drivers/input/touchscreen/usbtouchscreen.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /******************************************************************************
   3  * usbtouchscreen.c
   4  * Driver for USB Touchscreens, supporting those devices:
   5  *  - eGalax Touchkit
   6  *    includes eTurboTouch CT-410/510/700
   7  *  - 3M/Microtouch  EX II series
   8  *  - ITM
   9  *  - PanJit TouchSet
  10  *  - eTurboTouch
  11  *  - Gunze AHL61
  12  *  - DMC TSC-10/25
  13  *  - IRTOUCHSYSTEMS/UNITOP
  14  *  - IdealTEK URTC1000
  15  *  - General Touch
  16  *  - GoTop Super_Q2/GogoPen/PenPower tablets
  17  *  - JASTEC USB touch controller/DigiTech DTR-02U
  18  *  - Zytronic capacitive touchscreen
  19  *  - NEXIO/iNexio
  20  *  - Elo TouchSystems 2700 IntelliTouch
  21  *  - EasyTouch USB Dual/Multi touch controller from Data Modul
  22  *
  23  * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
  24  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
  25  *
  26  * Driver is based on touchkitusb.c
  27  * - ITM parts are from itmtouch.c
  28  * - 3M parts are from mtouchusb.c
  29  * - PanJit parts are from an unmerged driver by Lanslott Gish
  30  * - DMC TSC 10/25 are from Holger Schurig, with ideas from an unmerged
  31  *   driver from Marius Vollmer
  32  *
  33  *****************************************************************************/
  34
  35 //#define DEBUG
  36
  37 #include <linux/kernel.h>
  38 #include <linux/slab.h>
  39 #include <linux/input.h>
  40 #include <linux/module.h>
  41 #include <linux/usb.h>
  42 #include <linux/usb/input.h>
  43 #include <linux/hid.h>
  44 #include <linux/mutex.h>
  45
  46 static bool swap_xy;
  47 module_param(swap_xy, bool, 0644);
  48 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
  49
  50 static bool hwcalib_xy;
  51 module_param(hwcalib_xy, bool, 0644);
  52 MODULE_PARM_DESC(hwcalib_xy, "If set hw-calibrated X/Y are used if available");
  53
  54 /* device specifc data/functions */
  55 struct usbtouch_usb;
  56 struct usbtouch_device_info {
  57         int min_xc, max_xc;
  58         int min_yc, max_yc;
  59         int min_press, max_press;
  60         int rept_size;
  61
  62         /*
  63          * Always service the USB devices irq not just when the input device is
  64          * open. This is useful when devices have a watchdog which prevents us
  65          * from periodically polling the device. Leave this unset unless your
  66          * touchscreen device requires it, as it does consume more of the USB
  67          * bandwidth.
  68          */
  69         bool irq_always;
  70
  71         void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
  72
  73         /*
  74          * used to get the packet len. possible return values:
  75          * > 0: packet len
  76          * = 0: skip one byte
  77          * < 0: -return value more bytes needed
  78          */
  79         int  (*get_pkt_len) (unsigned char *pkt, int len);
  80
  81         int  (*read_data)   (struct usbtouch_usb *usbtouch, unsigned char *pkt);
  82         int  (*alloc)       (struct usbtouch_usb *usbtouch);
  83         int  (*init)        (struct usbtouch_usb *usbtouch);
  84         void (*exit)        (struct usbtouch_usb *usbtouch);
  85 };
  86
  87 /* a usbtouch device */
  88 struct usbtouch_usb {
  89         unsigned char *data;
  90         dma_addr_t data_dma;
  91         int data_size;
  92         unsigned char *buffer;
  93         int buf_len;
  94         struct urb *irq;
  95         struct usb_interface *interface;
  96         struct input_dev *input;
  97         struct usbtouch_device_info *type;
  98         struct mutex pm_mutex;  /* serialize access to open/suspend */
  99         bool is_open;
 100         char name[128];
 101         char phys[64];
 102         void *priv;
 103
 104         int x, y;
 105         int touch, press;
 106 };
 107
 108
 109 /* device types */
 110 enum {
 111         DEVTYPE_IGNORE = -1,
 112         DEVTYPE_EGALAX,
 113         DEVTYPE_PANJIT,
 114         DEVTYPE_3M,
 115         DEVTYPE_ITM,
 116         DEVTYPE_ETURBO,
 117         DEVTYPE_GUNZE,
 118         DEVTYPE_DMC_TSC10,
 119         DEVTYPE_IRTOUCH,
 120         DEVTYPE_IRTOUCH_HIRES,
 121         DEVTYPE_IDEALTEK,
 122         DEVTYPE_GENERAL_TOUCH,
 123         DEVTYPE_GOTOP,
 124         DEVTYPE_JASTEC,
 125         DEVTYPE_E2I,
 126         DEVTYPE_ZYTRONIC,
 127         DEVTYPE_TC45USB,
 128         DEVTYPE_NEXIO,
 129         DEVTYPE_ELO,
 130         DEVTYPE_ETOUCH,
 131 };
 132
 133 #define USB_DEVICE_HID_CLASS(vend, prod) \
 134         .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS \
 135                 | USB_DEVICE_ID_MATCH_DEVICE, \
 136         .idVendor = (vend), \
 137         .idProduct = (prod), \
 138         .bInterfaceClass = USB_INTERFACE_CLASS_HID
 139
 140 static const struct usb_device_id usbtouch_devices[] = {
 141 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
 142         /* ignore the HID capable devices, handled by usbhid */
 143         {USB_DEVICE_HID_CLASS(0x0eef, 0x0001), .driver_info = DEVTYPE_IGNORE},
 144         {USB_DEVICE_HID_CLASS(0x0eef, 0x0002), .driver_info = DEVTYPE_IGNORE},
 145
 146         /* normal device IDs */
 147         {USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
 148         {USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
 149         {USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
 150         {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
 151         {USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
 152         {USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
 153         {USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
 154 #endif
 155
 156 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
 157         {USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
 158         {USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
 159         {USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
 160         {USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
 161 #endif
 162
 163 #ifdef CONFIG_TOUCHSCREEN_USB_3M
 164         {USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
 165 #endif
 166
 167 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
 168         {USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
 169         {USB_DEVICE(0x16e3, 0xf9e9), .driver_info = DEVTYPE_ITM},
 170 #endif
 171
 172 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
 173         {USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
 174 #endif
 175
 176 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
 177         {USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
 178 #endif
 179
 180 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
 181         {USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
 182 #endif
 183
 184 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
 185         {USB_DEVICE(0x255e, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
 186         {USB_DEVICE(0x595a, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
 187         {USB_DEVICE(0x6615, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
 188         {USB_DEVICE(0x6615, 0x0012), .driver_info = DEVTYPE_IRTOUCH_HIRES},
 189 #endif
 190
 191 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
 192         {USB_DEVICE(0x1391, 0x1000), .driver_info = DEVTYPE_IDEALTEK},
 193 #endif
 194
 195 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
 196         {USB_DEVICE(0x0dfc, 0x0001), .driver_info = DEVTYPE_GENERAL_TOUCH},
 197 #endif
 198
 199 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
 200         {USB_DEVICE(0x08f2, 0x007f), .driver_info = DEVTYPE_GOTOP},
 201         {USB_DEVICE(0x08f2, 0x00ce), .driver_info = DEVTYPE_GOTOP},
 202         {USB_DEVICE(0x08f2, 0x00f4), .driver_info = DEVTYPE_GOTOP},
 203 #endif
 204
 205 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
 206         {USB_DEVICE(0x0f92, 0x0001), .driver_info = DEVTYPE_JASTEC},
 207 #endif
 208
 209 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
 210         {USB_DEVICE(0x1ac7, 0x0001), .driver_info = DEVTYPE_E2I},
 211 #endif
 212
 213 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
 214         {USB_DEVICE(0x14c8, 0x0003), .driver_info = DEVTYPE_ZYTRONIC},
 215 #endif
 216
 217 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
 218         /* TC5UH */
 219         {USB_DEVICE(0x0664, 0x0309), .driver_info = DEVTYPE_TC45USB},
 220         /* TC4UM */
 221         {USB_DEVICE(0x0664, 0x0306), .driver_info = DEVTYPE_TC45USB},
 222 #endif
 223
 224 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
 225         /* data interface only */
 226         {USB_DEVICE_AND_INTERFACE_INFO(0x10f0, 0x2002, 0x0a, 0x00, 0x00),
 227                 .driver_info = DEVTYPE_NEXIO},
 228         {USB_DEVICE_AND_INTERFACE_INFO(0x1870, 0x0001, 0x0a, 0x00, 0x00),
 229                 .driver_info = DEVTYPE_NEXIO},
 230 #endif
 231
 232 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
 233         {USB_DEVICE(0x04e7, 0x0020), .driver_info = DEVTYPE_ELO},
 234 #endif
 235
 236 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
 237         {USB_DEVICE(0x7374, 0x0001), .driver_info = DEVTYPE_ETOUCH},
 238 #endif
 239
 240         {}
 241 };
 242
 243
 244 /*****************************************************************************
 245  * e2i Part
 246  */
 247
 248 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
 249 static int e2i_init(struct usbtouch_usb *usbtouch)
 250 {
 251         int ret;
 252         struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
 253
 254         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 255                               0x01, 0x02, 0x0000, 0x0081,
 256                               NULL, 0, USB_CTRL_SET_TIMEOUT);
 257
 258         dev_dbg(&usbtouch->interface->dev,
 259                 "%s - usb_control_msg - E2I_RESET - bytes|err: %d\n",
 260                 __func__, ret);
 261         return ret;
 262 }
 263
 264 static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 265 {
 266         int tmp = (pkt[0] << 8) | pkt[1];
 267         dev->x  = (pkt[2] << 8) | pkt[3];
 268         dev->y  = (pkt[4] << 8) | pkt[5];
 269
 270         tmp = tmp - 0xA000;
 271         dev->touch = (tmp > 0);
 272         dev->press = (tmp > 0 ? tmp : 0);
 273
 274         return 1;
 275 }
 276 #endif
 277
 278
 279 /*****************************************************************************
 280  * eGalax part
 281  */
 282
 283 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
 284
 285 #ifndef MULTI_PACKET
 286 #define MULTI_PACKET
 287 #endif
 288
 289 #define EGALAX_PKT_TYPE_MASK            0xFE
 290 #define EGALAX_PKT_TYPE_REPT            0x80
 291 #define EGALAX_PKT_TYPE_DIAG            0x0A
 292
 293 static int egalax_init(struct usbtouch_usb *usbtouch)
 294 {
 295         int ret, i;
 296         unsigned char *buf;
 297         struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
 298
 299         /*
 300          * An eGalax diagnostic packet kicks the device into using the right
 301          * protocol.  We send a "check active" packet.  The response will be
 302          * read later and ignored.
 303          */
 304
 305         buf = kmalloc(3, GFP_KERNEL);
 306         if (!buf)
 307                 return -ENOMEM;
 308
 309         buf[0] = EGALAX_PKT_TYPE_DIAG;
 310         buf[1] = 1;     /* length */
 311         buf[2] = 'A';   /* command - check active */
 312
 313         for (i = 0; i < 3; i++) {
 314                 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 315                                       0,
 316                                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 317                                       0, 0, buf, 3,
 318                                       USB_CTRL_SET_TIMEOUT);
 319                 if (ret >= 0) {
 320                         ret = 0;
 321                         break;
 322                 }
 323                 if (ret != -EPIPE)
 324                         break;
 325         }
 326
 327         kfree(buf);
 328
 329         return ret;
 330 }
 331
 332 static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 333 {
 334         if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
 335                 return 0;
 336
 337         dev->x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
 338         dev->y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
 339         dev->touch = pkt[0] & 0x01;
 340
 341         return 1;
 342 }
 343
 344 static int egalax_get_pkt_len(unsigned char *buf, int len)
 345 {
 346         switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
 347         case EGALAX_PKT_TYPE_REPT:
 348                 return 5;
 349
 350         case EGALAX_PKT_TYPE_DIAG:
 351                 if (len < 2)
 352                         return -1;
 353
 354                 return buf[1] + 2;
 355         }
 356
 357         return 0;
 358 }
 359 #endif
 360
 361 /*****************************************************************************
 362  * EasyTouch part
 363  */
 364
 365 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
 366
 367 #ifndef MULTI_PACKET
 368 #define MULTI_PACKET
 369 #endif
 370
 371 #define ETOUCH_PKT_TYPE_MASK            0xFE
 372 #define ETOUCH_PKT_TYPE_REPT            0x80
 373 #define ETOUCH_PKT_TYPE_REPT2           0xB0
 374 #define ETOUCH_PKT_TYPE_DIAG            0x0A
 375
 376 static int etouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 377 {
 378         if ((pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT &&
 379                 (pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT2)
 380                 return 0;
 381
 382         dev->x = ((pkt[1] & 0x1F) << 7) | (pkt[2] & 0x7F);
 383         dev->y = ((pkt[3] & 0x1F) << 7) | (pkt[4] & 0x7F);
 384         dev->touch = pkt[0] & 0x01;
 385
 386         return 1;
 387 }
 388
 389 static int etouch_get_pkt_len(unsigned char *buf, int len)
 390 {
 391         switch (buf[0] & ETOUCH_PKT_TYPE_MASK) {
 392         case ETOUCH_PKT_TYPE_REPT:
 393         case ETOUCH_PKT_TYPE_REPT2:
 394                 return 5;
 395
 396         case ETOUCH_PKT_TYPE_DIAG:
 397                 if (len < 2)
 398                         return -1;
 399
 400                 return buf[1] + 2;
 401         }
 402
 403         return 0;
 404 }
 405 #endif
 406
 407 /*****************************************************************************
 408  * PanJit Part
 409  */
 410 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
 411 static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 412 {
 413         dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
 414         dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
 415         dev->touch = pkt[0] & 0x01;
 416
 417         return 1;
 418 }
 419 #endif
 420
 421
 422 /*****************************************************************************
 423  * 3M/Microtouch Part
 424  */
 425 #ifdef CONFIG_TOUCHSCREEN_USB_3M
 426
 427 #define MTOUCHUSB_ASYNC_REPORT          1
 428 #define MTOUCHUSB_RESET                 7
 429 #define MTOUCHUSB_REQ_CTRLLR_ID         10
 430
 431 #define MTOUCHUSB_REQ_CTRLLR_ID_LEN     16
 432
 433 static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 434 {
 435         if (hwcalib_xy) {
 436                 dev->x = (pkt[4] << 8) | pkt[3];
 437                 dev->y = 0xffff - ((pkt[6] << 8) | pkt[5]);
 438         } else {
 439                 dev->x = (pkt[8] << 8) | pkt[7];
 440                 dev->y = (pkt[10] << 8) | pkt[9];
 441         }
 442         dev->touch = (pkt[2] & 0x40) ? 1 : 0;
 443
 444         return 1;
 445 }
 446
 447 struct mtouch_priv {
 448         u8 fw_rev_major;
 449         u8 fw_rev_minor;
 450 };
 451
 452 static ssize_t mtouch_firmware_rev_show(struct device *dev,
 453                                 struct device_attribute *attr, char *output)
 454 {
 455         struct usb_interface *intf = to_usb_interface(dev);
 456         struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
 457         struct mtouch_priv *priv = usbtouch->priv;
 458
 459         return scnprintf(output, PAGE_SIZE, "%1x.%1x\n",
 460                          priv->fw_rev_major, priv->fw_rev_minor);
 461 }
 462 static DEVICE_ATTR(firmware_rev, 0444, mtouch_firmware_rev_show, NULL);
 463
 464 static struct attribute *mtouch_attrs[] = {
 465         &dev_attr_firmware_rev.attr,
 466         NULL
 467 };
 468
 469 static const struct attribute_group mtouch_attr_group = {
 470         .attrs = mtouch_attrs,
 471 };
 472
 473 static int mtouch_get_fw_revision(struct usbtouch_usb *usbtouch)
 474 {
 475         struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
 476         struct mtouch_priv *priv = usbtouch->priv;
 477         u8 *buf;
 478         int ret;
 479
 480         buf = kzalloc(MTOUCHUSB_REQ_CTRLLR_ID_LEN, GFP_NOIO);
 481         if (!buf)
 482                 return -ENOMEM;
 483
 484         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 485                               MTOUCHUSB_REQ_CTRLLR_ID,
 486                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 487                               0, 0, buf, MTOUCHUSB_REQ_CTRLLR_ID_LEN,
 488                               USB_CTRL_SET_TIMEOUT);
 489         if (ret != MTOUCHUSB_REQ_CTRLLR_ID_LEN) {
 490                 dev_warn(&usbtouch->interface->dev,
 491                          "Failed to read FW rev: %d\n", ret);
 492                 ret = ret < 0 ? ret : -EIO;
 493                 goto free;
 494         }
 495
 496         priv->fw_rev_major = buf[3];
 497         priv->fw_rev_minor = buf[4];
 498
 499         ret = 0;
 500
 501 free:
 502         kfree(buf);
 503         return ret;
 504 }
 505
 506 static int mtouch_alloc(struct usbtouch_usb *usbtouch)
 507 {
 508         int ret;
 509
 510         usbtouch->priv = kmalloc(sizeof(struct mtouch_priv), GFP_KERNEL);
 511         if (!usbtouch->priv)
 512                 return -ENOMEM;
 513
 514         ret = sysfs_create_group(&usbtouch->interface->dev.kobj,
 515                                  &mtouch_attr_group);
 516         if (ret) {
 517                 kfree(usbtouch->priv);
 518                 usbtouch->priv = NULL;
 519                 return ret;
 520         }
 521
 522         return 0;
 523 }
 524
 525 static int mtouch_init(struct usbtouch_usb *usbtouch)
 526 {
 527         int ret, i;
 528         struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
 529
 530         ret = mtouch_get_fw_revision(usbtouch);
 531         if (ret)
 532                 return ret;
 533
 534         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 535                               MTOUCHUSB_RESET,
 536                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 537                               1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
 538         dev_dbg(&usbtouch->interface->dev,
 539                 "%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d\n",
 540                 __func__, ret);
 541         if (ret < 0)
 542                 return ret;
 543         msleep(150);
 544
 545         for (i = 0; i < 3; i++) {
 546                 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 547                                       MTOUCHUSB_ASYNC_REPORT,
 548                                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 549                                       1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
 550                 dev_dbg(&usbtouch->interface->dev,
 551                         "%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d\n",
 552                         __func__, ret);
 553                 if (ret >= 0)
 554                         break;
 555                 if (ret != -EPIPE)
 556                         return ret;
 557         }
 558
 559         /* Default min/max xy are the raw values, override if using hw-calib */
 560         if (hwcalib_xy) {
 561                 input_set_abs_params(usbtouch->input, ABS_X, 0, 0xffff, 0, 0);
 562                 input_set_abs_params(usbtouch->input, ABS_Y, 0, 0xffff, 0, 0);
 563         }
 564
 565         return 0;
 566 }
 567
 568 static void mtouch_exit(struct usbtouch_usb *usbtouch)
 569 {
 570         struct mtouch_priv *priv = usbtouch->priv;
 571
 572         sysfs_remove_group(&usbtouch->interface->dev.kobj, &mtouch_attr_group);
 573         kfree(priv);
 574 }
 575 #endif
 576
 577
 578 /*****************************************************************************
 579  * ITM Part
 580  */
 581 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
 582 static int itm_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 583 {
 584         int touch;
 585         /*
 586          * ITM devices report invalid x/y data if not touched.
 587          * if the screen was touched before but is not touched any more
 588          * report touch as 0 with the last valid x/y data once. then stop
 589          * reporting data until touched again.
 590          */
 591         dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
 592
 593         touch = ~pkt[7] & 0x20;
 594         if (!touch) {
 595                 if (dev->touch) {
 596                         dev->touch = 0;
 597                         return 1;
 598                 }
 599
 600                 return 0;
 601         }
 602
 603         dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
 604         dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
 605         dev->touch = touch;
 606
 607         return 1;
 608 }
 609 #endif
 610
 611
 612 /*****************************************************************************
 613  * eTurboTouch part
 614  */
 615 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
 616 #ifndef MULTI_PACKET
 617 #define MULTI_PACKET
 618 #endif
 619 static int eturbo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 620 {
 621         unsigned int shift;
 622
 623         /* packets should start with sync */
 624         if (!(pkt[0] & 0x80))
 625                 return 0;
 626
 627         shift = (6 - (pkt[0] & 0x03));
 628         dev->x = ((pkt[3] << 7) | pkt[4]) >> shift;
 629         dev->y = ((pkt[1] << 7) | pkt[2]) >> shift;
 630         dev->touch = (pkt[0] & 0x10) ? 1 : 0;
 631
 632         return 1;
 633 }
 634
 635 static int eturbo_get_pkt_len(unsigned char *buf, int len)
 636 {
 637         if (buf[0] & 0x80)
 638                 return 5;
 639         if (buf[0] == 0x01)
 640                 return 3;
 641         return 0;
 642 }
 643 #endif
 644
 645
 646 /*****************************************************************************
 647  * Gunze part
 648  */
 649 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
 650 static int gunze_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 651 {
 652         if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
 653                 return 0;
 654
 655         dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
 656         dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
 657         dev->touch = pkt[0] & 0x20;
 658
 659         return 1;
 660 }
 661 #endif
 662
 663 /*****************************************************************************
 664  * DMC TSC-10/25 Part
 665  *
 666  * Documentation about the controller and it's protocol can be found at
 667  *   http://www.dmccoltd.com/files/controler/tsc10usb_pi_e.pdf
 668  *   http://www.dmccoltd.com/files/controler/tsc25_usb_e.pdf
 669  */
 670 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
 671
 672 /* supported data rates. currently using 130 */
 673 #define TSC10_RATE_POINT        0x50
 674 #define TSC10_RATE_30           0x40
 675 #define TSC10_RATE_50           0x41
 676 #define TSC10_RATE_80           0x42
 677 #define TSC10_RATE_100          0x43
 678 #define TSC10_RATE_130          0x44
 679 #define TSC10_RATE_150          0x45
 680
 681 /* commands */
 682 #define TSC10_CMD_RESET         0x55
 683 #define TSC10_CMD_RATE          0x05
 684 #define TSC10_CMD_DATA1         0x01
 685
 686 static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
 687 {
 688         struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
 689         int ret = -ENOMEM;
 690         unsigned char *buf;
 691
 692         buf = kmalloc(2, GFP_NOIO);
 693         if (!buf)
 694                 goto err_nobuf;
 695         /* reset */
 696         buf[0] = buf[1] = 0xFF;
 697         ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
 698                               TSC10_CMD_RESET,
 699                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 700                               0, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
 701         if (ret < 0)
 702                 goto err_out;
 703         if (buf[0] != 0x06) {
 704                 ret = -ENODEV;
 705                 goto err_out;
 706         }
 707
 708         /* TSC-25 data sheet specifies a delay after the RESET command */
 709         msleep(150);
 710
 711         /* set coordinate output rate */
 712         buf[0] = buf[1] = 0xFF;
 713         ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
 714                               TSC10_CMD_RATE,
 715                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 716                               TSC10_RATE_150, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
 717         if (ret < 0)
 718                 goto err_out;
 719         if ((buf[0] != 0x06) && (buf[0] != 0x15 || buf[1] != 0x01)) {
 720                 ret = -ENODEV;
 721                 goto err_out;
 722         }
 723
 724         /* start sending data */
 725         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 726                               TSC10_CMD_DATA1,
 727                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 728                               0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
 729 err_out:
 730         kfree(buf);
 731 err_nobuf:
 732         return ret;
 733 }
 734
 735
 736 static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 737 {
 738         dev->x = ((pkt[2] & 0x03) << 8) | pkt[1];
 739         dev->y = ((pkt[4] & 0x03) << 8) | pkt[3];
 740         dev->touch = pkt[0] & 0x01;
 741
 742         return 1;
 743 }
 744 #endif
 745
 746
 747 /*****************************************************************************
 748  * IRTOUCH Part
 749  */
 750 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
 751 static int irtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 752 {
 753         dev->x = (pkt[3] << 8) | pkt[2];
 754         dev->y = (pkt[5] << 8) | pkt[4];
 755         dev->touch = (pkt[1] & 0x03) ? 1 : 0;
 756
 757         return 1;
 758 }
 759 #endif
 760
 761 /*****************************************************************************
 762  * ET&T TC5UH/TC4UM part
 763  */
 764 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
 765 static int tc45usb_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 766 {
 767         dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
 768         dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
 769         dev->touch = pkt[0] & 0x01;
 770
 771         return 1;
 772 }
 773 #endif
 774
 775 /*****************************************************************************
 776  * IdealTEK URTC1000 Part
 777  */
 778 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
 779 #ifndef MULTI_PACKET
 780 #define MULTI_PACKET
 781 #endif
 782 static int idealtek_get_pkt_len(unsigned char *buf, int len)
 783 {
 784         if (buf[0] & 0x80)
 785                 return 5;
 786         if (buf[0] == 0x01)
 787                 return len;
 788         return 0;
 789 }
 790
 791 static int idealtek_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 792 {
 793         switch (pkt[0] & 0x98) {
 794         case 0x88:
 795                 /* touch data in IdealTEK mode */
 796                 dev->x = (pkt[1] << 5) | (pkt[2] >> 2);
 797                 dev->y = (pkt[3] << 5) | (pkt[4] >> 2);
 798                 dev->touch = (pkt[0] & 0x40) ? 1 : 0;
 799                 return 1;
 800
 801         case 0x98:
 802                 /* touch data in MT emulation mode */
 803                 dev->x = (pkt[2] << 5) | (pkt[1] >> 2);
 804                 dev->y = (pkt[4] << 5) | (pkt[3] >> 2);
 805                 dev->touch = (pkt[0] & 0x40) ? 1 : 0;
 806                 return 1;
 807
 808         default:
 809                 return 0;
 810         }
 811 }
 812 #endif
 813
 814 /*****************************************************************************
 815  * General Touch Part
 816  */
 817 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
 818 static int general_touch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 819 {
 820         dev->x = (pkt[2] << 8) | pkt[1];
 821         dev->y = (pkt[4] << 8) | pkt[3];
 822         dev->press = pkt[5] & 0xff;
 823         dev->touch = pkt[0] & 0x01;
 824
 825         return 1;
 826 }
 827 #endif
 828
 829 /*****************************************************************************
 830  * GoTop Part
 831  */
 832 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
 833 static int gotop_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 834 {
 835         dev->x = ((pkt[1] & 0x38) << 4) | pkt[2];
 836         dev->y = ((pkt[1] & 0x07) << 7) | pkt[3];
 837         dev->touch = pkt[0] & 0x01;
 838
 839         return 1;
 840 }
 841 #endif
 842
 843 /*****************************************************************************
 844  * JASTEC Part
 845  */
 846 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
 847 static int jastec_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 848 {
 849         dev->x = ((pkt[0] & 0x3f) << 6) | (pkt[2] & 0x3f);
 850         dev->y = ((pkt[1] & 0x3f) << 6) | (pkt[3] & 0x3f);
 851         dev->touch = (pkt[0] & 0x40) >> 6;
 852
 853         return 1;
 854 }
 855 #endif
 856
 857 /*****************************************************************************
 858  * Zytronic Part
 859  */
 860 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
 861 static int zytronic_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 862 {
 863         struct usb_interface *intf = dev->interface;
 864
 865         switch (pkt[0]) {
 866         case 0x3A: /* command response */
 867                 dev_dbg(&intf->dev, "%s: Command response %d\n", __func__, pkt[1]);
 868                 break;
 869
 870         case 0xC0: /* down */
 871                 dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
 872                 dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
 873                 dev->touch = 1;
 874                 dev_dbg(&intf->dev, "%s: down %d,%d\n", __func__, dev->x, dev->y);
 875                 return 1;
 876
 877         case 0x80: /* up */
 878                 dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
 879                 dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
 880                 dev->touch = 0;
 881                 dev_dbg(&intf->dev, "%s: up %d,%d\n", __func__, dev->x, dev->y);
 882                 return 1;
 883
 884         default:
 885                 dev_dbg(&intf->dev, "%s: Unknown return %d\n", __func__, pkt[0]);
 886                 break;
 887         }
 888
 889         return 0;
 890 }
 891 #endif
 892
 893 /*****************************************************************************
 894  * NEXIO Part
 895  */
 896 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
 897
 898 #define NEXIO_TIMEOUT   5000
 899 #define NEXIO_BUFSIZE   1024
 900 #define NEXIO_THRESHOLD 50
 901
 902 struct nexio_priv {
 903         struct urb *ack;
 904         unsigned char *ack_buf;
 905 };
 906
 907 struct nexio_touch_packet {
 908         u8      flags;          /* 0xe1 = touch, 0xe1 = release */
 909         __be16  data_len;       /* total bytes of touch data */
 910         __be16  x_len;          /* bytes for X axis */
 911         __be16  y_len;          /* bytes for Y axis */
 912         u8      data[];
 913 } __attribute__ ((packed));
 914
 915 static unsigned char nexio_ack_pkt[2] = { 0xaa, 0x02 };
 916 static unsigned char nexio_init_pkt[4] = { 0x82, 0x04, 0x0a, 0x0f };
 917
 918 static void nexio_ack_complete(struct urb *urb)
 919 {
 920 }
 921
 922 static int nexio_alloc(struct usbtouch_usb *usbtouch)
 923 {
 924         struct nexio_priv *priv;
 925         int ret = -ENOMEM;
 926
 927         usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
 928         if (!usbtouch->priv)
 929                 goto out_buf;
 930
 931         priv = usbtouch->priv;
 932
 933         priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
 934                                 GFP_KERNEL);
 935         if (!priv->ack_buf)
 936                 goto err_priv;
 937
 938         priv->ack = usb_alloc_urb(0, GFP_KERNEL);
 939         if (!priv->ack) {
 940                 dev_dbg(&usbtouch->interface->dev,
 941                         "%s - usb_alloc_urb failed: usbtouch->ack\n", __func__);
 942                 goto err_ack_buf;
 943         }
 944
 945         return 0;
 946
 947 err_ack_buf:
 948         kfree(priv->ack_buf);
 949 err_priv:
 950         kfree(priv);
 951 out_buf:
 952         return ret;
 953 }
 954
 955 static int nexio_init(struct usbtouch_usb *usbtouch)
 956 {
 957         struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
 958         struct usb_host_interface *interface = usbtouch->interface->cur_altsetting;
 959         struct nexio_priv *priv = usbtouch->priv;
 960         int ret = -ENOMEM;
 961         int actual_len, i;
 962         unsigned char *buf;
 963         char *firmware_ver = NULL, *device_name = NULL;
 964         int input_ep = 0, output_ep = 0;
 965
 966         /* find first input and output endpoint */
 967         for (i = 0; i < interface->desc.bNumEndpoints; i++) {
 968                 if (!input_ep &&
 969                     usb_endpoint_dir_in(&interface->endpoint[i].desc))
 970                         input_ep = interface->endpoint[i].desc.bEndpointAddress;
 971                 if (!output_ep &&
 972                     usb_endpoint_dir_out(&interface->endpoint[i].desc))
 973                         output_ep = interface->endpoint[i].desc.bEndpointAddress;
 974         }
 975         if (!input_ep || !output_ep)
 976                 return -ENXIO;
 977
 978         buf = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
 979         if (!buf)
 980                 goto out_buf;
 981
 982         /* two empty reads */
 983         for (i = 0; i < 2; i++) {
 984                 ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
 985                                    buf, NEXIO_BUFSIZE, &actual_len,
 986                                    NEXIO_TIMEOUT);
 987                 if (ret < 0)
 988                         goto out_buf;
 989         }
 990
 991         /* send init command */
 992         memcpy(buf, nexio_init_pkt, sizeof(nexio_init_pkt));
 993         ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, output_ep),
 994                            buf, sizeof(nexio_init_pkt), &actual_len,
 995                            NEXIO_TIMEOUT);
 996         if (ret < 0)
 997                 goto out_buf;
 998
 999         /* read replies */
1000         for (i = 0; i < 3; i++) {
1001                 memset(buf, 0, NEXIO_BUFSIZE);
1002                 ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
1003                                    buf, NEXIO_BUFSIZE, &actual_len,
1004                                    NEXIO_TIMEOUT);
1005                 if (ret < 0 || actual_len < 1 || buf[1] != actual_len)
1006                         continue;
1007                 switch (buf[0]) {
1008                 case 0x83:      /* firmware version */
1009                         if (!firmware_ver)
1010                                 firmware_ver = kstrdup(&buf[2], GFP_NOIO);
1011                         break;
1012                 case 0x84:      /* device name */
1013                         if (!device_name)
1014                                 device_name = kstrdup(&buf[2], GFP_NOIO);
1015                         break;
1016                 }
1017         }
1018
1019         printk(KERN_INFO "Nexio device: %s, firmware version: %s\n",
1020                device_name, firmware_ver);
1021
1022         kfree(firmware_ver);
1023         kfree(device_name);
1024
1025         usb_fill_bulk_urb(priv->ack, dev, usb_sndbulkpipe(dev, output_ep),
1026                           priv->ack_buf, sizeof(nexio_ack_pkt),
1027                           nexio_ack_complete, usbtouch);
1028         ret = 0;
1029
1030 out_buf:
1031         kfree(buf);
1032         return ret;
1033 }
1034
1035 static void nexio_exit(struct usbtouch_usb *usbtouch)
1036 {
1037         struct nexio_priv *priv = usbtouch->priv;
1038
1039         usb_kill_urb(priv->ack);
1040         usb_free_urb(priv->ack);
1041         kfree(priv->ack_buf);
1042         kfree(priv);
1043 }
1044
1045 static int nexio_read_data(struct usbtouch_usb *usbtouch, unsigned char *pkt)
1046 {
1047         struct device *dev = &usbtouch->interface->dev;
1048         struct nexio_touch_packet *packet = (void *) pkt;
1049         struct nexio_priv *priv = usbtouch->priv;
1050         unsigned int data_len = be16_to_cpu(packet->data_len);
1051         unsigned int x_len = be16_to_cpu(packet->x_len);
1052         unsigned int y_len = be16_to_cpu(packet->y_len);
1053         int x, y, begin_x, begin_y, end_x, end_y, w, h, ret;
1054
1055         /* got touch data? */
1056         if ((pkt[0] & 0xe0) != 0xe0)
1057                 return 0;
1058
1059         if (data_len > 0xff)
1060                 data_len -= 0x100;
1061         if (x_len > 0xff)
1062                 x_len -= 0x80;
1063
1064         /* send ACK */
1065         ret = usb_submit_urb(priv->ack, GFP_ATOMIC);
1066         if (ret)
1067                 dev_warn(dev, "Failed to submit ACK URB: %d\n", ret);
1068
1069         if (!usbtouch->type->max_xc) {
1070                 usbtouch->type->max_xc = 2 * x_len;
1071                 input_set_abs_params(usbtouch->input, ABS_X,
1072                                      0, usbtouch->type->max_xc, 0, 0);
1073                 usbtouch->type->max_yc = 2 * y_len;
1074                 input_set_abs_params(usbtouch->input, ABS_Y,
1075                                      0, usbtouch->type->max_yc, 0, 0);
1076         }
1077         /*
1078          * The device reports state of IR sensors on X and Y axes.
1079          * Each byte represents "darkness" percentage (0-100) of one element.
1080          * 17" touchscreen reports only 64 x 52 bytes so the resolution is low.
1081          * This also means that there's a limited multi-touch capability but
1082          * it's disabled (and untested) here as there's no X driver for that.
1083          */
1084         begin_x = end_x = begin_y = end_y = -1;
1085         for (x = 0; x < x_len; x++) {
1086                 if (begin_x == -1 && packet->data[x] > NEXIO_THRESHOLD) {
1087                         begin_x = x;
1088                         continue;
1089                 }
1090                 if (end_x == -1 && begin_x != -1 && packet->data[x] < NEXIO_THRESHOLD) {
1091                         end_x = x - 1;
1092                         for (y = x_len; y < data_len; y++) {
1093                                 if (begin_y == -1 && packet->data[y] > NEXIO_THRESHOLD) {
1094                                         begin_y = y - x_len;
1095                                         continue;
1096                                 }
1097                                 if (end_y == -1 &&
1098                                     begin_y != -1 && packet->data[y] < NEXIO_THRESHOLD) {
1099                                         end_y = y - 1 - x_len;
1100                                         w = end_x - begin_x;
1101                                         h = end_y - begin_y;
1102 #if 0
1103                                         /* multi-touch */
1104                                         input_report_abs(usbtouch->input,
1105                                                     ABS_MT_TOUCH_MAJOR, max(w,h));
1106                                         input_report_abs(usbtouch->input,
1107                                                     ABS_MT_TOUCH_MINOR, min(x,h));
1108                                         input_report_abs(usbtouch->input,
1109                                                     ABS_MT_POSITION_X, 2*begin_x+w);
1110                                         input_report_abs(usbtouch->input,
1111                                                     ABS_MT_POSITION_Y, 2*begin_y+h);
1112                                         input_report_abs(usbtouch->input,
1113                                                     ABS_MT_ORIENTATION, w > h);
1114                                         input_mt_sync(usbtouch->input);
1115 #endif
1116                                         /* single touch */
1117                                         usbtouch->x = 2 * begin_x + w;
1118                                         usbtouch->y = 2 * begin_y + h;
1119                                         usbtouch->touch = packet->flags & 0x01;
1120                                         begin_y = end_y = -1;
1121                                         return 1;
1122                                 }
1123                         }
1124                         begin_x = end_x = -1;
1125                 }
1126
1127         }
1128         return 0;
1129 }
1130 #endif
1131
1132
1133 /*****************************************************************************
1134  * ELO part
1135  */
1136
1137 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
1138
1139 static int elo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
1140 {
1141         dev->x = (pkt[3] << 8) | pkt[2];
1142         dev->y = (pkt[5] << 8) | pkt[4];
1143         dev->touch = pkt[6] > 0;
1144         dev->press = pkt[6];
1145
1146         return 1;
1147 }
1148 #endif
1149
1150
1151 /*****************************************************************************
1152  * the different device descriptors
1153  */
1154 #ifdef MULTI_PACKET
1155 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
1156                                    unsigned char *pkt, int len);
1157 #endif
1158
1159 static struct usbtouch_device_info usbtouch_dev_info[] = {
1160 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
1161         [DEVTYPE_ELO] = {
1162                 .min_xc         = 0x0,
1163                 .max_xc         = 0x0fff,
1164                 .min_yc         = 0x0,
1165                 .max_yc         = 0x0fff,
1166                 .max_press      = 0xff,
1167                 .rept_size      = 8,
1168                 .read_data      = elo_read_data,
1169         },
1170 #endif
1171
1172 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
1173         [DEVTYPE_EGALAX] = {
1174                 .min_xc         = 0x0,
1175                 .max_xc         = 0x07ff,
1176                 .min_yc         = 0x0,
1177                 .max_yc         = 0x07ff,
1178                 .rept_size      = 16,
1179                 .process_pkt    = usbtouch_process_multi,
1180                 .get_pkt_len    = egalax_get_pkt_len,
1181                 .read_data      = egalax_read_data,
1182                 .init           = egalax_init,
1183         },
1184 #endif
1185
1186 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
1187         [DEVTYPE_PANJIT] = {
1188                 .min_xc         = 0x0,
1189                 .max_xc         = 0x0fff,
1190                 .min_yc         = 0x0,
1191                 .max_yc         = 0x0fff,
1192                 .rept_size      = 8,
1193                 .read_data      = panjit_read_data,
1194         },
1195 #endif
1196
1197 #ifdef CONFIG_TOUCHSCREEN_USB_3M
1198         [DEVTYPE_3M] = {
1199                 .min_xc         = 0x0,
1200                 .max_xc         = 0x4000,
1201                 .min_yc         = 0x0,
1202                 .max_yc         = 0x4000,
1203                 .rept_size      = 11,
1204                 .read_data      = mtouch_read_data,
1205                 .alloc          = mtouch_alloc,
1206                 .init           = mtouch_init,
1207                 .exit           = mtouch_exit,
1208         },
1209 #endif
1210
1211 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
1212         [DEVTYPE_ITM] = {
1213                 .min_xc         = 0x0,
1214                 .max_xc         = 0x0fff,
1215                 .min_yc         = 0x0,
1216                 .max_yc         = 0x0fff,
1217                 .max_press      = 0xff,
1218                 .rept_size      = 8,
1219                 .read_data      = itm_read_data,
1220         },
1221 #endif
1222
1223 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
1224         [DEVTYPE_ETURBO] = {
1225                 .min_xc         = 0x0,
1226                 .max_xc         = 0x07ff,
1227                 .min_yc         = 0x0,
1228                 .max_yc         = 0x07ff,
1229                 .rept_size      = 8,
1230                 .process_pkt    = usbtouch_process_multi,
1231                 .get_pkt_len    = eturbo_get_pkt_len,
1232                 .read_data      = eturbo_read_data,
1233         },
1234 #endif
1235
1236 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
1237         [DEVTYPE_GUNZE] = {
1238                 .min_xc         = 0x0,
1239                 .max_xc         = 0x0fff,
1240                 .min_yc         = 0x0,
1241                 .max_yc         = 0x0fff,
1242                 .rept_size      = 4,
1243                 .read_data      = gunze_read_data,
1244         },
1245 #endif
1246
1247 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
1248         [DEVTYPE_DMC_TSC10] = {
1249                 .min_xc         = 0x0,
1250                 .max_xc         = 0x03ff,
1251                 .min_yc         = 0x0,
1252                 .max_yc         = 0x03ff,
1253                 .rept_size      = 5,
1254                 .init           = dmc_tsc10_init,
1255                 .read_data      = dmc_tsc10_read_data,
1256         },
1257 #endif
1258
1259 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
1260         [DEVTYPE_IRTOUCH] = {
1261                 .min_xc         = 0x0,
1262                 .max_xc         = 0x0fff,
1263                 .min_yc         = 0x0,
1264                 .max_yc         = 0x0fff,
1265                 .rept_size      = 8,
1266                 .read_data      = irtouch_read_data,
1267         },
1268
1269         [DEVTYPE_IRTOUCH_HIRES] = {
1270                 .min_xc         = 0x0,
1271                 .max_xc         = 0x7fff,
1272                 .min_yc         = 0x0,
1273                 .max_yc         = 0x7fff,
1274                 .rept_size      = 8,
1275                 .read_data      = irtouch_read_data,
1276         },
1277 #endif
1278
1279 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
1280         [DEVTYPE_IDEALTEK] = {
1281                 .min_xc         = 0x0,
1282                 .max_xc         = 0x0fff,
1283                 .min_yc         = 0x0,
1284                 .max_yc         = 0x0fff,
1285                 .rept_size      = 8,
1286                 .process_pkt    = usbtouch_process_multi,
1287                 .get_pkt_len    = idealtek_get_pkt_len,
1288                 .read_data      = idealtek_read_data,
1289         },
1290 #endif
1291
1292 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
1293         [DEVTYPE_GENERAL_TOUCH] = {
1294                 .min_xc         = 0x0,
1295                 .max_xc         = 0x7fff,
1296                 .min_yc         = 0x0,
1297                 .max_yc         = 0x7fff,
1298                 .rept_size      = 7,
1299                 .read_data      = general_touch_read_data,
1300         },
1301 #endif
1302
1303 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
1304         [DEVTYPE_GOTOP] = {
1305                 .min_xc         = 0x0,
1306                 .max_xc         = 0x03ff,
1307                 .min_yc         = 0x0,
1308                 .max_yc         = 0x03ff,
1309                 .rept_size      = 4,
1310                 .read_data      = gotop_read_data,
1311         },
1312 #endif
1313
1314 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
1315         [DEVTYPE_JASTEC] = {
1316                 .min_xc         = 0x0,
1317                 .max_xc         = 0x0fff,
1318                 .min_yc         = 0x0,
1319                 .max_yc         = 0x0fff,
1320                 .rept_size      = 4,
1321                 .read_data      = jastec_read_data,
1322         },
1323 #endif
1324
1325 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
1326         [DEVTYPE_E2I] = {
1327                 .min_xc         = 0x0,
1328                 .max_xc         = 0x7fff,
1329                 .min_yc         = 0x0,
1330                 .max_yc         = 0x7fff,
1331                 .rept_size      = 6,
1332                 .init           = e2i_init,
1333                 .read_data      = e2i_read_data,
1334         },
1335 #endif
1336
1337 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
1338         [DEVTYPE_ZYTRONIC] = {
1339                 .min_xc         = 0x0,
1340                 .max_xc         = 0x03ff,
1341                 .min_yc         = 0x0,
1342                 .max_yc         = 0x03ff,
1343                 .rept_size      = 5,
1344                 .read_data      = zytronic_read_data,
1345                 .irq_always     = true,
1346         },
1347 #endif
1348
1349 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
1350         [DEVTYPE_TC45USB] = {
1351                 .min_xc         = 0x0,
1352                 .max_xc         = 0x0fff,
1353                 .min_yc         = 0x0,
1354                 .max_yc         = 0x0fff,
1355                 .rept_size      = 5,
1356                 .read_data      = tc45usb_read_data,
1357         },
1358 #endif
1359
1360 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
1361         [DEVTYPE_NEXIO] = {
1362                 .rept_size      = 1024,
1363                 .irq_always     = true,
1364                 .read_data      = nexio_read_data,
1365                 .alloc          = nexio_alloc,
1366                 .init           = nexio_init,
1367                 .exit           = nexio_exit,
1368         },
1369 #endif
1370 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
1371         [DEVTYPE_ETOUCH] = {
1372                 .min_xc         = 0x0,
1373                 .max_xc         = 0x07ff,
1374                 .min_yc         = 0x0,
1375                 .max_yc         = 0x07ff,
1376                 .rept_size      = 16,
1377                 .process_pkt    = usbtouch_process_multi,
1378                 .get_pkt_len    = etouch_get_pkt_len,
1379                 .read_data      = etouch_read_data,
1380         },
1381 #endif
1382 };
1383
1384
1385 /*****************************************************************************
1386  * Generic Part
1387  */
1388 static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
1389                                  unsigned char *pkt, int len)
1390 {
1391         struct usbtouch_device_info *type = usbtouch->type;
1392
1393         if (!type->read_data(usbtouch, pkt))
1394                         return;
1395
1396         input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);
1397
1398         if (swap_xy) {
1399                 input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
1400                 input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
1401         } else {
1402                 input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
1403                 input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
1404         }
1405         if (type->max_press)
1406                 input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
1407         input_sync(usbtouch->input);
1408 }
1409
1410
1411 #ifdef MULTI_PACKET
1412 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
1413                                    unsigned char *pkt, int len)
1414 {
1415         unsigned char *buffer;
1416         int pkt_len, pos, buf_len, tmp;
1417
1418         /* process buffer */
1419         if (unlikely(usbtouch->buf_len)) {
1420                 /* try to get size */
1421                 pkt_len = usbtouch->type->get_pkt_len(
1422                                 usbtouch->buffer, usbtouch->buf_len);
1423
1424                 /* drop? */
1425                 if (unlikely(!pkt_len))
1426                         goto out_flush_buf;
1427
1428                 /* need to append -pkt_len bytes before able to get size */
1429                 if (unlikely(pkt_len < 0)) {
1430                         int append = -pkt_len;
1431                         if (unlikely(append > len))
1432                                append = len;
1433                         if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
1434                                 goto out_flush_buf;
1435                         memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
1436                         usbtouch->buf_len += append;
1437
1438                         pkt_len = usbtouch->type->get_pkt_len(
1439                                         usbtouch->buffer, usbtouch->buf_len);
1440                         if (pkt_len < 0)
1441                                 return;
1442                 }
1443
1444                 /* append */
1445                 tmp = pkt_len - usbtouch->buf_len;
1446                 if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
1447                         goto out_flush_buf;
1448                 memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
1449                 usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);
1450
1451                 buffer = pkt + tmp;
1452                 buf_len = len - tmp;
1453         } else {
1454                 buffer = pkt;
1455                 buf_len = len;
1456         }
1457
1458         /* loop over the received packet, process */
1459         pos = 0;
1460         while (pos < buf_len) {
1461                 /* get packet len */
1462                 pkt_len = usbtouch->type->get_pkt_len(buffer + pos,
1463                                                         buf_len - pos);
1464
1465                 /* unknown packet: skip one byte */
1466                 if (unlikely(!pkt_len)) {
1467                         pos++;
1468                         continue;
1469                 }
1470
1471                 /* full packet: process */
1472                 if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
1473                         usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
1474                 } else {
1475                         /* incomplete packet: save in buffer */
1476                         memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
1477                         usbtouch->buf_len = buf_len - pos;
1478                         return;
1479                 }
1480                 pos += pkt_len;
1481         }
1482
1483 out_flush_buf:
1484         usbtouch->buf_len = 0;
1485         return;
1486 }
1487 #endif
1488
1489
1490 static void usbtouch_irq(struct urb *urb)
1491 {
1492         struct usbtouch_usb *usbtouch = urb->context;
1493         struct device *dev = &usbtouch->interface->dev;
1494         int retval;
1495
1496         switch (urb->status) {
1497         case 0:
1498                 /* success */
1499                 break;
1500         case -ETIME:
1501                 /* this urb is timing out */
1502                 dev_dbg(dev,
1503                         "%s - urb timed out - was the device unplugged?\n",
1504                         __func__);
1505                 return;
1506         case -ECONNRESET:
1507         case -ENOENT:
1508         case -ESHUTDOWN:
1509         case -EPIPE:
1510                 /* this urb is terminated, clean up */
1511                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1512                         __func__, urb->status);
1513                 return;
1514         default:
1515                 dev_dbg(dev, "%s - nonzero urb status received: %d\n",
1516                         __func__, urb->status);
1517                 goto exit;
1518         }
1519
1520         usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);
1521
1522 exit:
1523         usb_mark_last_busy(interface_to_usbdev(usbtouch->interface));
1524         retval = usb_submit_urb(urb, GFP_ATOMIC);
1525         if (retval)
1526                 dev_err(dev, "%s - usb_submit_urb failed with result: %d\n",
1527                         __func__, retval);
1528 }
1529
1530 static int usbtouch_open(struct input_dev *input)
1531 {
1532         struct usbtouch_usb *usbtouch = input_get_drvdata(input);
1533         int r;
1534
1535         usbtouch->irq->dev = interface_to_usbdev(usbtouch->interface);
1536
1537         r = usb_autopm_get_interface(usbtouch->interface) ? -EIO : 0;
1538         if (r < 0)
1539                 goto out;
1540
1541         mutex_lock(&usbtouch->pm_mutex);
1542         if (!usbtouch->type->irq_always) {
1543                 if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) {
1544                         r = -EIO;
1545                         goto out_put;
1546                 }
1547         }
1548
1549         usbtouch->interface->needs_remote_wakeup = 1;
1550         usbtouch->is_open = true;
1551 out_put:
1552         mutex_unlock(&usbtouch->pm_mutex);
1553         usb_autopm_put_interface(usbtouch->interface);
1554 out:
1555         return r;
1556 }
1557
1558 static void usbtouch_close(struct input_dev *input)
1559 {
1560         struct usbtouch_usb *usbtouch = input_get_drvdata(input);
1561         int r;
1562
1563         mutex_lock(&usbtouch->pm_mutex);
1564         if (!usbtouch->type->irq_always)
1565                 usb_kill_urb(usbtouch->irq);
1566         usbtouch->is_open = false;
1567         mutex_unlock(&usbtouch->pm_mutex);
1568
1569         r = usb_autopm_get_interface(usbtouch->interface);
1570         usbtouch->interface->needs_remote_wakeup = 0;
1571         if (!r)
1572                 usb_autopm_put_interface(usbtouch->interface);
1573 }
1574
1575 static int usbtouch_suspend
1576 (struct usb_interface *intf, pm_message_t message)
1577 {
1578         struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1579
1580         usb_kill_urb(usbtouch->irq);
1581
1582         return 0;
1583 }
1584
1585 static int usbtouch_resume(struct usb_interface *intf)
1586 {
1587         struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1588         int result = 0;
1589
1590         mutex_lock(&usbtouch->pm_mutex);
1591         if (usbtouch->is_open || usbtouch->type->irq_always)
1592                 result = usb_submit_urb(usbtouch->irq, GFP_NOIO);
1593         mutex_unlock(&usbtouch->pm_mutex);
1594
1595         return result;
1596 }
1597
1598 static int usbtouch_reset_resume(struct usb_interface *intf)
1599 {
1600         struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1601         int err = 0;
1602
1603         /* reinit the device */
1604         if (usbtouch->type->init) {
1605                 err = usbtouch->type->init(usbtouch);
1606                 if (err) {
1607                         dev_dbg(&intf->dev,
1608                                 "%s - type->init() failed, err: %d\n",
1609                                 __func__, err);
1610                         return err;
1611                 }
1612         }
1613
1614         /* restart IO if needed */
1615         mutex_lock(&usbtouch->pm_mutex);
1616         if (usbtouch->is_open)
1617                 err = usb_submit_urb(usbtouch->irq, GFP_NOIO);
1618         mutex_unlock(&usbtouch->pm_mutex);
1619
1620         return err;
1621 }
1622
1623 static void usbtouch_free_buffers(struct usb_device *udev,
1624                                   struct usbtouch_usb *usbtouch)
1625 {
1626         usb_free_coherent(udev, usbtouch->data_size,
1627                           usbtouch->data, usbtouch->data_dma);
1628         kfree(usbtouch->buffer);
1629 }
1630
1631 static struct usb_endpoint_descriptor *
1632 usbtouch_get_input_endpoint(struct usb_host_interface *interface)
1633 {
1634         int i;
1635
1636         for (i = 0; i < interface->desc.bNumEndpoints; i++)
1637                 if (usb_endpoint_dir_in(&interface->endpoint[i].desc))
1638                         return &interface->endpoint[i].desc;
1639
1640         return NULL;
1641 }
1642
1643 static int usbtouch_probe(struct usb_interface *intf,
1644                           const struct usb_device_id *id)
1645 {
1646         struct usbtouch_usb *usbtouch;
1647         struct input_dev *input_dev;
1648         struct usb_endpoint_descriptor *endpoint;
1649         struct usb_device *udev = interface_to_usbdev(intf);
1650         struct usbtouch_device_info *type;
1651         int err = -ENOMEM;
1652
1653         /* some devices are ignored */
1654         if (id->driver_info == DEVTYPE_IGNORE)
1655                 return -ENODEV;
1656
1657         endpoint = usbtouch_get_input_endpoint(intf->cur_altsetting);
1658         if (!endpoint)
1659                 return -ENXIO;
1660
1661         usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
1662         input_dev = input_allocate_device();
1663         if (!usbtouch || !input_dev)
1664                 goto out_free;
1665
1666         mutex_init(&usbtouch->pm_mutex);
1667
1668         type = &usbtouch_dev_info[id->driver_info];
1669         usbtouch->type = type;
1670         if (!type->process_pkt)
1671                 type->process_pkt = usbtouch_process_pkt;
1672
1673         usbtouch->data_size = type->rept_size;
1674         if (type->get_pkt_len) {
1675                 /*
1676                  * When dealing with variable-length packets we should
1677                  * not request more than wMaxPacketSize bytes at once
1678                  * as we do not know if there is more data coming or
1679                  * we filled exactly wMaxPacketSize bytes and there is
1680                  * nothing else.
1681                  */
1682                 usbtouch->data_size = min(usbtouch->data_size,
1683                                           usb_endpoint_maxp(endpoint));
1684         }
1685
1686         usbtouch->data = usb_alloc_coherent(udev, usbtouch->data_size,
1687                                             GFP_KERNEL, &usbtouch->data_dma);
1688         if (!usbtouch->data)
1689                 goto out_free;
1690
1691         if (type->get_pkt_len) {
1692                 usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
1693                 if (!usbtouch->buffer)
1694                         goto out_free_buffers;
1695         }
1696
1697         usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
1698         if (!usbtouch->irq) {
1699                 dev_dbg(&intf->dev,
1700                         "%s - usb_alloc_urb failed: usbtouch->irq\n", __func__);
1701                 goto out_free_buffers;
1702         }
1703
1704         usbtouch->interface = intf;
1705         usbtouch->input = input_dev;
1706
1707         if (udev->manufacturer)
1708                 strlcpy(usbtouch->name, udev->manufacturer, sizeof(usbtouch->name));
1709
1710         if (udev->product) {
1711                 if (udev->manufacturer)
1712                         strlcat(usbtouch->name, " ", sizeof(usbtouch->name));
1713                 strlcat(usbtouch->name, udev->product, sizeof(usbtouch->name));
1714         }
1715
1716         if (!strlen(usbtouch->name))
1717                 snprintf(usbtouch->name, sizeof(usbtouch->name),
1718                         "USB Touchscreen %04x:%04x",
1719                          le16_to_cpu(udev->descriptor.idVendor),
1720                          le16_to_cpu(udev->descriptor.idProduct));
1721
1722         usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
1723         strlcat(usbtouch->phys, "/input0", sizeof(usbtouch->phys));
1724
1725         input_dev->name = usbtouch->name;
1726         input_dev->phys = usbtouch->phys;
1727         usb_to_input_id(udev, &input_dev->id);
1728         input_dev->dev.parent = &intf->dev;
1729
1730         input_set_drvdata(input_dev, usbtouch);
1731
1732         input_dev->open = usbtouch_open;
1733         input_dev->close = usbtouch_close;
1734
1735         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
1736         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
1737         input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
1738         input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
1739         if (type->max_press)
1740                 input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
1741                                      type->max_press, 0, 0);
1742
1743         if (usb_endpoint_type(endpoint) == USB_ENDPOINT_XFER_INT)
1744                 usb_fill_int_urb(usbtouch->irq, udev,
1745                          usb_rcvintpipe(udev, endpoint->bEndpointAddress),
1746                          usbtouch->data, usbtouch->data_size,
1747                          usbtouch_irq, usbtouch, endpoint->bInterval);
1748         else
1749                 usb_fill_bulk_urb(usbtouch->irq, udev,
1750                          usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
1751                          usbtouch->data, usbtouch->data_size,
1752                          usbtouch_irq, usbtouch);
1753
1754         usbtouch->irq->dev = udev;
1755         usbtouch->irq->transfer_dma = usbtouch->data_dma;
1756         usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1757
1758         /* device specific allocations */
1759         if (type->alloc) {
1760                 err = type->alloc(usbtouch);
1761                 if (err) {
1762                         dev_dbg(&intf->dev,
1763                                 "%s - type->alloc() failed, err: %d\n",
1764                                 __func__, err);
1765                         goto out_free_urb;
1766                 }
1767         }
1768
1769         /* device specific initialisation*/
1770         if (type->init) {
1771                 err = type->init(usbtouch);
1772                 if (err) {
1773                         dev_dbg(&intf->dev,
1774                                 "%s - type->init() failed, err: %d\n",
1775                                 __func__, err);
1776                         goto out_do_exit;
1777                 }
1778         }
1779
1780         err = input_register_device(usbtouch->input);
1781         if (err) {
1782                 dev_dbg(&intf->dev,
1783                         "%s - input_register_device failed, err: %d\n",
1784                         __func__, err);
1785                 goto out_do_exit;
1786         }
1787
1788         usb_set_intfdata(intf, usbtouch);
1789
1790         if (usbtouch->type->irq_always) {
1791                 /* this can't fail */
1792                 usb_autopm_get_interface(intf);
1793                 err = usb_submit_urb(usbtouch->irq, GFP_KERNEL);
1794                 if (err) {
1795                         usb_autopm_put_interface(intf);
1796                         dev_err(&intf->dev,
1797                                 "%s - usb_submit_urb failed with result: %d\n",
1798                                 __func__, err);
1799                         goto out_unregister_input;
1800                 }
1801         }
1802
1803         return 0;
1804
1805 out_unregister_input:
1806         input_unregister_device(input_dev);
1807         input_dev = NULL;
1808 out_do_exit:
1809         if (type->exit)
1810                 type->exit(usbtouch);
1811 out_free_urb:
1812         usb_free_urb(usbtouch->irq);
1813 out_free_buffers:
1814         usbtouch_free_buffers(udev, usbtouch);
1815 out_free:
1816         input_free_device(input_dev);
1817         kfree(usbtouch);
1818         return err;
1819 }
1820
1821 static void usbtouch_disconnect(struct usb_interface *intf)
1822 {
1823         struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1824
1825         if (!usbtouch)
1826                 return;
1827
1828         dev_dbg(&intf->dev,
1829                 "%s - usbtouch is initialized, cleaning up\n", __func__);
1830
1831         usb_set_intfdata(intf, NULL);
1832         /* this will stop IO via close */
1833         input_unregister_device(usbtouch->input);
1834         usb_free_urb(usbtouch->irq);
1835         if (usbtouch->type->exit)
1836                 usbtouch->type->exit(usbtouch);
1837         usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
1838         kfree(usbtouch);
1839 }
1840
1841 MODULE_DEVICE_TABLE(usb, usbtouch_devices);
1842
1843 static struct usb_driver usbtouch_driver = {
1844         .name           = "usbtouchscreen",
1845         .probe          = usbtouch_probe,
1846         .disconnect     = usbtouch_disconnect,
1847         .suspend        = usbtouch_suspend,
1848         .resume         = usbtouch_resume,
1849         .reset_resume   = usbtouch_reset_resume,
1850         .id_table       = usbtouch_devices,
1851         .supports_autosuspend = 1,
1852 };
1853
1854 module_usb_driver(usbtouch_driver);
1855
1856 MODULE_AUTHOR("Daniel Ritz <daniel.ritz@gmx.ch>");
1857 MODULE_DESCRIPTION("USB Touchscreen Driver");
1858 MODULE_LICENSE("GPL");
1859
1860 MODULE_ALIAS("touchkitusb");
1861 MODULE_ALIAS("itmtouch");
1862 MODULE_ALIAS("mtouchusb");