drivers/input/touchscreen/usbtouchscreen.c

   1 /******************************************************************************
   2  * usbtouchscreen.c
   3  * Driver for USB Touchscreens, supporting those devices:
   4  *  - eGalax Touchkit
   5  *    includes eTurboTouch CT-410/510/700
   6  *  - 3M/Microtouch  EX II series
   7  *  - ITM
   8  *  - PanJit TouchSet
   9  *  - eTurboTouch
  10  *  - Gunze AHL61
  11  *  - DMC TSC-10/25
  12  *
  13  * Copyright (C) 2004-2006 by Daniel Ritz <daniel.ritz@gmx.ch>
  14  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License as
  18  * published by the Free Software Foundation; either version 2 of the
  19  * License, or (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful, but
  22  * WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24  * General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  *
  30  * Driver is based on touchkitusb.c
  31  * - ITM parts are from itmtouch.c
  32  * - 3M parts are from mtouchusb.c
  33  * - PanJit parts are from an unmerged driver by Lanslott Gish
  34  * - DMC TSC 10/25 are from Holger Schurig, with ideas from an unmerged
  35  *   driver from Marius Vollmer
  36  *
  37  *****************************************************************************/
  38
  39 //#define DEBUG
  40
  41 #include <linux/kernel.h>
  42 #include <linux/slab.h>
  43 #include <linux/input.h>
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46 #include <linux/usb.h>
  47 #include <linux/usb/input.h>
  48
  49
  50 #define DRIVER_VERSION          "v0.5"
  51 #define DRIVER_AUTHOR           "Daniel Ritz <daniel.ritz@gmx.ch>"
  52 #define DRIVER_DESC             "USB Touchscreen Driver"
  53
  54 static int swap_xy;
  55 module_param(swap_xy, bool, 0644);
  56 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
  57
  58 /* device specifc data/functions */
  59 struct usbtouch_usb;
  60 struct usbtouch_device_info {
  61         int min_xc, max_xc;
  62         int min_yc, max_yc;
  63         int min_press, max_press;
  64         int rept_size;
  65         int flags;
  66
  67         void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
  68         int  (*get_pkt_len) (unsigned char *pkt, int len);
  69         int  (*read_data)   (struct usbtouch_usb *usbtouch, unsigned char *pkt);
  70         int  (*init)        (struct usbtouch_usb *usbtouch);
  71 };
  72
  73 #define USBTOUCH_FLG_BUFFER     0x01
  74
  75
  76 /* a usbtouch device */
  77 struct usbtouch_usb {
  78         unsigned char *data;
  79         dma_addr_t data_dma;
  80         unsigned char *buffer;
  81         int buf_len;
  82         struct urb *irq;
  83         struct usb_device *udev;
  84         struct input_dev *input;
  85         struct usbtouch_device_info *type;
  86         char name[128];
  87         char phys[64];
  88
  89         int x, y;
  90         int touch, press;
  91 };
  92
  93
  94 #if defined(CONFIG_USB_TOUCHSCREEN_EGALAX) || defined(CONFIG_USB_TOUCHSCREEN_ETURBO)
  95 #define MULTI_PACKET
  96 #endif
  97
  98 #ifdef MULTI_PACKET
  99 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
 100                                    unsigned char *pkt, int len);
 101 #endif
 102
 103 /* device types */
 104 enum {
 105         DEVTPYE_DUMMY = -1,
 106         DEVTYPE_EGALAX,
 107         DEVTYPE_PANJIT,
 108         DEVTYPE_3M,
 109         DEVTYPE_ITM,
 110         DEVTYPE_ETURBO,
 111         DEVTYPE_GUNZE,
 112         DEVTYPE_DMC_TSC10,
 113 };
 114
 115 static struct usb_device_id usbtouch_devices[] = {
 116 #ifdef CONFIG_USB_TOUCHSCREEN_EGALAX
 117         {USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
 118         {USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
 119         {USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
 120         {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
 121         {USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
 122         {USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
 123         {USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
 124 #endif
 125
 126 #ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
 127         {USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
 128         {USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
 129         {USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
 130         {USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
 131 #endif
 132
 133 #ifdef CONFIG_USB_TOUCHSCREEN_3M
 134         {USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
 135 #endif
 136
 137 #ifdef CONFIG_USB_TOUCHSCREEN_ITM
 138         {USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
 139 #endif
 140
 141 #ifdef CONFIG_USB_TOUCHSCREEN_ETURBO
 142         {USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
 143 #endif
 144
 145 #ifdef CONFIG_USB_TOUCHSCREEN_GUNZE
 146         {USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
 147 #endif
 148
 149 #ifdef CONFIG_USB_TOUCHSCREEN_DMC_TSC10
 150         {USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
 151 #endif
 152
 153         {}
 154 };
 155
 156
 157 /*****************************************************************************
 158  * eGalax part
 159  */
 160
 161 #ifdef CONFIG_USB_TOUCHSCREEN_EGALAX
 162
 163 #define EGALAX_PKT_TYPE_MASK            0xFE
 164 #define EGALAX_PKT_TYPE_REPT            0x80
 165 #define EGALAX_PKT_TYPE_DIAG            0x0A
 166
 167 static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 168 {
 169         if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
 170                 return 0;
 171
 172         dev->x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
 173         dev->y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
 174         dev->touch = pkt[0] & 0x01;
 175
 176         return 1;
 177 }
 178
 179 static int egalax_get_pkt_len(unsigned char *buf, int len)
 180 {
 181         switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
 182         case EGALAX_PKT_TYPE_REPT:
 183                 return 5;
 184
 185         case EGALAX_PKT_TYPE_DIAG:
 186                 if (len < 2)
 187                         return -1;
 188
 189                 return buf[1] + 2;
 190         }
 191
 192         return 0;
 193 }
 194 #endif
 195
 196
 197 /*****************************************************************************
 198  * PanJit Part
 199  */
 200 #ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
 201 static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 202 {
 203         dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
 204         dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
 205         dev->touch = pkt[0] & 0x01;
 206
 207         return 1;
 208 }
 209 #endif
 210
 211
 212 /*****************************************************************************
 213  * 3M/Microtouch Part
 214  */
 215 #ifdef CONFIG_USB_TOUCHSCREEN_3M
 216
 217 #define MTOUCHUSB_ASYNC_REPORT          1
 218 #define MTOUCHUSB_RESET                 7
 219 #define MTOUCHUSB_REQ_CTRLLR_ID         10
 220
 221 static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 222 {
 223         dev->x = (pkt[8] << 8) | pkt[7];
 224         dev->y = (pkt[10] << 8) | pkt[9];
 225         dev->touch = (pkt[2] & 0x40) ? 1 : 0;
 226
 227         return 1;
 228 }
 229
 230 static int mtouch_init(struct usbtouch_usb *usbtouch)
 231 {
 232         int ret, i;
 233
 234         ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
 235                               MTOUCHUSB_RESET,
 236                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 237                               1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
 238         dbg("%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d",
 239             __FUNCTION__, ret);
 240         if (ret < 0)
 241                 return ret;
 242         msleep(150);
 243
 244         for (i = 0; i < 3; i++) {
 245                 ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
 246                                       MTOUCHUSB_ASYNC_REPORT,
 247                                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 248                                       1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
 249                 dbg("%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d",
 250                     __FUNCTION__, ret);
 251                 if (ret >= 0)
 252                         break;
 253                 if (ret != -EPIPE)
 254                         return ret;
 255         }
 256
 257         return 0;
 258 }
 259 #endif
 260
 261
 262 /*****************************************************************************
 263  * ITM Part
 264  */
 265 #ifdef CONFIG_USB_TOUCHSCREEN_ITM
 266 static int itm_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 267 {
 268         int touch;
 269         /*
 270          * ITM devices report invalid x/y data if not touched.
 271          * if the screen was touched before but is not touched any more
 272          * report touch as 0 with the last valid x/y data once. then stop
 273          * reporting data until touched again.
 274          */
 275         dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
 276
 277         touch = ~pkt[7] & 0x20;
 278         if (!touch) {
 279                 if (dev->touch) {
 280                         dev->touch = 0;
 281                         return 1;
 282                 }
 283
 284                 return 0;
 285         }
 286
 287         dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
 288         dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
 289         dev->touch = touch;
 290
 291         return 1;
 292 }
 293 #endif
 294
 295
 296 /*****************************************************************************
 297  * eTurboTouch part
 298  */
 299 #ifdef CONFIG_USB_TOUCHSCREEN_ETURBO
 300 static int eturbo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 301 {
 302         unsigned int shift;
 303
 304         /* packets should start with sync */
 305         if (!(pkt[0] & 0x80))
 306                 return 0;
 307
 308         shift = (6 - (pkt[0] & 0x03));
 309         dev->x = ((pkt[3] << 7) | pkt[4]) >> shift;
 310         dev->y = ((pkt[1] << 7) | pkt[2]) >> shift;
 311         dev->touch = (pkt[0] & 0x10) ? 1 : 0;
 312
 313         return 1;
 314 }
 315
 316 static int eturbo_get_pkt_len(unsigned char *buf, int len)
 317 {
 318         if (buf[0] & 0x80)
 319                 return 5;
 320         if (buf[0] == 0x01)
 321                 return 3;
 322         return 0;
 323 }
 324 #endif
 325
 326
 327 /*****************************************************************************
 328  * Gunze part
 329  */
 330 #ifdef CONFIG_USB_TOUCHSCREEN_GUNZE
 331 static int gunze_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 332 {
 333         if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
 334                 return 0;
 335
 336         dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
 337         dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
 338         dev->touch = pkt[0] & 0x20;
 339
 340         return 1;
 341 }
 342 #endif
 343
 344 /*****************************************************************************
 345  * DMC TSC-10/25 Part
 346  *
 347  * Documentation about the controller and it's protocol can be found at
 348  *   http://www.dmccoltd.com/files/controler/tsc10usb_pi_e.pdf
 349  *   http://www.dmccoltd.com/files/controler/tsc25_usb_e.pdf
 350  */
 351 #ifdef CONFIG_USB_TOUCHSCREEN_DMC_TSC10
 352
 353 /* supported data rates. currently using 130 */
 354 #define TSC10_RATE_POINT        0x50
 355 #define TSC10_RATE_30           0x40
 356 #define TSC10_RATE_50           0x41
 357 #define TSC10_RATE_80           0x42
 358 #define TSC10_RATE_100          0x43
 359 #define TSC10_RATE_130          0x44
 360 #define TSC10_RATE_150          0x45
 361
 362 /* commands */
 363 #define TSC10_CMD_RESET         0x55
 364 #define TSC10_CMD_RATE          0x05
 365 #define TSC10_CMD_DATA1         0x01
 366
 367 static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
 368 {
 369         struct usb_device *dev = usbtouch->udev;
 370         int ret;
 371         unsigned char buf[2];
 372
 373         /* reset */
 374         buf[0] = buf[1] = 0xFF;
 375         ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
 376                               TSC10_CMD_RESET,
 377                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 378                               0, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
 379         if (ret < 0)
 380                 return ret;
 381         if (buf[0] != 0x06 || buf[1] != 0x00)
 382                 return -ENODEV;
 383
 384         /* set coordinate output rate */
 385         buf[0] = buf[1] = 0xFF;
 386         ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
 387                               TSC10_CMD_RATE,
 388                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 389                               TSC10_RATE_150, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
 390         if (ret < 0)
 391                 return ret;
 392         if (buf[0] != 0x06 || buf[1] != 0x00)
 393                 return -ENODEV;
 394
 395         /* start sending data */
 396         ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
 397                               TSC10_CMD_DATA1,
 398                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 399                               0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
 400         if (ret < 0)
 401                 return ret;
 402
 403         return 0;
 404 }
 405
 406
 407 static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
 408 {
 409         dev->x = ((pkt[2] & 0x03) << 8) | pkt[1];
 410         dev->y = ((pkt[4] & 0x03) << 8) | pkt[3];
 411         dev->touch = pkt[0] & 0x01;
 412
 413         return 1;
 414 }
 415 #endif
 416
 417
 418 /*****************************************************************************
 419  * the different device descriptors
 420  */
 421 static struct usbtouch_device_info usbtouch_dev_info[] = {
 422 #ifdef CONFIG_USB_TOUCHSCREEN_EGALAX
 423         [DEVTYPE_EGALAX] = {
 424                 .min_xc         = 0x0,
 425                 .max_xc         = 0x07ff,
 426                 .min_yc         = 0x0,
 427                 .max_yc         = 0x07ff,
 428                 .rept_size      = 16,
 429                 .flags          = USBTOUCH_FLG_BUFFER,
 430                 .process_pkt    = usbtouch_process_multi,
 431                 .get_pkt_len    = egalax_get_pkt_len,
 432                 .read_data      = egalax_read_data,
 433         },
 434 #endif
 435
 436 #ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
 437         [DEVTYPE_PANJIT] = {
 438                 .min_xc         = 0x0,
 439                 .max_xc         = 0x0fff,
 440                 .min_yc         = 0x0,
 441                 .max_yc         = 0x0fff,
 442                 .rept_size      = 8,
 443                 .read_data      = panjit_read_data,
 444         },
 445 #endif
 446
 447 #ifdef CONFIG_USB_TOUCHSCREEN_3M
 448         [DEVTYPE_3M] = {
 449                 .min_xc         = 0x0,
 450                 .max_xc         = 0x4000,
 451                 .min_yc         = 0x0,
 452                 .max_yc         = 0x4000,
 453                 .rept_size      = 11,
 454                 .read_data      = mtouch_read_data,
 455                 .init           = mtouch_init,
 456         },
 457 #endif
 458
 459 #ifdef CONFIG_USB_TOUCHSCREEN_ITM
 460         [DEVTYPE_ITM] = {
 461                 .min_xc         = 0x0,
 462                 .max_xc         = 0x0fff,
 463                 .min_yc         = 0x0,
 464                 .max_yc         = 0x0fff,
 465                 .max_press      = 0xff,
 466                 .rept_size      = 8,
 467                 .read_data      = itm_read_data,
 468         },
 469 #endif
 470
 471 #ifdef CONFIG_USB_TOUCHSCREEN_ETURBO
 472         [DEVTYPE_ETURBO] = {
 473                 .min_xc         = 0x0,
 474                 .max_xc         = 0x07ff,
 475                 .min_yc         = 0x0,
 476                 .max_yc         = 0x07ff,
 477                 .rept_size      = 8,
 478                 .flags          = USBTOUCH_FLG_BUFFER,
 479                 .process_pkt    = usbtouch_process_multi,
 480                 .get_pkt_len    = eturbo_get_pkt_len,
 481                 .read_data      = eturbo_read_data,
 482         },
 483 #endif
 484
 485 #ifdef CONFIG_USB_TOUCHSCREEN_GUNZE
 486         [DEVTYPE_GUNZE] = {
 487                 .min_xc         = 0x0,
 488                 .max_xc         = 0x0fff,
 489                 .min_yc         = 0x0,
 490                 .max_yc         = 0x0fff,
 491                 .rept_size      = 4,
 492                 .read_data      = gunze_read_data,
 493         },
 494 #endif
 495
 496 #ifdef CONFIG_USB_TOUCHSCREEN_DMC_TSC10
 497         [DEVTYPE_DMC_TSC10] = {
 498                 .min_xc         = 0x0,
 499                 .max_xc         = 0x03ff,
 500                 .min_yc         = 0x0,
 501                 .max_yc         = 0x03ff,
 502                 .rept_size      = 5,
 503                 .init           = dmc_tsc10_init,
 504                 .read_data      = dmc_tsc10_read_data,
 505         },
 506 #endif
 507 };
 508
 509
 510 /*****************************************************************************
 511  * Generic Part
 512  */
 513 static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
 514                                  unsigned char *pkt, int len)
 515 {
 516         struct usbtouch_device_info *type = usbtouch->type;
 517
 518         if (!type->read_data(usbtouch, pkt))
 519                         return;
 520
 521         input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);
 522
 523         if (swap_xy) {
 524                 input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
 525                 input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
 526         } else {
 527                 input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
 528                 input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
 529         }
 530         if (type->max_press)
 531                 input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
 532         input_sync(usbtouch->input);
 533 }
 534
 535
 536 #ifdef MULTI_PACKET
 537 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
 538                                    unsigned char *pkt, int len)
 539 {
 540         unsigned char *buffer;
 541         int pkt_len, pos, buf_len, tmp;
 542
 543         /* process buffer */
 544         if (unlikely(usbtouch->buf_len)) {
 545                 /* try to get size */
 546                 pkt_len = usbtouch->type->get_pkt_len(
 547                                 usbtouch->buffer, usbtouch->buf_len);
 548
 549                 /* drop? */
 550                 if (unlikely(!pkt_len))
 551                         goto out_flush_buf;
 552
 553                 /* need to append -pkt_len bytes before able to get size */
 554                 if (unlikely(pkt_len < 0)) {
 555                         int append = -pkt_len;
 556                         if (unlikely(append > len))
 557                                append = len;
 558                         if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
 559                                 goto out_flush_buf;
 560                         memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
 561                         usbtouch->buf_len += append;
 562
 563                         pkt_len = usbtouch->type->get_pkt_len(
 564                                         usbtouch->buffer, usbtouch->buf_len);
 565                         if (pkt_len < 0)
 566                                 return;
 567                 }
 568
 569                 /* append */
 570                 tmp = pkt_len - usbtouch->buf_len;
 571                 if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
 572                         goto out_flush_buf;
 573                 memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
 574                 usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);
 575
 576                 buffer = pkt + tmp;
 577                 buf_len = len - tmp;
 578         } else {
 579                 buffer = pkt;
 580                 buf_len = len;
 581         }
 582
 583         /* loop over the received packet, process */
 584         pos = 0;
 585         while (pos < buf_len) {
 586                 /* get packet len */
 587                 pkt_len = usbtouch->type->get_pkt_len(buffer + pos, len);
 588
 589                 /* unknown packet: drop everything */
 590                 if (unlikely(!pkt_len))
 591                         goto out_flush_buf;
 592
 593                 /* full packet: process */
 594                 if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
 595                         usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
 596                 } else {
 597                         /* incomplete packet: save in buffer */
 598                         memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
 599                         usbtouch->buf_len = buf_len - pos;
 600                         return;
 601                 }
 602                 pos += pkt_len;
 603         }
 604
 605 out_flush_buf:
 606         usbtouch->buf_len = 0;
 607         return;
 608 }
 609 #endif
 610
 611
 612 static void usbtouch_irq(struct urb *urb)
 613 {
 614         struct usbtouch_usb *usbtouch = urb->context;
 615         int retval;
 616
 617         switch (urb->status) {
 618         case 0:
 619                 /* success */
 620                 break;
 621         case -ETIME:
 622                 /* this urb is timing out */
 623                 dbg("%s - urb timed out - was the device unplugged?",
 624                     __FUNCTION__);
 625                 return;
 626         case -ECONNRESET:
 627         case -ENOENT:
 628         case -ESHUTDOWN:
 629                 /* this urb is terminated, clean up */
 630                 dbg("%s - urb shutting down with status: %d",
 631                     __FUNCTION__, urb->status);
 632                 return;
 633         default:
 634                 dbg("%s - nonzero urb status received: %d",
 635                     __FUNCTION__, urb->status);
 636                 goto exit;
 637         }
 638
 639         usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);
 640
 641 exit:
 642         retval = usb_submit_urb(urb, GFP_ATOMIC);
 643         if (retval)
 644                 err("%s - usb_submit_urb failed with result: %d",
 645                     __FUNCTION__, retval);
 646 }
 647
 648 static int usbtouch_open(struct input_dev *input)
 649 {
 650         struct usbtouch_usb *usbtouch = input_get_drvdata(input);
 651
 652         usbtouch->irq->dev = usbtouch->udev;
 653
 654         if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
 655                 return -EIO;
 656
 657         return 0;
 658 }
 659
 660 static void usbtouch_close(struct input_dev *input)
 661 {
 662         struct usbtouch_usb *usbtouch = input_get_drvdata(input);
 663
 664         usb_kill_urb(usbtouch->irq);
 665 }
 666
 667
 668 static void usbtouch_free_buffers(struct usb_device *udev,
 669                                   struct usbtouch_usb *usbtouch)
 670 {
 671         usb_buffer_free(udev, usbtouch->type->rept_size,
 672                         usbtouch->data, usbtouch->data_dma);
 673         kfree(usbtouch->buffer);
 674 }
 675
 676
 677 static int usbtouch_probe(struct usb_interface *intf,
 678                           const struct usb_device_id *id)
 679 {
 680         struct usbtouch_usb *usbtouch;
 681         struct input_dev *input_dev;
 682         struct usb_host_interface *interface;
 683         struct usb_endpoint_descriptor *endpoint;
 684         struct usb_device *udev = interface_to_usbdev(intf);
 685         struct usbtouch_device_info *type;
 686         int err = -ENOMEM;
 687
 688         interface = intf->cur_altsetting;
 689         endpoint = &interface->endpoint[0].desc;
 690
 691         usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
 692         input_dev = input_allocate_device();
 693         if (!usbtouch || !input_dev)
 694                 goto out_free;
 695
 696         type = &usbtouch_dev_info[id->driver_info];
 697         usbtouch->type = type;
 698         if (!type->process_pkt)
 699                 type->process_pkt = usbtouch_process_pkt;
 700
 701         usbtouch->data = usb_buffer_alloc(udev, type->rept_size,
 702                                           GFP_KERNEL, &usbtouch->data_dma);
 703         if (!usbtouch->data)
 704                 goto out_free;
 705
 706         if (type->flags & USBTOUCH_FLG_BUFFER) {
 707                 usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
 708                 if (!usbtouch->buffer)
 709                         goto out_free_buffers;
 710         }
 711
 712         usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
 713         if (!usbtouch->irq) {
 714                 dbg("%s - usb_alloc_urb failed: usbtouch->irq", __FUNCTION__);
 715                 goto out_free_buffers;
 716         }
 717
 718         usbtouch->udev = udev;
 719         usbtouch->input = input_dev;
 720
 721         if (udev->manufacturer)
 722                 strlcpy(usbtouch->name, udev->manufacturer, sizeof(usbtouch->name));
 723
 724         if (udev->product) {
 725                 if (udev->manufacturer)
 726                         strlcat(usbtouch->name, " ", sizeof(usbtouch->name));
 727                 strlcat(usbtouch->name, udev->product, sizeof(usbtouch->name));
 728         }
 729
 730         if (!strlen(usbtouch->name))
 731                 snprintf(usbtouch->name, sizeof(usbtouch->name),
 732                         "USB Touchscreen %04x:%04x",
 733                          le16_to_cpu(udev->descriptor.idVendor),
 734                          le16_to_cpu(udev->descriptor.idProduct));
 735
 736         usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
 737         strlcpy(usbtouch->phys, "/input0", sizeof(usbtouch->phys));
 738
 739         input_dev->name = usbtouch->name;
 740         input_dev->phys = usbtouch->phys;
 741         usb_to_input_id(udev, &input_dev->id);
 742         input_dev->dev.parent = &intf->dev;
 743
 744         input_set_drvdata(input_dev, usbtouch);
 745
 746         input_dev->open = usbtouch_open;
 747         input_dev->close = usbtouch_close;
 748
 749         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 750         input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 751         input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
 752         input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
 753         if (type->max_press)
 754                 input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
 755                                      type->max_press, 0, 0);
 756
 757         usb_fill_int_urb(usbtouch->irq, usbtouch->udev,
 758                          usb_rcvintpipe(usbtouch->udev, endpoint->bEndpointAddress),
 759                          usbtouch->data, type->rept_size,
 760                          usbtouch_irq, usbtouch, endpoint->bInterval);
 761
 762         usbtouch->irq->dev = usbtouch->udev;
 763         usbtouch->irq->transfer_dma = usbtouch->data_dma;
 764         usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 765
 766         /* device specific init */
 767         if (type->init) {
 768                 err = type->init(usbtouch);
 769                 if (err) {
 770                         dbg("%s - type->init() failed, err: %d", __FUNCTION__, err);
 771                         goto out_free_buffers;
 772                 }
 773         }
 774
 775         err = input_register_device(usbtouch->input);
 776         if (err) {
 777                 dbg("%s - input_register_device failed, err: %d", __FUNCTION__, err);
 778                 goto out_free_buffers;
 779         }
 780
 781         usb_set_intfdata(intf, usbtouch);
 782
 783         return 0;
 784
 785 out_free_buffers:
 786         usbtouch_free_buffers(udev, usbtouch);
 787 out_free:
 788         input_free_device(input_dev);
 789         kfree(usbtouch);
 790         return err;
 791 }
 792
 793 static void usbtouch_disconnect(struct usb_interface *intf)
 794 {
 795         struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
 796
 797         dbg("%s - called", __FUNCTION__);
 798
 799         if (!usbtouch)
 800                 return;
 801
 802         dbg("%s - usbtouch is initialized, cleaning up", __FUNCTION__);
 803         usb_set_intfdata(intf, NULL);
 804         usb_kill_urb(usbtouch->irq);
 805         input_unregister_device(usbtouch->input);
 806         usb_free_urb(usbtouch->irq);
 807         usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
 808         kfree(usbtouch);
 809 }
 810
 811 MODULE_DEVICE_TABLE(usb, usbtouch_devices);
 812
 813 static struct usb_driver usbtouch_driver = {
 814         .name           = "usbtouchscreen",
 815         .probe          = usbtouch_probe,
 816         .disconnect     = usbtouch_disconnect,
 817         .id_table       = usbtouch_devices,
 818 };
 819
 820 static int __init usbtouch_init(void)
 821 {
 822         return usb_register(&usbtouch_driver);
 823 }
 824
 825 static void __exit usbtouch_cleanup(void)
 826 {
 827         usb_deregister(&usbtouch_driver);
 828 }
 829
 830 module_init(usbtouch_init);
 831 module_exit(usbtouch_cleanup);
 832
 833 MODULE_AUTHOR(DRIVER_AUTHOR);
 834 MODULE_DESCRIPTION(DRIVER_DESC);
 835 MODULE_LICENSE("GPL");
 836
 837 MODULE_ALIAS("touchkitusb");
 838 MODULE_ALIAS("itmtouch");
 839 MODULE_ALIAS("mtouchusb");