
#endif

static struct usbtouch_device_info usbtouch_dev_info[] = {
#ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
      [DEVTYPE_EGALAX] = {
            .min_xc           = 0x0,
            .max_xc           = 0x07ff,
            .min_yc           = 0x0,
            .max_yc           = 0x07ff,
            .rept_size  = 16,
            .process_pkt      = usbtouch_process_multi,
            .get_pkt_len      = egalax_get_pkt_len,
            .read_data  = egalax_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
      [DEVTYPE_PANJIT] = {
            .min_xc           = 0x0,
            .max_xc           = 0x0fff,
            .min_yc           = 0x0,
            .max_yc           = 0x0fff,
            .rept_size  = 8,
            .read_data  = panjit_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_3M
      [DEVTYPE_3M] = {
            .min_xc           = 0x0,
            .max_xc           = 0x4000,
            .min_yc           = 0x0,
            .max_yc           = 0x4000,
            .rept_size  = 11,
            .read_data  = mtouch_read_data,
            .init       = mtouch_init,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ITM
      [DEVTYPE_ITM] = {
            .min_xc           = 0x0,
            .max_xc           = 0x0fff,
            .min_yc           = 0x0,
            .max_yc           = 0x0fff,
            .max_press  = 0xff,
            .rept_size  = 8,
            .read_data  = itm_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
      [DEVTYPE_ETURBO] = {
            .min_xc           = 0x0,
            .max_xc           = 0x07ff,
            .min_yc           = 0x0,
            .max_yc           = 0x07ff,
            .rept_size  = 8,
            .process_pkt      = usbtouch_process_multi,
            .get_pkt_len      = eturbo_get_pkt_len,
            .read_data  = eturbo_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
      [DEVTYPE_GUNZE] = {
            .min_xc           = 0x0,
            .max_xc           = 0x0fff,
            .min_yc           = 0x0,
            .max_yc           = 0x0fff,
            .rept_size  = 4,
            .read_data  = gunze_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
      [DEVTYPE_DMC_TSC10] = {
            .min_xc           = 0x0,
            .max_xc           = 0x03ff,
            .min_yc           = 0x0,
            .max_yc           = 0x03ff,
            .rept_size  = 5,
            .init       = dmc_tsc10_init,
            .read_data  = dmc_tsc10_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
      [DEVTYPE_IRTOUCH] = {
            .min_xc           = 0x0,
            .max_xc           = 0x0fff,
            .min_yc           = 0x0,
            .max_yc           = 0x0fff,
            .rept_size  = 8,
            .read_data  = irtouch_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
      [DEVTYPE_IDEALTEK] = {
            .min_xc           = 0x0,
            .max_xc           = 0x0fff,
            .min_yc           = 0x0,
            .max_yc           = 0x0fff,
            .rept_size  = 8,
            .process_pkt      = usbtouch_process_multi,
            .get_pkt_len      = idealtek_get_pkt_len,
            .read_data  = idealtek_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
      [DEVTYPE_GENERAL_TOUCH] = {
            .min_xc           = 0x0,
            .max_xc           = 0x0500,
            .min_yc           = 0x0,
            .max_yc           = 0x0500,
            .rept_size  = 7,
            .read_data  = general_touch_read_data,
      },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
      [DEVTYPE_GOTOP] = {
            .min_xc           = 0x0,
            .max_xc           = 0x03ff,
            .min_yc           = 0x0,
            .max_yc           = 0x03ff,
            .rept_size  = 4,
            .read_data  = gotop_read_data,
      },
#endif
};


/*****************************************************************************
 * Generic Part
 */
static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
                                 unsigned char *pkt, int len)
{
      struct usbtouch_device_info *type = usbtouch->type;

      if (!type->read_data(usbtouch, pkt))
                  return;

      input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);

      if (swap_xy) {
            input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
            input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
      } else {
            input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
            input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
      }
      if (type->max_press)
            input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
      input_sync(usbtouch->input);
}


#ifdef MULTI_PACKET
static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
                                   unsigned char *pkt, int len)
{
      unsigned char *buffer;
      int pkt_len, pos, buf_len, tmp;

      /* process buffer */
      if (unlikely(usbtouch->buf_len)) {
            /* try to get size */
            pkt_len = usbtouch->type->get_pkt_len(
                        usbtouch->buffer, usbtouch->buf_len);

            /* drop? */
            if (unlikely(!pkt_len))
                  goto out_flush_buf;

            /* need to append -pkt_len bytes before able to get size */
            if (unlikely(pkt_len < 0)) {
                  int append = -pkt_len;
                  if (unlikely(append > len))
                         append = len;
                  if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
                        goto out_flush_buf;
                  memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
                  usbtouch->buf_len += append;

                  pkt_len = usbtouch->type->get_pkt_len(
                              usbtouch->buffer, usbtouch->buf_len);
                  if (pkt_len < 0)
                        return;
            }

            /* append */
            tmp = pkt_len - usbtouch->buf_len;
            if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
                  goto out_flush_buf;
            memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
            usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);

            buffer = pkt + tmp;
            buf_len = len - tmp;
      } else {
            buffer = pkt;
            buf_len = len;
      }

      /* loop over the received packet, process */
      pos = 0;
      while (pos < buf_len) {
            /* get packet len */
            pkt_len = usbtouch->type->get_pkt_len(buffer + pos,
                                          buf_len - pos);

            /* unknown packet: skip one byte */
            if (unlikely(!pkt_len)) {
                  pos++;
                  continue;
            }

            /* full packet: process */
            if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
                  usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
            } else {
                  /* incomplete packet: save in buffer */
                  memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
                  usbtouch->buf_len = buf_len - pos;
                  return;
            }
            pos += pkt_len;
      }

out_flush_buf:
      usbtouch->buf_len = 0;
      return;
}
#endif


static void usbtouch_irq(struct urb *urb)
{
      struct usbtouch_usb *usbtouch = urb->context;
      int retval;

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

      usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);

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

static int usbtouch_open(struct input_dev *input)
{
      struct usbtouch_usb *usbtouch = input_get_drvdata(input);

      usbtouch->irq->dev = usbtouch->udev;

      if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
            return -EIO;

      return 0;
}

static void usbtouch_close(struct input_dev *input)
{
      struct usbtouch_usb *usbtouch = input_get_drvdata(input);

      usb_kill_urb(usbtouch->irq);
}


static void usbtouch_free_buffers(struct usb_device *udev,
                          struct usbtouch_usb *usbtouch)
{
      usb_buffer_free(udev, usbtouch->type->rept_size,
                      usbtouch->data, usbtouch->data_dma);
      kfree(usbtouch->buffer);
}


static int usbtouch_probe(struct usb_interface *intf,
                    const struct usb_device_id *id)
{
      struct usbtouch_usb *usbtouch;
      struct input_dev *input_dev;
      struct usb_host_interface *interface;
      struct usb_endpoint_descriptor *endpoint;
      struct usb_device *udev = interface_to_usbdev(intf);
      struct usbtouch_device_info *type;
      int err = -ENOMEM;

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

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

      type = &usbtouch_dev_info[id->driver_info];
      usbtouch->type = type;
      if (!type->process_pkt)
            type->process_pkt = usbtouch_process_pkt;

      usbtouch->data = usb_buffer_alloc(udev, type->rept_size,
                                        GFP_KERNEL, &usbtouch->data_dma);
      if (!usbtouch->data)
            goto out_free;

      if (type->get_pkt_len) {
            usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
            if (!usbtouch->buffer)
                  goto out_free_buffers;
      }

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

      usbtouch->udev = udev;
      usbtouch->input = input_dev;

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

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

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

      usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
      strlcat(usbtouch->phys, "/input0", sizeof(usbtouch->phys));

      input_dev->name = usbtouch->name;
      input_dev->phys = usbtouch->phys;
      usb_to_input_id(udev, &input_dev->id);
      input_dev->dev.parent = &intf->dev;

      input_set_drvdata(input_dev, usbtouch);

      input_dev->open = usbtouch_open;
      input_dev->close = usbtouch_close;

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
      input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
      input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
      input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
      if (type->max_press)
            input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
                                 type->max_press, 0, 0);

      usb_fill_int_urb(usbtouch->irq, usbtouch->udev,
                   usb_rcvintpipe(usbtouch->udev, endpoint->bEndpointAddress),
                   usbtouch->data, type->rept_size,
                   usbtouch_irq, usbtouch, endpoint->bInterval);

      usbtouch->irq->dev = usbtouch->udev;
      usbtouch->irq->transfer_dma = usbtouch->data_dma;
      usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

      /* device specific init */
      if (type->init) {
            err = type->init(usbtouch);
            if (err) {
                  dbg("%s - type->init() failed, err: %d", __FUNCTION__, err);
                  goto out_free_buffers;
            }
      }

      err = input_register_device(usbtouch->input);
      if (err) {
            dbg("%s - input_register_device failed, err: %d", __FUNCTION__, err);
            goto out_free_buffers;
      }

      usb_set_intfdata(intf, usbtouch);

      return 0;

out_free_buffers:
      usbtouch_free_buffers(udev, usbtouch);
out_free:
      input_free_device(input_dev);
      kfree(usbtouch);
      return err;
}

static void usbtouch_disconnect(struct usb_interface *intf)
{
      struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);

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

      if (!usbtouch)
            return;

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

MODULE_DEVICE_TABLE(usb, usbtouch_devices);

static struct usb_driver usbtouch_driver = {
      .name       = "usbtouchscreen",
      .probe            = usbtouch_probe,
      .disconnect = usbtouch_disconnect,
      .id_table   = usbtouch_devices,
};

static int __init usbtouch_init(void)
{
      return usb_register(&usbtouch_driver);
}

static void __exit usbtouch_cleanup(void)
{
      usb_deregister(&usbtouch_driver);
}

module_init(usbtouch_init);
module_exit(usbtouch_cleanup);

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

MODULE_ALIAS("touchkitusb");
MODULE_ALIAS("itmtouch");
MODULE_ALIAS("mtouchusb");

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